Project Leaders:
Eduardo A. M. KOUTSOUKOS - PETROBRAS-CENPES/DIVEX/SEBIPE, Cidade Universitária,
Quadra 7, 21949-900 Rio de Janeiro, RJ, BRAZIL. Tel.: +55-(0)21-8656417
or 8656440, fax: 2803318, e-mail: koutsoukos@cenpes.petrobras.com.br
Peter BENGTSON - Geologisch-Paläontologisches Institut der Universität Heidelberg, Im Neuenheimer Feld 234, D-69120 Heidelberg, GERMANY. Tel.: +49-6221-548293, fax: 548640 or 545503, e-mail: Peter.Bengtson@urz.uni-heidelberg.de
"IGCP is interdisciplinary, covering all specialities of geology, geophysics and geochemistry. IGCP maintains active interfaces with disciplines related to the geological sciences such as marine sciences, atmospheric sciences and biological sciences."
Editor of SAMC News: E. A. M. Koutsoukos (Rio de Janeiro)
SAMC-Net An electronic mailing
list "SAMC-Net" through listserv@vm.urz.uni-heidelberg.de
is permanently available for on-line discussions among project participants.
Contacts and further information:
If you are interested in participating in SAMC please send the a letter
or e-mail to E. Koutsoukos, P. Bengtson or the SAMC Secretariat (addresses
below) giving name and full address, telephone, fax, e-mail address, main
research interests and, if you wish, a short account of current research
related to SAMC.
• Contacts and further information
• Regional Coordinators and National Nepresentatives for IGCP Project 381 (December 1999)
• IGCP Project 381 Thematic Working Groups and Chairmen
• South Atlantic Index Fossil Species: Systematics, Biostratigraphy and Palaeoecology
• SAMC - Thematic and Symposium
Volumes
• Proceedings of the Second Annual Conference
of IGCP Project 381 (SAMC II)
• Oil and Gas Habitats of the South
Atlantic
• Mesozoic Biogeographic Patterns in
the South Atlantric
• Mesozoic Palaeontology and Stratigraphy
of South America and the South Atlantic
• Petroleum Systems of the South Atlantic
Margins
• Forthcoming meetings of IGCP Project 381
:
• Réunion Regionalle du Project PICG
No. 381 - South Atlantic Mesozoic Correlations, held jointly with the 14
ème Colloque Africain de Micropaléontologie, 4 ème
Colloque de Stratigraphie et de Paléogéographie de l’Atlantique
Sud, et Réunion Annuelle sur l’Orogénie Kibarienne
- Project PIGC No. 418. Luanda, Angola, 21-24 May 2000
(Second Circular)
• Fifth Annual Conference of IGCP Project
381 (SAMC V),
to be held in conjunction with
the XXXIs International Geological
Congress (31st IGC)
- Symposium 1-3, Rio de Janeiro, 6-17 August 2000
• Reports of Research Activities (October
1998-September 1999)
• IGCP Project 381 research activities in
Brazil
• PETROBRAS Research
Centre (CENPES), Biostratigraphy and Palaeoecology Sector (SEBIPE), Rio
de Janeiro, Brazil
• Working Groups on
South Atlantic Evaporites and Regional Tectonics
• Universidade Federal
do Rio Grande do Sul (UFRGS), Curso de Pós-Graduação
em Geociências, Área de Estratigrafia, Convênio PETROBRAS/UFRGS
• Working Group on
Paleogeographic and paleoclimatic maps
• Research projects
related to IGCP Project 381 on Cretaceous Continental Ecosystems
• Federal University
of Paraná - UFPR
• Federal University
of Rio Grande do Sul - UFRGS
• Universidade do Vale do
Rio dos Sinos (UNISINOS), Programa de Pós-Graduação
em Geologia
• Universidad de la
Republica, Uruguay
• Research projects
at the National University of Rosario, Argentina.
• UNPSJB (Patagonia
University), Comodoro Rivadavia, Chubut. Argentina.
• Centro Austral
de Investigaciones Cientificas (CADIC), Ushuaia, Argentina
• IGCP Project
381 research activities in Ivory Coast
• IGCP Project 381 research activities in Cuba
• IGCP Project 381 research activities in the U.K.
• IGCP Project 381 research activities in Germany
• Changes of address and amendments
For English-speaking participants: Márcio R. MELO - PETROBRAS-CENPES, Cidade Universitária, Quadra 7, 21949-900 Rio de Janeiro, RJ, BRAZIL. Tel: +55-21-8656460, fax: 8656799, e-mail: marcio@cenpes.petrobras.com.br
Nick R. CAMERON (Correspondent Secretary) - Dept. of Geology, Royal School of Mines, Imperial College, Prince Consort Road, London SW7 2BP, UK. Tel.:/fax: +44-1494-776850 (NEW), e-mail: nick.cameron@ic.ac.uk or nick@topaz.primex.co.uk
For French-speaking participants: Mitsuru ARAI - PETROBRAS-CENPES, Cidade Universitária, Quadra 7, 21949-900 Rio de Janeiro, RJ, BRAZIL. Tel.: +55-21-8656452, fax: 8656795, e-mail: arai@cenpes.petrobras.com.br
Regional Coordinators and National Representatives for IGCP Project 381 (as of October 1999)
Responsible for liaison among participants, for disseminating information about the progress of the project and forthcoming meetings, for stimulating and coordinating research in their fields of expertise, and for reporting national research activities related to SAMC.
Angola: Mário Gil Pereira BRANDÃO - SONANGOL, P.O. Box 3506, 1000 Luanda, Angola. Tel.: +244 2 36-1681 (home), fax: +244 2 33-5426.
Argentina: Eduardo MUSACCHIO - Universidad Nacional de La Patagonia, Ciudad Universitaria km 4, 9000 Comodoro Rivadavia, Chubut, ARGENTINA. Tel./Fax: +54-97-550339, e-mail: aldo@unpbib.edu.ar
Eduardo B. OLIVERO - Centro Austral de Investigaciones Científicas (CADIC), Av. Malvinas Argentinas s/n , C.C. 92, 9410 Ushuaia, Tierra del Fuego, ARGENTINA. Tel.: +54-901-22 310/312/314, fax: 30644, e-mail: eolivero@ satlink.com
Brazil: Eduardo A. M. KOUTSOUKOS - PETROBRAS-CENPES, Cidade Universitária, 21949-900 Rio de Janeiro, RJ, BRAZIL. Tel. +55-21-8656417 or 8656440, Fax: 2803318, e-mail: koutsoukos@cenpes.petrobras.com.br
Peter SZATMARI - PETROBRAS-CENPES/Divex, Cidade Universitária, 21949-900 Rio de Janeiro, RJ, BRAZIL. Tel.: +55-21-8656435, fax: 8656792
Cuba: Jorge R. SANCHEZ-ARANGO - Centro de Investigaciones del Petróleo (CEINPET), Washington No. 169, Esquina a Churruca - Cerro, La Habana 1200, CUBA. Tel.: +53-7- 408900, 411132, fax: +53-7- 333072, 338027
Egypt: Mohamed I.A. IBRAHIM - Faculty of Science, Dept. of Environmental Sciences, Alexandria University, Moharram Bay 21511, Alexandria, EGYPT. (Current address: Department of Geology, Faculty of Science, University of Qatar, P.O. Box 2713, Doha, Qatar, E-mail: M.Ibrahim@qu.edu.qa)
France: Edwige MASURE (Correspondante Française pour le PICG 381) - Laboratoire de Micropaleontologie, Département de Géologie Sédimentaire, URA 1761, Université P. & M. CURIE, 4 PLACE Jussieu, 75252 Paris Cedex 05, FRANCE. Tél. : +33- 44 27 49 87, fax. +33- 44 27 38 31, e-mail: edmasure@ccr.jussieu.fr
Ivan de KLASZ - "La Verdiane", 74 Av. du Mont Alban, F-06300 Nice, FRANCE. Tel./fax: +33-493-268843.
Germany: Peter BENGTSON - Geologisch-Paläontologisches Institut der Universität Heidelberg,, D-69120 Heidelberg, GERMANY. Tel.: +49-6221-548293, fax: 548640/545503, e-mail: Peter.Bengtson@urz.uni-heidelberg.de
Ghana: Lawrence APAALSE - Ghana National Petroleum Corporation (GNPC), PMB, Tema, GHANA. Tel.: +233 21 712930, fax: +233 21 712916, e-mail: gnpcexplo@ncs.com.gh
Ivory Coast: Zeli Bruno DIGBEHI - Université de Cocody, UFR des Sciences de la Terre et des Ressources Minières, 22 BP 582 Abidjan 22, CÔTE D’IVOIRE - Tel: 225 44 29 34(office) 225 37 44 09 (home), 225 73 36 96 ( personal cell.), e-mail: digbehz@ci.refer.org
Mexico: Maria Ornelas SANCHEZ - Instituto Mexicano del Petróleo - Exploración, Eje Central Lázaro Cardenas No. 152, Col. San Bartolo Atepehuacan, Mexico D.F. 07730, MEXICO. Tel.: 5 3685911, fax: 3689336.
Niger: Madame Kadi ALZOUMA (Représentante de la section nigérienne du Project PICG No. 381) Département de Géologie, Université Abdou Moumouni de Niamey, BP 10662 Niamey, NIGER. Tel.: 227 733072, fax: 733072.
Senegal: Ricardo GOMEZ (National Representative) - Department of Geology, Faculty of Sciences and Technics, University Cheikh Anta Diop of Dakar, BP. Dakar-Fann, SENEGAL. Tel : (221) 825.04.43 poste 1186; fax : (221) 824.63.18. e-mail : ricardo@ucad.sn
Sweden: Joen WIDMARK - Marine Geology, Earth Science Centre, Göteborg University, 41381 Göteborg, SWEDEN. Tel.+46-31-773 44 70, fax: 773 49 03, e-mail: joen@marine-geology.gu.se
United Kingdom: Kenneth Thomson (UK national correspondent) - Department of Geological Sciences, University of Durham, Durham DH1 3LE, UK. Tel.: +44-191-374-4784, fax: 374-2510, e-mail: Kenneth.Thomson@durham.ac.uk
Alistair CRAME - British Antarctic Survey, Madingley Road, Cambridge CB3 0ET, UK. Tel.: +44-1223-251443, fax: 62616, e-mail: jacr@pcmail.nerc-bas.ac.uk
U.S.A. : Thomas W. DIGNES - Mobil Technology Company, Mobil Exploration & Producing Technical Center, P. O. Box 650232, Dallas, TX 75265-0232, USA. E-mail: tom_w_dignes@email.mobil.com
Venezuela: Francia A. GALEA-ALVAREZ - CORPOVEN S.A., filial of
P.D.V.S.A., Laboratorio Geológico, Apartado Postal 4326, Puerto
La Cruz 692, VENEZUELA. Tel.: +58-81-606429, fax: +58-81-606445.
The following thematic Working Groups reflect the diversity of geological understanding and needs within the Project area:
• Aptian/Albian and Albian/Cenomanian Stage Boundaries: E. Koutsoukos
• Cenomanian/Turonian and Turonian/Coniacian Stage Boundaries: P. Bengtson
• Coniacian/Santonian, Santonian/Campanian and Campanian/ Maastrichtian Stage Boundaries: Eduardo Olivero (CADIC, Ushuaia, Argentina)
• Atlas of Cretaceous Carbonate Microfacies: D. Dias-Brito (IGCE-UNESP, Brazil)
• Chemostratigraphic Correlations: René Rodriques (PETROBRAS- CENPES)
• Cretaceous Continental Ecosystems: Ismar Carvalho (UFRJ, Rio de Janeiro, Brazil)
• Dating of the First Marine Transgression: E. Koutsoukos
• K/T Boundary: E. Koutsoukos
• Biochronostratigraphy and Biogeography of Non-Marine Microfossil Assemblages: E. Musacchio (Universidad Nacional de la Patagonia, Comodoro Rivadavia, Argentina)
• Paleogeographical and Paleoclimatical Maps: Antonio J. Vasconcellos Garcia (UNISINOS) and Biostratigraphic Group of PETROBRAS-CENPES
• South Atlantic Evaporites: Peter Szatmari (PETROBRAS-CENPES)
• Regional Tectonics: P. Szatmari
• Biochronostratigraphic Framework for the Mesozoic Successions: biostratigraphic groups of EXXON and PETROBRAS-CENPES.
For additional information please contact the WGs' chairmen.
Systematics, Biostratigraphy and Palaeoecology
This is a long-term research programme initiated by IGCP Project 381 comprising several research working-groups on the various types of index fossils on both sides of the South Atlantic. Each WG should have a co-leader on each side of the ocean, who would, in addition to contributing, coordinate the collecting and publishing of data. The final aim would be, among others, the publishing of iconographic atlases of index fossils for the various basins. This would made possible the establishment of an integrated stratigraphic scale. The following WG's have been set:
• Mesozoic ostracodes
Coordinator for West Africa: Jean-Paul Colin - (ESSO Rep., Bègles) and Ray Bate (Lacustrine Basin Research, London)
Coordinators for South America: E. Musacchio (Universidad Nacional de La Patagonia, Comodoro Rivadavia) and Marta Cláudia Viviers and Jarbas V. P. Guzzo (PETROBRAS-CENPES)
• Mesozoic [benthic] foraminifers
Coordinator for West Africa: Ivan de Klasz (Nice)
Coordinators for South America: E. A. M. Koutsoukos and M. C. Viviers (PETROBRAS)
• Mesozoic [planktic] foraminifers
Coordinator for West Africa: Jean-Pierre Bellier (Université Pierre et Marie Curie)
Coordinator for Latin America: José Longoria (Florida International University)
• Ammonites
Coordinators: Peter Bengtson (Heidelberg University) and Eduardo Olivero (CADIC, Ushuaia)
• Inoceramids
Coordinators: Gregorio Lópes (Universitat Autònoma de Barcelona)
• Calcareous nannofosils
Coordinators: Luis C. V. Oliveira and Rogério L. Antunes (PETROBRAS)
• Palynomorphs
Coordinators for West Africa: Chris Denison (CHEVRON) and Mohamed Ibrahim (Alexandria University)
Coordinators for South America: Rodolfo Dino and Mitsuru Arai (PETROBRAS)
As a contribution to the aims of SAMC Thematic Volumes and Proceedings of project meetings have been published and are being edited with collections of papers addressing specific issues within the framework of IGCP Project 381:
• Proceedings of the Second Annual Conference of IGCP Project
381 (SAMC II), held in conjunction with the 13th Colloquium
of African Micropalaeontology and the 3rd Colloquium on the Stratigraphy
and Palaeogeography of the South Atlantic, Yaoundé, Cameroon, 8-13
March 1997. A collection of papers has been published as a Special
Issue of Africa Geoscience Review, Vol. 4, Nos. 3 & 4, 1997.
• The Oil and Gas Habitats of the South Atlantic
(eds.: N.R. Cameron, R.H. Bate and V.S. Clure), Geological Society Special
Publication No. 153, 474 pp., London (July 1999).
Geological Society Publishing House, Unit 7 Brassmill Enterprise Centre,
Brassmill Lane, Bath BA1 3JN, UK (Tel: 01225 445046. Fax: 01225 442836)
The book may be ordered from the on-line bookshop: http://bookshop.geolsoc.org.uk
This Symposium Volume, published as a contribution to IGCP Project
381, contains the papers presented at the meeting held at the Geological
Society, London, 24-26 February 1997.
Cameron, N. R., Bate, R. H., Clure, V. S. & Benton, J. Oil and gas habitats of the South Atlantic: Introduction.
The geological and geophysical framework
Karner, G. D. & Driscoll, N. W. Tectonic and stratigraphic
development of the West African and eastern Brazilian Margins: insights
from quantitative basin modelling.
Gallagher, K. & Brown, R. The Mesozoic denudation history
of the Atlantic margin of southern Africa and southeast Brazil and the
relationship to offshore sedimentation.
Darros de Matos, R. M. History of the northeast Brazilian rift
system: kinetic implications for the break-up between Brazil and West Africa.
Rosendahl, B. R. & Groschell-Becker, H. Deep seismic structure
of the continental margin in the Gulf of Guinea: a summary report.
Crossley, R. & Cripps, D. Templates from mainland Africa
and the Red Sea foor interpreting the early evolution of the South Atlantic.
Oil and gas habitats
Dolan, P. Western Africa: an unfinished story of oil and
gas exploration
Coward, M. P., Purdy, E. G., Ries, A. C. & Smith, D. G. The
distribution of petroleum reserves in basins of the South Atlantic margins.
Davison, I. Tectonics and hydrocarbon distribution along the
Brazilian South Atlantic margin.
Jungslager, E. H. A. Petroleum habitats of the Atlantic margin
of South Africa.
Organic geochemistry
Schiefellbein, C. F. Zumberge, J. E. Cameron, N. R. & Brown, S.
W. Petroleum systems in the South Atlantic margins.
Burwood, R. Angola: source rock control for Lower Congo Coastal
and Kwanza Basin petroleum systems.
Applications
Holbourn, A., Kuhnt, W., El Albani, A., Pletsch, T. Luderer F. &
Wagner, T. Upper Cretaceous palaeoenvironments and benthonic foraminiferal
assemblages of potential source rocks from the western African margin,
Central Atlantic.
El Albani, A., Kuhnt, W., Luderer, F., Herbin, J. P. & Caron, M.
Palaeoenvironmental evolution of the Late Cretaceous sequence in the Tarfaya
Basin (southwest of Marrocco).
Wagner, T. & Pletsch, T. Tectono-sedimentary controls on
Cretaceous back shale deposition along the opening of the Equatorial Atlantic
Gateway (ODP Leg 159).
Preece, R. C., Kaminski, M. A. & Dignes, T. W. Miocene benthonic
foraminiferal morphogroups in an oxygen minimum zone, offshore Cabinda.
Bate, R. H. Non-marine ostracod assemblages of the Pre-Salt rift
basins of West Africa and their role in sequence stratigraphy.
Dingle, R. V. Walvis Ridge barrier: its influence on palaeoenvironments
and source rock generation deduced from ostracod distributions in the early
South Atlantic Ocean.
Exploration studies and issues
Turner, J. P. Detachment faulting and petroleum prospectivity
in the RioMuni Basin, Equatorial Guinea, West Africa.
Bagguley, J. & Prosser, S. The interpretation of passive
margin depositional processes using seismic stratigraphy: examples from
offshore Namibia.
Stanistreet, I. G. & Stollhofen, H. Onshore equivalents of
the main Kudu gas reservoir in Namibia
Jerram, D. A., Mountneyy, N & Stollhofen, H. Facies architecture
of the Etjo Sandstone Formation and its interaction with the Basal Etendeka
Flood Basalts of northwest Namibia: implications for offshore prospectivity.
Clemson, J., Cartwright, J. & Swart, R. The Namib Rift: a
rift system of possible Karoo age, offshore Namibia.
Barker, P. F. Falkland Plateau evolution and a mobile southernmost
South America.
Lawrence, S. R., Johnson, M., Tubb, S. R. & Marshallsea, S. J.
Tectono-stratigraphic evolution of the North Falkland region.
Bransden, P. J. E., Burges, P., Durham, M. J. & Hall, J. G.
Evidence for multi-phase rifting in the North Falklands Basin
Meadows, N. S. Basin evolution and sedimentary fill in the Palaeozoic
sequences of the Falkland Islands.
• Mesozoic Biogeographical Patterns in the South Atlantic
(eds.: Eduardo A. M. Koutsoukos, Peter Bengtson, Ivan de Klasz and
David Batten), to be published as a double Special Issue of Cretaceous
Research (vol. 21/1-2), with publication anticipated during March
or at the beginning of April 2000.
• Mesozoic Palaeontology and Stratigraphy of South America
and the South Atlantic (eds.: Eduardo A. M. Koutsoukos
and Peter Bengtson), to be published as a thematic issue of the Journal
of South American Earth Sciences. Proceedings of the 2nd European Meeting
on the Palaeontology and Stratigraphy of South America and the Regional
Meeting of IGCP 381 “South Atlantic Mesozoic Correlations”, 2-4 September
1997, Heidelberg, Germany.
• Petroleum Systems of the South Atlantic Margins
(eds.: M.R. Mello and B.J. Katz), to be published as an AAPG Memoir, will
comprise contributions from the AAPG/ABGP Joint Hedberg Research Symposium
on Petroleum Systems of the South Atlantic Margins, held 16-19 November
1997 in Rio de Janeiro.
www.netangola.com/geoluanda2000
E-mail: geo.luanda2000@netangola.com
In association with these, two other additional events will take place: the IGCP Project 418 (Evolution of the Kibaran selt) First Annual Meeting, and a Regional Meeting of IGCP Project 381 (South Atlantic Mesozoic Correlations). Inaugurated in 1963 at Dakar (Senegal) these meetings have been held every two or three years. They have allowed the presentation and discussion of major geological works and scientific researchs concerning the stratigraphy of Africa and the South Atlantic. After previous meetings organised in Angers (France, 1994) and Yaoundé (Cameroun, 1997), Luanda (Angola) is scheduled to host this set of geoscientific meetings from May 21 to 24, 2000.
The meetings will be an opportunity for an interaction
between research and industry, enabling the exchange of ideas to improve
reasearch, development and investment of human and Earth resources in the
African continent. It will in particular be an ocasion for African geoscientists
to open their scientific perspectives for the next century. The primary
focus will be on the Opening of the South Atlantic, supported by different
approches such as geology of ocean basins, paleontology, stratigraphy,
paleogeography, tectonics, and geophysics.
Abstracts should be typed on a 13 cm x 20 cm size using Times 10 point regular font; ident the first line of each paragraph 0.5 mm, single space and laser printer. The title should be in bold and alignment centered. The manuscript should be no longer than 2 pages, incuding balck and white figures and essential references.
Oral speakers will have 15 minutes for the presentation of the paper, followed by five minutes for questions and answers. The Theme Keynote Speaker will have 50 minutes for presentation of their paper. The audio-visual facilities will inclue two 35 mm (2”x2”) carousel slide projector and one overhead projector.
Poster presentations will take place close to the main lecture
hall and refreshment areas. Each display consisting of maps, diagrams,
photographs, etc., should be 129 cm x 106 cm in size. delegates should
bring their own adhesives/pins.
The official language of the meetings and presentations will
be English.
THEME A: MACRO AND MICROPALAEONTOLOGY AND CORRELATION.
(organisms in sedimentation)
A1. Carboniferous-Jurassic.
A2. Cretaceous.
A3. Tertiary.
A4. Quaternary.
THEME B: STRATIGRAPHY AND PALAEONTOLOGY AND SEDIMENTATION.
B1. Marine Sedimentation: Clastic and Carbonate.
B1.1.
Siliciclastic depositional system.
B1.1.1. Shoreline, nearshore and shelf sediments.
B1.1.2. Deep and turbiditic sediments.
B.1.2.
Mixed sediment.
B.1.3.
Carbonate depositional system.
B.1.3.1. Shelf and platform carbonates and evaporites.
B.1.3.2. Slope and basin carbonates.
B2. Non-marine Sedimentation.
B2.1.
Lacustrine sedimentation.
B2.2.
Fluvial sedimentation.
B3. Sedimentary Basins and Geodynamics.
B3.1.
Continental margins: modern and ancient.
B3.2.
Basin modeling.
B3.3.
Geophysics.
B3.4.
Geochemistry.
B4. Sedimentary Processes in Relation to Global
Change.
B4.1.
Cyclic sequences: high and low requencies.
B4.2.
Magnetostratigraphy and sedimentary palaeomagmatism.
B4.3.
Marine anoxic events.
B5. Volcanogenic Processes and sediments.
B5.1.
Subaereal volcaniclastic processes and products.
B5.2.
Subaqueous volcaniclastic processes and products.
B5.3.
Facies models of volcaniclastic sedimentation.
B.5.4.
Tectonic settings of volcaniclastic sediments.
B.6. Diagenesis and Sedimentary Geochemistry.
B6.1.
Carbonate diagenesis.
B6.2.
Diagenesis in sandstone sequences.
B6.3.
Evaporite diagenesis.
B6.4.
Physical and chemical processes.
B6.5.
Chronology of diagenetic events.
THEME C: SPECIAL TECHNIQUES.*
C1. Quaternary Geology.
C2. Hydrogeology.
C3. Environmental Geology.
C4. Geological Education.
C5. History of Geosciences.
C6. Mathematical Geology and Geoinformatics.
THEME D: SEDIMENTATION OF THE SOUTH ATLANTIC HYDROCARBON PROVINCE
AND COMPARISONS.**
D1. Reservoir Modelling in Developed
Fields.
D2. Basin Modelling, Provennce, Fluid
Flow and Diagenesis.
THEME E: PRECAMBRIAN GEOLOGY AND PETROLOGY.
E1. Regional Geology.
E2. Structural Geology and Geotectonics.
E3. Geochemistry and Isotope Geology.
E4. Igneous and Metamorphic Petrology.
E5. Geology of Mineral Deposits.
*/** add themes
Conference Proceedings.
The Proceedings of the Conference will be published in two issues:
Volume I: Abstract Volume. - This will be provided at registration.
Volume II: This will cover all papers by the Conference participants
who submitted their papers by the firt day of the Conference, Monday 22
May, 2000. These papers will be published in special publications of the
AFRICA GEOSCIENCE REVIEW.
Participants
before
after
GSA* and AAG** members
150
200
Non-members
300
350
Accompanying Member
200
75
Students
50
75
(* Geological Society of Africa/ ** Angolan Association of Geologists)
All payments must be made by bank draft transfer in US dollars payable
to GeoLuanda 2000. Credit cards are not acceptable.
Bank Transfers should be addressed to: Account Name: GeoLuanda
2000
Account Number: 0965/005859/002 Code: SWIFT: ”ILBKAOLU”
Bank: Banco Português do Atlântico (Sucursal
de Luanda - Angola)
Refund of fees can be made until 29 February 2000. No refunds will
be made after 31 March 2000, and there will be a non-refundable service
fee of US$50.
Note that rooms will only be guaranteed once deposit payment has been received. If you are sharing a Double Room please provide the name of the person with whom you are sharing.
B) This field trip will cover the Mesozoic to Cenozoic geological
history of central Kwanzabasin. Luanda-Cabo Ledo-Sumbe-Luanda
(3 days/ 2 nights)
Start: 18 May, 7h30, from Luanda to Cabo Ledo (overnight)
African night in Cabo Ledo with “sea gastronomy”
19 May, 7h30, Cabo Ledo to Sumbe
Transport: 4 X 4 Climate: Good
Required field gear: Boots, long shirt and trousers. Difficult
grade: Low
Cost: 300*/600** US$ Return: 20 May, 17h00,
Luanda
Field leaders: I. Sgrosso, A. Buta Neto, M.L. Putignano and A.
Baldiceda
Max. participants: 22
- Luanda-Lubango-Kunene-Luanda (4 days/3 nights)
Start: 25 May, 7h30, from Luanda to Lubango.
Transport: Plane and 4 X 4 Climate: Good
Required field gear: Boots, long shirt and trousers. Difficult
grade: Medium
Cost: 450*/900** US$ Return: 28 May, 17h00,
Luanda
Field leaders: E. Morais, S. Sinigoi Max. participants:
22
D) This field trip focuses on the facies and tectonic sedimentary evolution of the Cretaceous and Tertiary depositional systems in the Benguela province along with the formation of the continental sedimentary basin (Angola Rift). The trip will visit the spectacular contact of the Upper Cretaceous and Eocene deposits (Kwanza Basin).
- Luanda-Benguela-Luanda (4 days/3 nights)
Start: 25 May, 7h30, from Luanda to Benguela.
Transport: Plane and 4 X 4 Climate: Good
Required field gear: Boots, long shirt and trousers. Difficult
grade: Medium
Cost: 400*/800** US$ Return: 28 May, 17h00,
Luanda
Field leaders: M.L. Morais, I. Sgrosso Max. participants:
22
E1. Theme: Mussulo Peninsula - Transitional beach and lagoonal
facies. (1 day)
Start: 23 May, 9h00 Transport: Boat Climate:
Good
Required field gear: Light wear, bathing suit. Difficult
grade: Very low
Cost: 30 US$ Return: 17h00 of the same day
Field leader: Cristhian Seyve Max. participants:
15
E2. Barra do Dande Picnic. (1 day)
Cost: 30 US$
E3. Sightseeing (Slavery and Anthropology Museums).
(1 day)
Cost: 30 US$
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The 5th Annual Conference of IGCP Project 381 (SAMC V) will be held in Rio de Janeiro, Brazil, in conjuntion with the XXXIs International Geological Congress (31st IGC) - Symposium 1-3, 6-17 August 2000.
Conveners: E.A.M. Koutsoukos and P. Bengtson
All Abstracts will be published in a series of Abstract Volumes, and
included in a CD-ROM to be distributed to all participants.
For further details please contact :
31st International Geological Congress
Secretariat Bureau - Casa Brazil 2000
Av. Pasteur, 404 - Anexo 31 IGC - Urca, 22290-240 Rio de Janeiro,
RJ, BRAZIL
Tel.: +55-(0)21-295 5847, fax: 295 8094, e-mail:
31igc@org.br
See also the 31st IGC Home-Page at: http://www.31igc.org
IGCP PROJECT 381 RESEARCH ACTIVITIES IN BRAZIL
Reported by Eduardo A. M. Koutsoukos (Co-leader of IGCP Project 381
and national representative for Brazil) - PETROBRAS-CENPES/SEBIPE,
21949-900 Rio de Janeiro, RJ, Brazil.
(e-mail: koutsoukos@cenpes.petrobras.com.br)
PETROBRAS Research Centre (CENPES)
Biostratigraphy and Palaeocology Section (SEBIPE), Rio de Janeiro,
Brazil.
Reported by E. A. M. Koutsoukos
Collaborators:
Luzia Antonioli
Mitsuru Arai
Rodolfo Dino
Luiz Carlos Veiga de Oliveira
René Rodrigues
Research Projects in progress:
The following research projects are carried out within the scope of
IGCP Project 381:
• High-resolution event stratigraphy, depositional history and palaeoceanography
of the Cretaceous-Tertiary boundary in South America.
Coordinated by E.A.M. Koutsoukos (foraminifera)- Research programme
(long-term).
Detailed lithostratigraphic, geochemic, micro- and macropalaeontologic
integrated studies to characterise the sequence of events (stratigraphic,
palaeoceanographic and palaeobiologic) across the Cretaceous-Tertiary (K/T)
boundary in South America. On-site field and laboratory work.
A ongoing joint research with Peter Bengtson (ammonites), Gerson Fauth
(ostracodes) and Peter Schlicht (magnetostratigraphy) - University of Heidelberg,
Alexandre A. Grassi and Francisco Henrique O. Lima (calcareous nannofossils)
- UFRGS/PETROBRAS, Maria de Fátima R. Sarkis (dinoflagellates) -
UFRJ, Carla Cristina Campos (spores and pollens) - USP/University Guarulhos,
and René Rodrigues (stable isototope stratigraphy) - PETROBRAS-CENPES.
Publications:
GRASSI, A. A. & DE ROS, L.F., 1999. Tektites ascribed to the Chicxulub
low angle ejecta at the Cretaceous-Tertiary boundary of the Campos Basin,
Brazil. Presented at the 5th Simposium on the Brazilian Cretaceous, Serra
Negra, SP, Brazil, August/September 1999.
Summary: A core from an oil-well drilled in the 70’s in the Campos
Basin, offshore southeastern Brazil, recovered a succession apparently
continuous across the Cretaceous-Tertiary boundary (KTB), including a 2.5
cm thick layer of spherules interpreted as tektites directly ascribed to
KTB event itself. This layer occurs within a 90 cm thick, greenish gray
interval from which just few calcareous nannofossils were recovered. The
rocks below and above this interval are siltites which respectively contain
the uppermost Maastrichtian Micula prinsii Zone, and the lowermost Paleocene
Thoracosphaera acme and Neobiscutum romeinii Zone, indicating a complete
succession, and probably a continuous deposition across the KTB. The lack
of nannofossils recovery through the greenish gray interval is due to a
strong cementation and replacement of the host rock by pyrite and calcite,
which compositional (non-ferroan, non-magnesian), textural (microcrystalline,
corroding siliciclastic grains, within horizontal expansion microveins),
and isotopic (d13CPDB ? -40‰) aspects suggest a precipitation related to
methane oxidation at the sulfate-reduction zone, close to the sea-bottom.
The tektites are dark-gray to black, subspherical, with 0.3 to 1.4 mm of
diameter. They were also extensively replaced by calcite and pyrite, but
several of them display internal features suggesting flow and devitrification
textures of the original glass, which is preserved as minor inclusions
in only a few tektites, as shown by polarizing microscopy, electronic microscopy
and microprobe analyses, what characterize them as the most distant known
record of low angle ejecta from the Chicxulub impact structure (? 7.800
km).
• Integrated stratigraphy, palaeogeography and palaeoclimatology
of the Cretaceous of northeastern Brazil.
Coordinated by E.A.M. Koutsoukos & P. Bengtson - Research
programme (long-term).
Two major objectives emerge within the general framework of the research
programme: (i) Refined integrated study of biozonal schemes, chemo- and
magnetostratigraphy for the Cretaceous sedimentary sequences in northeastern
Brazil. Precise characterisation of bio- and chronostratigraphic boundaries,
thereby enhancing interbasinal and intercontinental stratigraphic correlation.
(ii) Reconstruction of the palaeogeographic, palaeoceanographic and palaeoclimatologic
history of the northern South Atlantic during the Cretaceous.
A joint research programme with Armando Scarparo Cunha (calcareous
nannofossils) - UFRGS/PETROBRAS-CENPES, Rodolfo Dino (palynology) - PETROBRAS-CENPES,
Luzia Antonioli (palynology) - UFRJ/PETROBRAS-CENPES, Mitsuru Arai
(palynology) - PETROBRAS-CENPES, Cecília Cunha Lana (palynology)
- PETROBRAS-CENPES, Laureen Sally da Rosa Alves (paleobotany) - UFRGS,
among others.
• Upper Cretaceous ostracodes assemblages of Central Cuba.
(CEINPET-SEBIPE joint research project)
Coordinated by Maria Lizette Diaz-Collell(1), Marta Claudia Viviers(2),
Jorge R. Sánchez-Arango(1)
(1) Centro de Investigaciones del Petróleo (CEINPET), La Havana,
Cuba.
(2) PETROBRAS-CENPES/DIVEX/SEBIPE, Rio de Janeiro, Brazil
Taxonomic and biostratigraphic studies of the ostracodes assemblages
recovered from Upper Cretaceous carbonate deposits (Via Blanca, Eloisa,
Cantabria and Jimaguayu formations) of Central Cuba.
• Palynochronostratigraphic calibration of Lower Cretaceous successions
from NE Brazil.
Coordinated by Rodolfo Dino (PETROBRAS-CENPES), in collaboration with
Jean Dejax (Museum National d'Histoire Naturelle, Paris) and Mohamed I.
Ibrahim (Alexandria University, Egypt).
Publications :
The following publications are contributions to IGCP Project 381:
ALVES, L.S.R. & KOUTSOUKOS, E.A.M., 1998. Fossil woods of the Serraria
Formation (Upper Jurassic-Lower Cretaceous), Sergipe
Basin, NE Brazil: morpho-anatomic study and paleoclimatic assessment. XL
Congresso Brasileiro de Geologia (Belo Horizonte, 11-16 October 1998),
Anais, 448, Belo Horizonte, SBG-MG.
ALVES, L.S.R. & KOUTSOUKOS, E.A.M., 1998. Fossil Gymnospermae of
the Serraria Formation (Upper Jurassic-Lower Cretaceous), Sergipe Basin,
NE Brazil: preliminary paleoclimatic inferences. Third Annual Conference
of IGCP Project 381 (SAMC III) (Comodoro Rivadavia, 17-20 November 1998),
Asociación Paleontológica del Golfo San Jorge, Boletín
2 (Edición especial), 1.
Antonioli, L., Rodrigues, M. A. C. & Dino, R., 1998. Late Aptian-early
Albian palynomorphs of the Ceará basin - NE -Brazil. 31st Annual
Meeting of AASP, that will take place in Ensenada, Baja California, Mexico
(27-31 October 1998), Abstracts.
ARAI, M., 1999. The mid-Cretaceous marine transgression: Its implication
for the paradigm of the Cretaceous paleogeographic reconstruction of Brazil.
In: DIAS BRITO, D., CASTRO, J.C. & ROHN, R. (eds), Boletim do V Simpósio
sobre o Cretáceo do Brasil & I Simposio sobre el Cretácico
de América del Sur (Serra Negra-SP, 29/08-02/09/99), pp. 577-582.
ARAI, M. & CARVALHO, I.S., 1999. Conchostráceos da Formação
Maceió, Cretáceo Inferior da Bacia de Alagoas, Nordeste do
Brasil. Boletim de Resumos do 16º Congresso Brasileiro de Paleontologia
(Crato, CE), pp. 19-20.
ARAI, M., PEREIRA, M.J. & SHIMABUKURO, S., 1998. Origem dos Chapadões
Brasileiros: uma análise à luz da estratigrafia de seqüências.
XL Congresso Brasileiro de Geologia (Belo Horizonte, 11-16 October 1998),
Anais, Belo Horizonte, SBG-MG.
ARAI, M. & KOUTSOUKOS, E.A.M., 1998. Palynoforaminifera (foraminiferal
organic linings and allied material): a new tool for petroleum exploration.
AAPG Int. Conf. (Rio de Janeiro, Brazil, 8-11/11/98) Pap., AAPG Bull. Vol.
82, No. 10, Oct. 1998 (ISSN 0149-1423).
ARAI, M., BOTELHO NETO, J., LANA, C.C. & PEDRÃO, E., 1998.
Biogeographic differentiation and provincialism of Cretaceous dinoflagellates
in Brazilian basins and the Atlantic Ocean. Third Annual Conference of
IGCP Project 381 (SAMC III) (Comodoro Rivadavia, 17-20 November 1998),
Asociación Paleontológica del Golfo San Jorge, Boletín
2 (Edición especial), 4.
Azambuja Filho, N.C., Azevedo, R.M.L., Rodrigues, R. & Koutsoukos,
E.A.M., 1998. An integrated approach using cyclostratigraphy, stable isotopes
and paleoecology as a high resolution technique for deep-water reservoirs.
AAPG Int. Conf. (Rio de Janeiro, Brazil, 8-11/11/98), AAPG Bull. Vol. 82,
No. 10, p. 1888, Oct. 1998 (ISSN 0149-1423).
AZEVEDO, R.L.W., 1999. The Albian stage, its stratigraphic units, and
age limits on the Brazilian coastal basins. In: DIAS BRITO, D., CASTRO,
J.C. & ROHN, R. (eds), Boletim do V Simpósio sobre o Cretáceo
do Brasil & I Simposio sobre el Cretácico de América
del Sur (Serra Negra-SP, 29/08-02/09/99), pp. 637-642.
CASTRO, J.C., DIAS-BRITTO, D., MUSACCHIO, E.A., SUAREZ, J., MARANHÃO,
M.S.A.S. & RODRIGUES, R., 1999. Stratigraphic framework of Bauru Group
in west São Paulo, In: DIAS BRITO, D., CASTRO, J.C. & ROHN,
R. (eds), Boletim do V Simpósio sobre o Cretáceo do Brasil
& I Simposio sobre el Cretácico de América del Sur (Serra
Negra-SP, 29/08-02/09/99), pp. 509-515.
CUNHA, A. A. S., 1999. Orbital cyclicity in the Turonian succession
of the Sergipe basin, NE Brazilian continental margin, In: DIAS BRITO,
D., CASTRO, J.C. & ROHN, R. (eds), Boletim do V Simpósio sobre
o Cretáceo do Brasil & I Simposio sobre el Cretácico
de América del Sur (Serra Negra-SP, 29/08-02/09/99), pp. 669-673.
DINO, R., 1998. Aptian to lower Albian pollen and spores assemblages
from the Potiguar Basin - NE Brazil. 31st Annual Meeting of AASP, that
will take place in Ensenada, Baja California, Mexico (27-31 October 1998),
Abstracts.
DINO, R., SILVA, O.B. & ABRAHÃO, D., 1999. Palynological
and stratigraphic characterization of the Cretaceous strata from the Alter
do Chão Formation, Amazonas Basin. In: DIAS BRITO, D., CASTRO, J.C.
& ROHN, R. (eds), Boletim do V Simpósio sobre o Cretáceo
do Brasil & I Simposio sobre el Cretácico de América
del Sur (Serra Negra-SP, 29/08-02/09/99), pp. 557-565.
GUZZO, J.V.P. & ARIENTI, L.M., 1998. Depositional Significance
of Lacustrine Black Shales: Falsifying a Paradigm. AAPG Int. Conf. (Rio
de Janeiro, Brazil, 8-11/11/98), AAPG Bull. Vol. 82, No. 10, Oct. 1998
(ISSN 0149-1423).
Koutsoukos, E.A.M., 1998. An extraterrestrial impact in the early Danian:
a secondary K/T boundary event ? TERRA-Nova. Vol. 10, pp. 68-73.
Koutsoukos, E.A.M., 1998 The Guembelitria-Woodringina-Chiloguembelina
lineage (Foraminiferida) in the lower Danian of the Poty section, Pernambuco,
NE Brazil: radiation patterns. XL Congresso Brasileiro de Geologia
(Belo Horizonte, 11-16 October 1998), Anais, 453, Belo Horizonte, SBG-MG.
Koutsoukos, E.A.M., 1998. The lower Turonian succession in northeastern
Brazil: foraminiferal and environmental changes.Third Annual Conference
of IGCP Project 381 (SAMC III) (Comodoro Rivadavia, 17-20 November 1998),
Asociación Paleontológica del Golfo San Jorge, Boletín
2 (Edición especial), 17.
KOUTSOUKOS, E.A.M., 1999. Distribution patterns of morphotypes and
pelagic niches of planktonic foraminifers in the cretaceous of NE Brazil.
In: DIAS BRITO, D., CASTRO, J.C. & ROHN, R. (eds), Boletim do V Simpósio
sobre o Cretáceo do Brasil & I Simposio sobre el Cretácico
de América del Sur (Serra Negra-SP, 29/08-02/09/99), pp. 675-680.
KOUTSOUKOS, E.A.M., 1999. Microbiostratigraphic record and paleoenvironmental
evolution of the early marine deposits in the Brazilian margin - a review.
In: DIAS BRITO, D., CASTRO, J.C. & ROHN, R. (eds), Boletim do V Simpósio
sobre o Cretáceo do Brasil & I Simposio sobre el Cretácico
de América del Sur (Serra Negra-SP, 29/08-02/09/99), pp. 599-603.
LANA, C.C. & Carvalho, I.S., 1998. Cretaceous esthereniid conchostraceans
from Potiguar Basin (Northeastern Brazil): relationships with Western African
conchostracofaunas and paleoecological inferences. Third Annual Conference
of IGCP Project 381 (SAMC III) (Comodoro Rivadavia, 17-20 November 1998),
Asociación Paleontológica del Golfo San Jorge, Boletín
2 (Edición especial), 17.
Lana, C.C. & Roesner, E.H., 1998. Palinologia do Cretáceo
Superior marinho subaflorante na região de Natal, RN. Anais da Academia
Brasileira de Ciências (Seção de 2/10/98), Resumos,
Rio de Janeiro.
OLIVEIRA, L.C.V. & RODRIGUES, R., 1999. Biostratigraphy (nannofossils)
and chemostratigraphy of the upper Campanian-lower Maastrichtrian in Carapeba
Field, Campos Basin, Brazil. In: DIAS BRITO, D., CASTRO, J.C. & ROHN,
R. (eds), Boletim do V Simpósio sobre o Cretáceo do Brasil
& I Simposio sobre el Cretácico de América del Sur (Serra
Negra-SP, 29/08-02/09/99), pp. 131-135.
SCHLICHT, P., BENGTSON, P., HAMBACH, U., KRUMSIEK, K. & KOUTSOUKOS,
E.A.M., 1999. Limestone-marl cycles from the Maastrichtian of the Petrnambuco-Paraíba
Basin (NE Brazil) - evidence for orbital forcing? In: DIAS BRITO,
D., CASTRO, J.C. & ROHN, R. (eds), Boletim do V Simpósio sobre
o Cretáceo do Brasil & I Simposio sobre el Cretácico
de América del Sur (Serra Negra-SP, 29/08-02/09/99),
pp. 121-124.
Schlicht, P., Koutsoukos, E. A. M., Bengtson, P. & Krumsiek, K.,
1998. Magnetic properties of Maastrichtian to Paleocene sediments from
the Pernambuco-Paraiba Basin (NE Brazil): preliminary results. Third Annual
Conference of IGCP Project 381 (SAMC III) (Comodoro Rivadavia, 17-20 November
1998), Asociación Paleontológica del Golfo San Jorge,
Boletín 2 (Edición especial), 29-30.
Viviers, M. C., Koutsoukos, E. A. M., Silva-Telles Jr., A. C. &
Bengtson, P., 1998. Late Aptian-Maastrichtian ostracodes from the Potiguar
and Sergipe Basins (NE Brazil) and biogeographic affinities. Third Annual
Conference of IGCP Project 381 (SAMC III) (Comodoro Rivadavia, 17-20 November
1998), Asociación Paleontológica del Golfo San Jorge,
Boletín 2 (Edición especial), 35-37.
WOOD, G. D., MILLER, M. A., POCKNALL, D. T., ALEMAN,
A. M., STEIN, J. A. & DINO, R., 1998. Paleoclimatologic, paleoecologic
and biostratigraphic significance of the middle Cretaceous elaborate microfloral
province, Gondwana. AAPG RIO98 Conference (Rio de Janeiro, 8-11 November,
1998), Extended Abstracts.
Newsletters of IGCP Project 381 (SAMC News):
Koutsoukos, E.A.M. (Editor), SAMC News 11 (October 1998). IGCP
(UNESCO/IUGS) Project 381, South Atlantic Mesozoic Correlations, Newsletter,
42 pp. (ISSN 1413-6813).
Koutsoukos, E.A.M. (Editor), SAMC News 12 (December 1998). IGCP
(UNESCO/IUGS) Project 381, South Atlantic Mesozoic Correlations, Newsletter,
49 pp. (ISSN 1413-6813).
Koutsoukos, E.A.M. (Editor), SAMC News 13 (June 1999). IGCP (UNESCO/IUGS)
Project 381, South Atlantic Mesozoic Correlations, Newsletter, 29 pp.
(ISSN 1413-6813).
Koutsoukos, E.A.M. (Editor), SAMC News 14 (October 1999). IGCP
(UNESCO/IUGS) Project 381, South Atlantic Mesozoic Correlations, Newsletter,
48 pp. (ISSN 1413-6813).
(In Press)
Koutsoukos, E.A.M., "Rhabdammmina-type" foraminiferal assemblages in
the Cretaceous of Northeastern Brazil. Grzybowski Foundation Special
Publication, London.
Koutsoukos, E.A.M., Cretaceous foraminifers, environmental gradients
and stratigraphic sequences: a case-study of NE Brazil. Cushman Foundation
Theme Session “Applied Integrated Stratigraphy in Exploration and Development
Geology: New Techniques and Perspectives”, 1999 GSA Annual Meeting, Denver,
Colorado (October 25-28, 1999).
Koutsoukos, E.A.M. & FAUTH, G., Stratigraphic record and depositional
dynamics of an impact-triggered tsunami event in the Early Danian: the
K/T boundary sequence at Poty, NE Brazil. Theme Session, 1999 GSA
Annual Meeting, Denver, Colorado (October 25-28, 1999).
Koutsoukos, E.A.M. & de KLASZ, I., Late Cretaceous Foraminiferida
biogeography (Families Bolivinidae, Buliminellidae, Gavelinellidae, Siphogenerinoididae,
Turrilinidae) in low latitude Atlantic regions: nortrheastern Brazilian
shelf and central West African basins. In: Koutsoukos, E.A.M., Bengtson,
P., de Klasz, I. & Batten, D.J. (Eds), Mesozoic Biogeographical Patterns
in the South Atlantic (IGCP Project 381 Thematic Issue), Cretaceous Research,
Special Issue.
VIVIERS, M.C., KOUTSOUKOS, E.A.M., SILVA-TELLES Jr., A.C. & BENGTSON,
P., Stratigraphy and biogeographic affinities of the late Aptian-Campanian
ostracods of the Potiguar and Sergipe basins in northeastern Brazil.
In: Koutsoukos, E.A.M., Bengtson, P., de Klasz, I. & Batten, D.J. (Eds),
Mesozoic Biogeographical Patterns in the South Atlantic (IGCP Project 381
Thematic Issue), Cretaceous Research, Special Issue.
Dissertations and thesis:
In Progress:
ANTONIOLI, L., Palyno-Chronostratigraphic Study of the Codó
Formation, northern Brazilian, Lower Cretaceous. Doctorate Thesis, Federal
University of Rio de Janeiro.
This research is being developed with the support of PETROBRAS-CENPES/DIVEX/
SEBIPE. As an initial contribution, a more refined study in the Codó
region was carried out. The partial results of this study (Palynoestratigraphic
Analysis of Aptian Deposits of the Parnaíba Basin, in the Codó
Region - MA) were presented at the Brazilian Paleontologic Congress
held in Crato-Ceará, August 2-6, 1999. Palynostratigraphic analysis
were carried out on outcrop and well sections drilled by Fábrica
de Cimento Nassau, (Well 22/20 - UTM: 609829,34W / 9.499.391,71S), Itapecuru
Agro-Indústria S/A, located near the Codó town. The
studied material corresponds, in lithostratigraphic terms, to deposits
of the Codó Formation - Parnaíba Basin, which covers an extensive
area with discontinuous outcrops, in the north of the Maranhão and
Piauí states. In the studied locality it was possible to characterize,
three main units belonging the Codó Formation with distinct sedimentologic
features: a) the lower unit - siliciclastics, composite for dark gray to
black shales and the fluvial and aeolian, sandstones and dolostones; b)
intermediate unit - carbonatic, composite by carbonates, gypsum and anhydrite,
interbedded with dark siltstones and shales; c) the upper unit - dominantly
sliciclastics carbonatic, arenaceous, interbedded with siltstones, shales
and carbonates. Twelve samples had been collected, being four cores and
five outcrop representative samples. A rich, diversified and well-preserved
palynologica assemblage was recovered, with a very important guide-taxa
content as Sergipea variverrucata, associated with attributable dinoflagellates
related to the genus Caningia in the uppermost portion of the section.
Besides that, there are common reworking of Devonian age material as indicated
by the spores and acritarchs species, such as Emphanisporites rotatus,
Maranhites brasiliensis, and Tasmanites spp. The Cretaceous assemblage
is clearly correlated which the palynozones well recorded in the Brazilian
marginal basins, and assigns these deposiots to the Sergipea variverrucata
(P-270) palinozone, of late Aptian age. Evidence supplied by the lithology
and the palynologic assemblage in the region suggests a fluvial-deltaic-lacustrine
continental system environment, for the basal unit, merging to a marine
to coastal environment in its intermediate portions, culminating with a
shallow marine deposits towards the top of the Codó Formation.
The quantitative and qualitative palynologic study
has already been carried out on approximately 30 % of all the selected
material.
AZEVEDO, R.L.M., Estratigrafia e paleoceanografia do Cretáceo
médio marinho, da margem continental sudeste/leste do Brasil: uma
abordagem holística. Doctorate Thesis, Federal University of Rio
Grande do Sul (UFRGS), Instituto de Geociências, Porto Alegre
(RS).
CUNHA, A.A.S., Cicloestratigrafia e Paleoceanografia do Cenomaniano-Turoniano
do Atlântico Sul. Doctorate Thesis, Federal University of Rio Grande
do Sul (UFRGS), Instituto de Geociências, Porto Alegre (RS).
MILHOMEN, P., Integrated stratigraphic analysis of the Aratu
Stage in the Araçás Oil Field, Recôncavo Basin, Bahia,
Brazil. M.Sc. dissertation, Federal University of Rio Grande do Sul
(UFRGS), Instituto de Geociências, Porto Alegre (RS).
Working Groups on South Atlantic Evaporites and Regional Tectonics
Reported by Peter Szatmari (Chairman and Regional Coordinator)
PETROBRAS-CENPES, Rio de Janeiro, Brazil.
(e-mail: szatmari@cenpes.petrobras.com.br)
In 1999, work has continued on the study of continental breakup tectonics.
A paper, based on the talk presented at the AAPG Hedberg conference on
the South Atlantic in 1997 (Szatmari, P., 1997, Tectonic habitat of petroleum
along the South Atlantic margins. AAPG/ABGP Joint Hedberg Research Symposium
"Petroleum Systems of the South Atlantic Margins" Nov. 16-19, 1997, Rio
de Janeiro, Brazil), has been prepared for the AAPG Memoir on the subject,
edited by Marcio Rocha Mello and Barry Katz. The book is in its final stages
of preparation. Other publications related to this working group include:
Publications:
Szatmari, P., in press. Continental breakup and early evolution of
the South Atlantic. IGC-2000
Smith, P., Evensen, N., York, D., Szatmari, P., Conceição,
J.C.J. & Destro, N., 1999. Getting it on track: Ar-Ar geochronology
of alkali intrusions of the Serra do Mar province, Brazil. AGU Annual Mtg.,
1999.
Lobo, J. T., Valente, S.C., Thomaz Filho, Al. & Szatmari, P., 1999,
Modelamento geoquímico quantitativo dos processos evolutivos dos
basaltos do Cretáceo Inferior da bacia de Campos, SE do Brasil.
V Cong. Geoquim dos paises de lingua portuguesa; VII Cong Bras Geoquim.,
SBGq Salvador 1999.
Mohriak, W.U. & Peter Szatmari, P., 1999, Deep-water salt tectonics
and sedimentation: insights from seismic interpretation and physical models.
ARAGÃO, M.A.N.F. , COSTA, I.P., SILVA, O.B. & SZATMARI,
P., 1999, Influência de esforços compressivos na arquitetura
do rifte Recôncavo/Tucano/Jatobá e no controle tectônico
de algumas acumulações de petróleo. 7. Simp. Nac.
Estudos Tectônicos, Lençois, Bahia (11-15 May 1999), Brazil,
Ext.. Abstract.
Demercian, L.S. & Szatmari, P., 1999, Thin-skinned gravitational
transfer zone in the southern part of Santos Basin. 6th Int. Cong. of the
Brazilian Geophysical Society (SBGF), Rio de Janeiro, Ext. Abs., 4 p.
Szatmari, P., 1999. Role of tectonic and halotectonic processes in
shaping the Brazilian continental margin. 7. Simp. Nac. Estudos Tectônicos,
Lençois, Bahia (11-15 May 1999), Brazil, Ext. Abstract.
The geological department of the Universidade Federal do Rio Grande do Sul (UFRGS), in Porto Alegre, southermost Brazil, carry out research work of strong relevance to IGCP Project 381, mainly at the M.Sc. and Doctorate level, under the supervision of PETROBRAS.
The following M.Sc. dissertations and Doctorate Theses are related to
SAMC:
Research in progress:
• Estudo estratigráfico integrado de alta resolução
do Campaniano-Maastrichtiano da bacia de Pernambuco-Paraíba: evolução
paleoceanográfica.
Francisco Henrique O. Lima - M.Sc. Dissertation.
Supervisor: Eduardo A. Koutsoukos
• Correlação Tectono-Sedimentar entre as Bacias de Camamu
e Recôncavo -BA Durante o Tempo Rio da Serra/Jiquiá.
José Antônio Cupertino - Doctorate Thesis.
Supervisors: Peter Szatmari and Farid Chemale Jr.
• Organofácies e Palinologia Aplicada à Estratigrafia
de Seqüências da Fm. Morro do Chaves (Aptiano) da Bacia de Sergipe/Alagoas.
Gilberto Inácio Henz - Doctorate Thesis.
Supervisors: Nilo Chagas de Azambuja Filho and Luis Antônio
Freitas Trindade
• Estratigrafia de Eventos na Dinâmica Gondwânica Durante
o EoCretáceo.
Gilmar Vital Bueno - Doctorate Thesis.
Supervisors: Peter Szatmari and Farid Chemale Jr.
• Estratigrafia e paleoceanografia do Cretáceo médio
marinho, da margem continental sudeste/leste do Brasil: uma abordagem holística.
Ricardo Latgé Milward de Azevedo - Doctorate
Thesis.
Supervisors: Renê Rodrigues and Dimas Dias-Brito
• Cicloestratigrafia e Paleoceanografia do Cenomaniano-Turoniano do
Atlântico Sul.
Armando Antônio Scarparo Cunha - Doctorate
Thesis.
Supervisors: Eduardo A. Koutsoukos and Nilo Chagas de Azambuja
Filho
• A Aplicação de Métodos Geocronológicos,
Geotérmicos e Paragenéticos no Desenvolvimento de Modelos
Diagenéticos de Três Reservatórios Clásticos
Brasileiros.
Andréia R. D. Elias - Doctorate Thesis.
Supervisor: Luiz Fernando De Ros
• O limite Cretáceo-Terciário nas bacias de Pernambuco-Paraíba
e Campos: um estudo multidisciplinar.
Alexandre de Azevedo Grassi - M.Sc. Dissertation.
Supervisor: Eduardo A. M. Koutsoukos and Luiz
Fernando De Ros
• Petrologia e Características de Reservatórios
dos Arenitos Mucuri (Andar Alagoas – Bacia do Espírito Santo) no
Contexto da Estratigrafia de Seqüências.
Luciana Moreira Félix - M.Sc. Dissertation.
Supervisor: Luis Fernando De Ros
• Modelagem Sedimentar Aplicada a Plataforma Carbonática Mista.
José Eduardo Faccion - M.Sc. Dissertation.
Supervisors: Nilo Chagas de Azambuja Filho and Christopher
St. G. Kendall
• Análise Estratigráfica do Andar Aratu na Bacia do Recôncavo
sob o Enfoque da Estratigrafia de Seqüências.
Paulo da Silva Milhomem - M.Sc. Dissertation.
Supervisor: Nilo Chagas de Azambuja Filho
• Análise Litofaciológica e Cronoestratigráfica
da Fm. Botucatu na Porção Meridional do Estado de Santa Catarina.
Fernanda Guilardi da Silva - M.Sc. Dissertation.
Supervisors: Ênio Soliani Jr. and Claiton Marlon
Santos Scherer
Working
Group on Paleogeographic and paleoclimatic maps
Coordinator: Antonio Jorge Vasconcellos Garcia (e-mail: garcia@euler.unisinos.br)
Main research focus on :
• Paleogeographical and Provenance analysis
• Regional Paleoclimatic analsysis
• Lithofacioplogic architecture and diagenetic
processes controls on reservoir/ aquifer porosity
• Basin Evolution controls on mineral resources
and hydrocarbon potential
Paleogeographic and provenance studies associated to paleontological,
diagenetic and paleoclimatic analysis are contributing to improve the understanding
of the South Atlantic Marginal and Interior Basin evolution during the
Mesozoic.
Regional basin studies conduced by several research groups,
participants of the "South Atlantic Mesozoic Correlation Project ˆ SAMC/IGCP
381", will be the main data bases to construct paleomaps containing geological
information representing source areas; continental, transitional and marine
lithofacies; volcanic events and ancient climate conditions, important
to determine the favorable environmental condition to origin of petroleum
source rocks and reservoir.
Ongoing Activities :
We are in contact with Dr. Alfred Ziegler, coordinator of the "Paleogeographic
Atlas Project" at the University of Chicago, to use the same base paleogeographic
maps to plot the data produced by the participants of the SAMC Project.
At the discussions in Serra Negra and thereafter we decided
to propose a Thematic Volume entitled "Paleogeographic and paleoclimatic
Evolution of the Mesozoic South atlantic", to be edited within the framework
of IGCP Project 381. This will comprise a collection of contributions from
the WG participants, and be published through a major journal.
To make easier the compilation of data from the available
literature and ongoing research, the regional studies will be organized
provisionally in four main regions: 1. South America Intracontinental basins;
2. Eastern South America and Western Africa Coastal Atlantic basins (Tethyan
to Boreal realms); 3. Southeastern South America and South Africa Atlantic
basins (Boreal Realm); 4. Northern South America, Caribbean and Northwestern
African Atlantic basins (Tethyan Realm).
Suggested time intervals for the production of the maps,
which are of key-importance in the evolutionary history of the Mesozoic
Gondwana breakup and South Atlantic development: Ladinian, Carnian, Norian,
Rhaetian, Toarcian, Kimmeridgian, Tithonian, Valaginian, Barremian, Aptian,
Albian, Cenomanian-Turonian, Coniacian-Santonian, Campanian-Maastrichtian.
The base paleogeographic maps would be made available
accordingly the needs of the contributors of the WG/Thematic Volume.
Federal University of Paraná - UFPR
Reported by Robson Tadeu Bolzon (e-mail: olzonrt@setuva.geologia.ufpr.br)
Research Project:
Silicified woods of the Mesozoic of Rio Grande do Sul State,
Brazil.
Participant: Robson Tadeu Bolzon - UFPR
Report.
Silicified woods have been found in fluvial sandstones of Mesozoic
age (Triassic or Jurassic) in the Rio Grande do Sul State, Brazil.
Specimens were collected systematically. Analyses on growth rings, morphology
and mineralogy are being made.
Federal University of Rio Grande do Sul - UFRGS
Collaborators:
Laureen Sally da Rosa Alves (e-mail:
laureen@if.ufrgs.br)
Luiz Fernando De Ros (e-mail: lfderos@if.ufrgs.br)
Margot Guerra Sommer
Research Project #1:
• Growth rings in fossil woods as a toll for paleoclimatic assessment
of Paleozoic and Mesozoic sequences in the Paraná Basin.
Participants: Laureen Sally of Rosa Alves and Margot Guerra Sommer
The abundance and excellent preservation of petrified wood in different
stratigraphic sequences of the Paraná Basin allows the assessment
of paleoclimatic inferences for the depositional setting (Bolzon, 1993,
Alves, 1994). The analysis of growth rings of the morphogenus
Barakaroxylon (Surange and Maithy) Kulkarni, Maithy and Surange, 1970,
recovered from deposits of the Irati Formation (Permian), allowed to infer
the presence of very marked seasonal cycles with little climatic variations
between consecutive years. The structure of the growth rings suggests a
hot and relatively dry climate, similar to a present-day Mediterranean
type.
Studies of Mesozoic wood woods from southern Brazil (Rio Grande do
Sul State) allow the identification of growth rings in the secondary xylem
of Gymnospermae specimens, which are characterized as false growth rings
(Bolzon, 1994; Soares et al., 1998). Based on the presence
of these structures a hot and seasonally humid climate has been inferred
for the Triassic sequences of southern Brazil.
Therefore, detailed dendrologic analyses of fossil woods allow to characterize
the paleoclimatic evolutionary changes which marked the Permo-Triassic
transition in the Paraná Basin helping also to establish the
regional characteristics of the climate in the study areas.
Research Project #2 :
• Fossil woods of the Serraria Formation (Upper Jurassic-Lower Cretaceous),
Sergipe Basin, NE Brazil: morpho-anatomic study and paleoclimatic assessment.
Participants: Laureen Sally of Rosa Alves, Margot Guerra Sommer and
Eduardo A. M. Koutsoukos
Fossil woods are been commonly recovered from the fluvial sandstone
deposits of the Serraria Formation, but no morpho-anatomic analyses has
been carried out to date. The associated occurrence of non-marine ostracodes
assigns a Late Jurassic-Early Cretaceous age for the deposits.
The studied specimens were collected from two different
outcrop localities in the vicinities of Malhada dos Bois, in northwestern
Sergipe. This work presents the initial results of a detailed morpho-anatomic
study and a preliminary paleoclimatic assessment of the environmental setting,
also suggesting a fossilization process by petrification or silicification
of the woody tissues.
Research Project #3:
• Fossil woods in the Itapecuru Formation (Albian-Cenomanian?),
São Luis Basin, Maranhão.
Participants: Laureen Sally of Rosa Alves, Margot Guerra Sommer and
Eduardo A. M. Koutsoukos
This work presents a preliminary assement of silicified wood specimens recovered from conglomeratic sandstones of the Itapecuru Formation (Albian-Cenomanian ?, São Luis Basin), in the Cajual Island, São Luis, Maranhão. Analysis of the specimens reveals a good preservation of the morpho-anatomic structures needed for identification. The joint occurrence of fossil wood fragments with abundant bone remains of dinosaurs, plesiosaurs and mosasaurs suggest a probable estuarine setting for the deposits. An Albian-Cenomanian(?) age has been suggested by associated palynomorph assemblages, which are commonly recovered from interbedded siltstone and shale layers.
Publications:
ALVES, L.S.R. & KOUTSOUKOS, E.A.M., 1998. Fossil woods of the Serraria
Formation (Upper Jurassic-Lower Cretaceous), Sergipe Basin, NE Brazil:
morpho-anatomic study and paleoclimatic assessment. XL Congresso Brasileiro
de Geologia (Belo Horizonte, 11-16 October 1998), Anais, 448, Belo Horizonte,
SBG-MG.
ALVES, L.S.R. & KOUTSOUKOS, E.A.M., 1998. Fossil Gymnospermae of
the Serraria Formation (Upper Jurassic-Lower Cretaceous), Sergipe Basin,
NE Brazil: preliminary paleoclimatic inferences. Third Annual Conference
of IGCP Project 381 (SAMC III) (Comodoro Rivadavia, 17-20 November 1998),
Asociación Paleontológica del Golfo San Jorge, Boletín
2 (Edición especial), 1.
ASSIS SILVA, C. M. de, ANJOS, S.M.C. dos & DE ROS, L.F., 1999.
Volcanic rock fragments in Upper Cretaceous sandstones of Santos Basin:
evidence for a Paraná Basin provenance. Presented at the First Simposium
on Volcanism and Associated Environments, Gramado, RS, Brazil, June 1999.
Marine turbiditic and shelf sandstones of the Itajaí-Açu
e Juréia formations (Santonian-Maastrichtian) are the main clastic
oil reservoirs of the Santos Basin, offshore eastern Brazil. They are arkoses
and lithic arkoses rich in volcanic rock fragments (VRF). Chlorite is the
major diagenetic constituent, occurring as pore-lining rims which decrease
permeability but help to preserve the porosity of reservoirs. Petrographic
analyses were performed over 230 thin sections sampled from 12 oilwells
cored throughout the basin. The alteration and dissolution of VRF was identified
as the main source of ions for the precipitation of chlorite. In order
to understand and predict the distribution of chlorite in the basin, a
provenance study was focused in the determination of the origin of the
VRF, with the aim to define if they were originated from the Neocretaceous
intrabasinal alkaline volcanism or from the Eocretaceous tholeiitic volcanism
of the Serra Geral Formation from the Paraná Basin. In the first
hypothesis, the distribution of the VRF would be concentrated in the northern
portion of Santos Basin. The petrographic analyses have shown, however,
a basinwide distribution of VRF and the occurrence of acidic VRF in all
samples analysed. Granophyric textures in these VRF are similar to those
of acidic volcanics from the top of Serra Geral Formation Geral, showing
no relation with the texture and composition of the intrabasinal alkaine
volcanics. The texture and composition of the acidic VRF, together with
their wide distribution in good correlation with the basic VRF indicate
that the provenance of Santos Basin VRF was the erosion of the volcanic
plateau of the Paraná Basin during the Late Cretaceous.
Universidade do Vale do Rio dos Sinos (UNISINOS), Centro de Ciências
Exatas e Tecnológicas, Programa de Pós-Graduação
em Geologia
Reported by Antonio Jorge Vasconcellos Garcia - Sedimentary
Geology Program-PPGeo-UNISINOS University, Av. UNISINOS, 950, CEP 93.022.000,
São Leopoldo, RS, Brazil. Tel.: +55 51 5903333/extension 1765/1768/1743/1732;
fax:+55 051 5908177; e-mail: garcia@euler.unisinos.br,
garcia@cpovo.net
Research Program: "PALEOGEOGRAPHICAL, PALEOCLIMATIC AND BURIAL HISTORY
CONTROLS ON THE DIAGENETIC EVOLUTION AND POROSITY DISTRIBUTION IN SANDSTONE
RESERVOIRS/ AQUIFERS"
Main focus on:
Lithofaciologic architecture
Provenance analysis
Diagenetic processes
*Paleogeographical and paleoclimatic analsysis
*Reservoir/aquifer analysis
Research focus to 1999-2001:
1. PALEOGEOGRAPHY AND PALEOCLIMATOLOGY OF MESOZOIC SEQUENCES IN BRAZIL
AND PORTUGAL: basin evolution related to Gondwana breakup and lithofaciologic
and paleoclimatic imprints on diagenetic processes and porosity distribution;
2. PHEATIC AND PEDOGENIC CALCRETE RECORDS IN THE SOUTH AMERICA
MESOZOIC BASINS: paleoenvironmental and paleoclimatic implications to paleogeographic
and paleoclimatic Mesozoic reconstructions;
(New!) 3. PROVENANCE AND DIAGENESIS OF CONTINENTAL MESOZOIC SANDSTONE:
a petrologic tool to basin evolution analysis;
4. LITHOFACIOLOGIC ARCHITECTURE, BASIN EVOLUTION AND POROSITY DISTRIBUTION
IN SANDSTONE RESERVOIRS /AQUIFERS: pathways to fluids in sedimentary basins
Main focus: Integrated approach on basin analysis and sedimentary petrology (Continuing Education Program in Sedimentary Petrology - CEPSP) towards predictive models on the characterization of ore deposits and reservoir/aquifer quality. Provenance analysis, paleogeographical, paleoclimatic and burial-history imprints on diagenetic processes. Lithofaciologic and diagenetic controls on permeability heterogeneity within hydrocarbon reservoirs and aquifers. Sedimentary and diagenetic aspects as ore forming processes. Clay compositions analysis towards the characterization of the diagenetic evolution and geochronology studies of sedimentary sequences. Vulnerability potential analysis of contamination in sedimentary porous aquifers from petrologic studies and geometry, architecture and heterogeneity analysis of sedimentary sequences. Studies applied to understanding: (1) Tectonic imprints on basin evolution and fluid migration in sedimentary sequences; (2) Sequence stratigraphy and depositional systems aspects of reservoir/aquifer rocks geometry, lithofacies architecture and heterogeneity distribution; (3) Geochemistry of the diagenetic processes related to paleoclimatic imprints and ore-forming fluid evolution; (4) Provenance and diagenetic evolution of siliciclastic rocks related to paleogeographical and paleoclimatic aspects, basin burial history and porosity distribution; (5) Paleobiogeographic, paleoclimatic and diagenetic aspects on fossil records in sedimentary sequences.
Ongoing Research (Related to IGCP 381-SAMC Project):
Paleogeographic and paleoclimatic reconstructions of three important
non-marine Mesozoic sequences in Brazil have been the resulted of
field informations including the characterization of the external and
internal geometry of lithofacies and paleocurrent data, and laboratory
studies including provenance and diagenetic/geochemistry analysis: (1)
Pre-rift sequence in Sergipe-Alagoas Basin and northeastern Brazil interior
basins; (2) Bauru Group in northeastern margin of the Paraná Basin,
in Minas Gerais State, and (3) Triassic to Cretaceous continental sequences
in Rio Grande do Sul State. These studies are going to be base for applied
research projects, involving diagenetic evolution and porosity distribution
in sandstone related to reservoir/aquifer architecture and basin evolution.
Mesozoic continental, transitional and marine sequences from Lusitania
and Algarve-Cadiz basins in Portugal are going investigated with the same
approach, involving paleogeographic, paleoclimatic, provenance and diagenetic
analysis. Studies of depositional systems and paleogeographic evolution
of the Camaquã, Santa Barbara and Itajaí basins, in Rio Grande
do Sul and Santa Catarina states, are going the base for petrologic
and geoeconomic/ applied (ore deposits/aquifer potential) investigations
in southern Brazilian Cambrian molassic sequences (research included in
the GEOARQ PROJECT).
Research aims:
1. Paleogeography and paleoclimatology of Mesozoic sequences in Brazil
and Portugal: basin evolution related to Gondwana breackup and lithofaciologic
and paleoclimatic imprints on diagenetic processes and porosity distribution;
2. Pheatic and pedogenic calcrete records in the South America Mesozoic
basins: paleoenvironmental and paleoclimatic implications to paleogeographic
and paleoclimatic Mesozoic reconstructions; 3. Provenance and diagenesis
of continental Mesozoic sandstone: a petrologic tool to basin evolution
analysis; 4. Lithofaciologic architecture, basin evolution and porosity
distribution of sandstone reservoirs /aquifers: pathways to fluids
in sedimentary basins; 5. Origin, migration and fluid-rock interaction
in sedimentary basins: an integrated approach towards a diagenetic model
to exploration of the ore deposits in Cambrian volcano-sedimentary sequences
in southern Brazilian molassic basins and aquifer potential analysis. In
conclusion, the main applied focus of the research projets is to understanding
about the diagenetic processes and porosity evolution, involving fluid
migration and compositional changes in sedimentary rocks, related
to ore-forming fluids and to characterization of reservoir/aquifer, towards
the definition of exploration models.
1. FACIOLOGIC AND PALEOCLIMATIC CONTROLS ON DIAGENETIC PROCESSES AND
POROSITY EVOLUTION IN SANDSTONES - CNPq Proc. 300504/85-3 (BPC 97-99)
2. PALEOENVIRONMENTAL AND PALEOCLIMATIC CONTROLS ON EARLY DIAGENETIC
PROCESSES AND FOSSIL RECORDS IN MESOZOIC SEQUENCES IN BRAZIL AND PORTUGAL
- CNPq Proc. 521457/97-1 (Mod AI , 1998-2000), CNPq/ICCTI(International
Cooperation Brazil-Portugal) Proc. 910174/97-0 e CNPq Proc. 300504/85-3
(BPC 99-01)
3. PROVENANCE AND DIAGENESIS OF THE TRIASSIC AND CRETACEOUS SANDSTONES
IN RIO GRANDE DO SUL STATE, BRAZIL: A PETROLOGICAL APPROACH TO LITHOFACIOLOGIC
AND TAPHONOMIC CHARACTERIZATION (FAPERGS Proc. 93/2906.3)
4. GEOMETRIA, ARQUITETURA E HETEROGENEIDADES DE CORPOS SEDIMENTARES
Projeto PADCT III/1998-2000) (GEOARQ RESEARCH GROUP/UNISINOS)
RESEARCH #01 - PALEOGEOGRAPHY AND PALEOCLIMATOLOGY OF MESOZOIC SEQUENCES IN BRAZIL AND PORTUGAL: BASIN EVOLUTION RELATED TO GONDWANA BREAKUP AND LITHOFACIOLOGYC AND PALEOCLIMATIC IMPRINTS ON DIAGENETIC PROCESSES AND POROSITY DISTRIBUTION (Sub-project # 1.1. Dinosaurs of Brazil Project; Sub-project # 1.2. Paleoenvironmental and paleoclimatic controls on early diagenetic processes and fossil records in Mesozoic sequences in Brazil and Portugal.)
Collaborators: A. J. V. Garcia (UNISINOS University, Brazil - Chairman); E.L.C.Lavina (UNISINOS University, Brazil); U.F. Faccini (UNISINOS University, Brazil); C.H.Nowatski (UNISINOS University, Brazil); K. Goldberg (Chicago University, EUA); A.A.S. da Rosa (UFSM,Brazil); T.M. de Azevedo (Lisboa University, Portugal); A.N. Azeredo (Lisboa University, Portugal); M.C. de S. Cabral (Lisboa University, Portugal); N.L. Pimentel (Lisboa University, Portugal); R.P. dos Reis (Instituto Geológico e Mineiro-IGM, Portugal).
Sources of external funding: CNPq; CNPq-ICCTI(Portugal) International
Cooperation; CAPES; UNISINOS University; Lisboa University.
Short Report: Main focus on paleogeographic,
paleoclimatic and paleobiogeographic aspects in Brazilian and Portuguese
Mesozoic sequences; Basin evolution related to Gondwana breackup and lithofaciologic
and paleoclimatic imprints on diagenetic processes; aspects of the Mesozoic
continental and marine sequences related to Gondwana evolution and to Atlantic
Ocean opening.
(Activities and main results) - Paleocurrent and provenance analysis
of the Brazilian Cretaceous continental sandstone to improve the characterization
of the highlands during the Gondwana evolution - Paleocurrent and provenance
analysis towards the characterization of source areas to Cretaceous fluvial
sandstone deposited at the before and after the Gondwana breakup involving
the South America and African continents. Were studied the Early Cretaceous
(Berriasian) pre-rift fluvial and eolian deposits of the Serraria, Sergi
and Missão Velha formations, in the coastal and interior northeastern
Brazilian basins (Garcia, 1992; Goldberg, 1995 and da Rosa 1996), and the
Late Cretaceous (Coniacian to Maastrichtian) post-rift sandstone of the
Baurú Group, in the present northeastern margin of the
Paraná Basin, at Minas Gerais State, Brazil. The same methodological
approach is applied today to analysis of the Triassic deposits in the
Paraná Basin, present at the outcrop area at the Rio Grande do Sul
State, Brazil. These sequences offer a good opportunity to analysis of
provenance involving different stages of the Gondwana evolution and breakup.
These studies have been applied to understanding the Mesozoic paleobiogeographic
aspects related to dinosaur records of these sequences, largely controlled
by the sequential breakup of Gondwana (Garcia et al., in press). Locally,
the migration and preferential distribution of dinosaurian living sites
were controlled by paleoclimatic conditions, paleogeographic features
and eventually by volcanic activities. The paleogeographic re-constructions
resulted of the present on going research will be important to understanding
the preferential regions to marine invasions on the South American continent
during the Mesozoic time (the South American Mesozoic Seaways).
Publications:
GARCIA, A.J.V., DA ROSA, A A S. & GOLDBERG, K., 1998. Paleocurrent
and provenance analysis of the Brazilian Cretaceous continental sandstones:
a approach to characterization of the highlands during the Gondwana evolution.
3rd Annual Conference of IGCP Project 381, South Atlantic Mesozoic Correlations
(SAMC III), Comodoro Rivadavia, Argentina, 17-20 november 1998. (SAMC Project/IGCP
381 Contributions); Abstracts, ISSN 15140784, p. 14-15.
GARCIA, A.J.V., DA ROSA, A.A.S & GOLDBERG, K., 1999. Paleoenvironmental
and paleoclimatic controls on early diagenetic processes and fossil records
in continental Cretaceous sandstones in Brazil: A petrologic approach.
Boletin do 5º Simpósio sobre o Cretáceo do Brasil. 1º
Simposio sobre el Cretácico de América del Sur. Fourth Annual
Conference of IGCP Project 381 (SAMC IV). p. 491-495. UNESP-Campus de Rio
Claro,SP. Serra Negra,SP. (ISSN 1516-8239)
GARCIA, A.J.V., DA ROSA, A.A.S & GOLDBERG, K., in press. Paleoenvironmental
and paleoclimatic controls on early diagenetic processes and fossil records
in continental Cretaceous sandstones in Brazil: A taphonomic approach.
Journal of South American Earth Sciences, Special Issue, IAS 18th Regional
Meeting of Sedimentology. Heidelberg, Germany,
GOLDBERG, K. & GARCIA, A.J.V., in press. Palaeobiogeography of
the Bauru Group, a dinosaur-bearing Neocretaceous unit at Northeastern
Parana Basin, Brazil. Cretaceous Research, Special Issue on Mesozoic
Biogheographical Patterns in the South Atlantic.
DA ROSA, A.A.S. & GARCIA, A.J.V., in press. Palaeobiogeographic
aspects in Berriasian (Early Cretaceous) at Brazilian North-Eastern
Basins, before the Gondwana Breack-up. Cretaceous Research, Special Issue
on Mesozoic Biogeographical Patterns in the South Atlantic.
RESEARCH #02 - PROVENANCE AND DIAGENESIS OF CONTINENTAL MESOZOIC SANDSTONE: A PETROLOGIC TOOL TO BASIN EVOLUTION ANALYSIS (Sub-project 2.1. Provenance and diagenesis of the Triassic and Cretaceous sandstones in Rio Grande do Sul State, Brazil: a petrological approach to lithofaciologic and taphonomic characterization);
Collaborators: A. J. V. Garcia (UNISINOS University, Brazil
- Chairman); E.L.C.Lavina (UNISINOS University, Brazil); U.F. Faccini (UNISINOS
University, Brazil); C.H.Nowatski (UNISINOS University, Brazil); K. Goldberg
(Chicago University, EUA); A.A.S. da Rosa (UFSM,Brazil); H. Zerfaz (UNISINOS
University, Brazil); A. M. Suszczysnki (UNISINOS University, Brazil); S.
Viana, (UFPe, Brazil); Ana Maria P. Mitsusaki (UFRGS).
Sources of external funding: FAPERGS; São Pedro do Sul District
Office; Candelária District Office; UNISINOS University; UFSM University.
Short Report: (main focus) -The aim of this project is
to test the applicability of the petrologic studies (provenance and diagenetic
analysis) in local and regional basin analysis. The methodology include
the conventional facies analysis in regional and local scales to identify
the depositional systems, alterations of alluvial styles and staking patterns.
The hierarchical classification of bounding surfaces and architectural
elements, are used in the outcrop scale. The major objective on the petrological
approach is to identify major hiatus correspondents to regional unconformities
that leads to delimitated mappable allostratigraphic units. (activities
and main results) - Provenance of the Triassic fluvial sequences in the
Rio Grande do Sul State, Southern Brazil: A contribution to Gondwana paleogeography
- The Gondwanic sedimentary sequences of the Paraná Basin at the
Rio Grande do Sul State include the Late Permian to Early Cretaceous sedimentary
records. The main focus of the integrated stratigraphic and petrologic
studies until the present was concentrated in the Middle to Late Triassic
Santa Maria Formation. The fluvial, floodplain and lacustre lithologies
of the Santa Maria Formation occur in an unconformity over aeolian and
fluvial deposits (paleocurrents to the N) of the Sanga do Cabral Formation
(Late Permian to Early Triassic). Recovering the Santa Maria deposits occur
Botucatu Formation eolian sandstones (Early Cretaceous). The Santa Maria
Formation is characterized at the lower part by coarse sand stone and conglomerate
sandstone related to a braided fluvial system from S-SW (Passo das Tropas
Sandstone, Anisian to Ladinian ages). Toward to the top of the unit, the
fluvial sandstone with paleocurrents from the S-SW to N-NE, occur interlayed
to floodplain and lacustrine claystone and siltstone of the Alemoa Member,
Ladinian to Carnian/Norian ages. Coarse to conglomerated fluvial
sandstone, with paleocurrents mainly to NE-E, including large siliffied
woods at the uppermost part of the unit in the area, were informally
called "Mata Sandstone" (Rhaetic age). All the sandstone intervals reveal
an origin related to an interior craton, with a slithery towards the basement
uplift condition when plotted in Dickinson et al. (1983) provenance diagram.
At the time of Sanga do Cabral Formation deposition (Schytian) were dominants
by sedimentary reworked processes in the basin, associated at a stable
intracontinental cratonic condition. At the Upper Anisian/Lower Ladinian
the stability was broken with a uplift of a S-SW source area, resulting
at the sedimentation of the Lower interval of the Santa Maria fluvial deposits
(Passo das Tropas Member). In continuity, the basin returned to a relative
stable condition (during the Carnian and probably part of the Norian) with
a slow subsidence history (deposition of the Alemoa Member). The large
amount of fossil woods in the Mata Sandstone indicated the presence
of a forest at SW-W of the studied region. This forest was eroded during
a new unstable phase (Rhaetic-Lower Jurassic?), when the basin subsidence
history was fast again. The paleogeographic and paleoclimatic reconstruction
models will be integrated at the next step of our Sedimentary Geology Research
Group to conclude the focus on the Gondwana paleogeography at the Mesozoic
time. Petrological approach to recognization of internal unconformities
in continental Triassic deposits in southern Paraná Basin, Brazil
- Petrological evidences characterized in the Triassic continental sandstone
of the Paraná Basin in Southern Brazil, indicated important internal
unconformity in fossiliferous sequences of Santa Maria and Caturrita (?)
Formations in Rio Grande do Sul State. Supported by the petrologic aspects
it is possible suggest two different sedimentary phases for the upper part
of the Santa Maria Formation and the uppermost sandstone interval (Caturrita
Formation) during the basin evolution, separated by an important internal
unconformity. In the field the unconformity was recognized by an irregular
surface characterized by a concretional carbonate cemented sandstone with
fragments of the lowed siltstone, bone fragments and roots evidences, indicating
subaereal exposition and pedogenetic processes. Diagenetic features and
porosity distribution in Triassic sandstone aquifers in Southern Paraná
Basin, Brazil - The petrologic approach developed to analyze of the
Triassic Gondwanic sedimentary sequences of the Paraná Basin, in
Rio Grande do Sul State, Brazil, following the same methodological schedule
used before to investigation of the Early and Late Cretaceous continental
sandstones in Northeastern of Brazil and Minas Gerais State, respectively
(Garcia et al., 1998; Goldberg & Garcia, 1996). The diagenetic history
of the different Triassic sandstone intervals analyzed permitted
characterize the permo-porosity aspects and their aquifer potential.
The porosity of these sandstone is conditioned to three main controls:
1. Intensity of clay mineral infiltration during the eodiagenesis; 2. Intensity
and distribution of early cementation, related to the packing index definition,
and 3. Participation of solvent telodiagenetic fluids promoting the total
or partial dissolution of cements and detrital grains and, consequently,
increasing the secondary porosity. In this way, the coarse sandstones of
the Passo das Tropas present the best permo-porosity condition (non-significant
presence of clay infiltration processes, important eodiagenetic cementation
supporting the loose packing characteristics and a significant telodiagenetic
dissolution phase). The relative large presence of infiltrated clays in
the Mata Sandstone and the absence of significant early cementation processes
indicate a small aquifer potential to this interval.
Publications:
FACCINI, U.F., ZERFASS, H. & GARCIA, A.J.V., 1998. The Upper
Permian-Triassic stratigraphy and petrologic approach of the continental
sandstone in SE Paraná Basin, Southern Barzil: depositional
styles versus base level changes. In : Bachamann, G. 1998. Epicontinental
Triassic International Symposium, Halle/S., Germany; p. 11.
FACCINI, U.F., LAVINA,E.L.C., ZERFAZ, H. & GARCIA, A J.V., 1998.
Stratigraphic framework of the Permian-Triassic sequences in the southern
Paraná Basin, Brazil. 3rd Annual Conference of IGCP Project 381,
South Atlantic Mesozoic Correlations (SAMC III), Comodoro Rivadavia, Argentina,
17-20 november 1998. (SAMC Project/IGCP 381 Contributions); Abstracts,
ISSN 15140784, p. 16-18.
ZERFAZ, H., SUSZCZYSNKI, A.M., LAVINA, E.L.C., FACCINI, U.F. &
GARCIA, A.J.V., 1998. Provenance of the Triassic sequences in the Rio Grande
do Sul State, southern Brazil: a contribution to Gondwana palaeogeography.
3rd Annual Conference of IGCP Project 381, South Atlantic Mesozoic Correlations
(SAMC III), Comodoro Rivadavia, Argentina, 17-20 november 1998. (SAMC Project/IGCP
381 Contributions); Abstracts, ISSN 15140784, p. 19-21.
ZERFAZ, H., GARCIA, A . J.V., SUSZCZYSNKI, A.M., FACCINI, U.F. &
LAVINA, E.L.C., 1998. Diagenetic evolution and porosity distribution in
Triassic sandstone reservoirs in southern Paraná Basin, Brazil.
3rd Annual Conference of IGCP Project 381, South Atlantic Mesozoic Correlations
(SAMC III), Comodoro Rivadavia, Argentina, 17-20 november 1998. (SAMC Project/IGCP
381 Contributions); Abstracts, ISSN 15140784, p. 22-24.
VIANA, S., ZERFAZ, H. & GARCIA, A.J.V., 1998. Petrological approach
to recognize internal unconformities in continental Triassic deposits in
southern of the Paraná Basin, Brazil. 3rd Annual Conference of IGCP
Project 381, South Atlantic Mesozoic Correlations (SAMC III), Comodoro
Rivadavia, Argentina, 17-20 November 1998. (SAMC Project/IGCP 381 Contributions);
Abstracts, ISSN 15140784, p. 25-27.
RESEARCH #03 - LITHOFACIOLOGIC ARCHITECTURE, BASIN EVOLUTION AND POROSITY DISTRIBUTION IN SANDSTONE RESERVOIRS /AQUIFERS: pathways to fluids in sedimentary basins (Sub-project # 3.1. Faciologic and paleoclimatic control on diagenetic processes and porosity evolution in sandstone; Sub-project 3.2. Geometry, architecture and heterogeneity characterization in sedimentary sequences)
Collaborators: A. J. V. Garcia (UNISINOS University, Brazil
- Chairman); P.S.G. Paim (UNISINOS University, Brazil - Chairman); S. Morad
(Uppsala University, Sweden); L.F. De Ros (UFRGS, Brazil); K. Goldberg
(Chicago University, USA); A. A. S. da Rosa (UFSM, Brazil); E.L.C. Lavina
(UNISINOS University, Brazil); U.F. Faccini (UNISINOS University, Brazil);
C.H. Nowatski (UNISINOS University, Brazil); F.J. Althoff (UNISINOS University,
Brazil); O.G.W. Coelho (UNISINOS University, Brazil); R.P. dos Reis (Instituto
Geológico e Mineiro-IGM, Portugal); C. E. de Souza Cruz (CENPES/PETROBRAS);
C. J. Appi (CENPES/PETROBRAS); G.Schwedersky Neto (CENPES/PETROBRAS); J.
E. Faccion (CENPES/PETROBRAS); M. das G.F. da Costa (CENPES/PETROBRAS);
M.R. Becker (CENPES/PETROBRAS); N.C. de Azambuja Filho (CENPES/PETROBRAS);
T. M. de Oliveira (CENPES / PETROBRAS); E. Camozzato (CPRM - Geological
Survey of Brazil); J.L.F. Machado (CPRM - Geological Survey of Brazil);
R. da C. Lopes (CPRM - Geological Survey of Brazil); C.M.S. Scherer (UFRGS,
Brazil); F. Chemale Jr. (UFRGS, Brazil); F.L. Wankler (UFRr, Brazil).
Sources of external funding: CNPq; PADCT III/FINEP; PETROBRAS; CPRM
- Geological Survey of Brazil; UNISINOS University; Uppsala University
- Sweden; University of Chicago - USA.
Short Report: (main focus) - Geometry and lithofaciologic architecture characterization and heterogeneity distribution in sedimentary sequences; Lithofaciologic and basin evolution controls on diagenetic processes and porosity distribution within hydrocarbon sandstone reservoirs and aquifers; Paleogeographic and paleoclimatic control on sandstone framework composition; Diagenetic processes and changes of the detrital composition - implications on provenence analysis; Paleoenvironmental, paleogeographic and paleoclimatic controls on the fluid composition and early diagenetic processes; Exposure imprints on diagenetic evolution and porosity distribution in sandstone; Origin and geochemical evolution of diagenetic fluids in diferent diagenetic settings/burial history.. (activities and main results) - The two sub-projects related to the research programme include continental, transitional and marine sequences in Paleozoic and Mesozoic Brazilian and Portuguese sedimentary basins. Paleogeographic and paleoclimatic reconstruction of three continental Mesozoic sequences in Brazil have been doing, considering field information (including external and internal geometry characterization of lithofacies and paleocurrent data) and petrologic studies (provenance and diagenetic analysis): (1). Late-Jurassic to Early-Cretaceous pre-rift sequence in coastal and interior northeastern Brazilian basins; (2) Late-Cretaceous post-rift Bauru Group in northeastern margin of the Parana Basin, in Minas Gerais State, and (3) Triassic to Cretaceous fluvial, lacustrine and eolian deposits in Rio Grande do Sul State. Geometry, architecture and porosity distribution in Mesozoic sandstone in the Southern Paraná Basin, Brazil: Porous aquifers potential in Mercosul context - The study of aquifers potential of the Permian-Triassic to Cretaceous Gondwanic sedimentary sequences (part of the "Guarani Aquifer") of the Paraná Basin, RS, Southern Brazil, is based on the descriptions of selected outcrops (characterization of the sequence boundaries represented by abrupt changes in depositional styles observed in regional sections and alluvial/eolian deposits architecture) and diagenetic features observed in rock thin sections. Our study register that the complexity of internal heterogeneity of the Mesozoic Guarany Aquifer in the MERCOSUL context will be better understanding by detailed stratigraphic and petrological analysis.
Publications:
GARCIA, A.J.V., MORAD, S., DE ROS, L.F. & AL-AASM, I.S., 1998.
Paleogeographic, paleoclimatic and burial-history controls on the diagenetic
evolution of reservoir sandstones: evidence from the Lower Cretaceous Serraria
sandstones in Sergipe-Alagoas Basin, NE Brazil. In: Morad, S. (ed.) Carbonate
Diagenesis in Sandstone, IAS Special Publication 26. Oxford, UK. ; p. 107-140.
Faccini, U.F., Garcia, A.J.V., Lavina, E.L.C., Suszczysnki, A . M.
& Zerfass, H., 1999. Geometry, architecture and porosity distribution
in Triasic sandstone, in Southern Paraná Basin, Brazil: Porous aquifers
potential in the Mercosul context. 51ª Reunião Anual da SBPC
(Sociedade Brasileira para o Progresso da Ciência), Porto Alegre,
RS, Brasil. P.97 (Seção Poster).
GARCIA, A.J.V., FACCINI, U.F., LAVINA, E.L.C., ZERFASS, H. & SUSZCZYSNKI,
A. M., in press. Geometry, architecture and porosity distribution in Mesozoic
sandstone in Southern Paraná Basin, Brazil: Porous aquifers potential
in the Mercosul context. GSA Annual Meeting & Exposition, Denver, Colorado,
USA. (Poster Session).
TEACHING PROGRAMS:
Continuing Education Program in Sedimentary Geology (CEPSG), related
to the development of research projects.
Focus on: Integrated approach on basin analysis and sedimentary petrology
(Continuing Education Program in Sedimentary Petrology - CEPSP) towards
predictive models on the characterization of ore deposits and reservoir/aquifer
quality. Provenance analysis, paleogeographic, paleoclimatic and burial-history
imprints on diagenetic processes. Lithofaciologic and diagenetic controls
on permeability heterogeneity within hydrocarbon reservoirs and aquifers.
Sedimentary and diagenetic processes as ore forming processes.
Under-graduation level:
1. Brazilian sedimentary basins and the petroleum exploration (CEPSP).
2. Geometry, architecture and porosity distribution in sandstone: reservoir/aquifer
characterization from outcrop, core sample, and thin section studies (CEPSP).
3. Provenance and diagenesis of sandstone: textural and compositional
analysis (CEPSP).
4. Carbonate rock petrology (CEPSP).
5. Diagenetic analysis: an important tool in sedimentary ore deposits
studies. (CEPSP).
Post-graduation level:
1. Tectonic imprints on basin evolution and fluid migration in sedimentary
sequences.
2. Sequence stratigraphy and depositional systems.
3. Characterization of reservoir rocks: geometry, architecture and
heterogeneity distribution.
4. Sampling, preparation and analytic methods in sedimentary petrology
(CEPSP).
5. Provenance and diagenesis of siliciclastic rocks: A paleogeographic
and petrologic approach on diagenetic processes and porosity evolution(CEPSP).
6. Diagenetic evolution and porosity distribution in sedimentary reservoir/
aquifer(CEPSP).
7. Geochemistry of the diagenetic processes: Paleoclimatic imprints
and ore-forming fluid evolution(CEPSP). 8.Applied isotope analysis in geology:
geochronology of clay mineral and stable isotope in sedimentary geology.
Lecture Program:
1.Faciologic, paleoclimatic and burial history controls on diagenetic
processes and porosity evolution in sandstone;
2.Paleobiogeographic and paleoclimatic aspects of the Brazilian dinosaurs
sites and the Gondwana evolution;
3.Provenance and diagenesis: An interdisciplinar approach in basin
analysis and avaliation of mineral resources;
4.Ore-forming geofluids: A sedimentary geology approach.
Universidad de la Republica, Uruguay
Reported by Daniel (e-mail: perea@fcien.edu.uy)
Title of Research Project: "Tetrapodos mesozoicos del Uruguay"
a) List of collaborators:
Dr. Daniel Perea (paleontologist) - Coordinator
M.Sc. Cesar Goso (geologist)
Dr. Martin Ubilla (paleontologist)
b) Source of external money: Comision Sectorial de Investigacion Cientifica
(CSIC), Universidad de la República (1996-97)
Publications :
GOSO, C., PEREA, D. & PERINOTTO, J.A.J.,. 1999. Estratigrafia de
la Fm. Guichon (Cretacico Inferior) en la cuenca del litoral, Uruguay.
Boletim do 5º Simposio do Cretaceo do Brasil, I Simposio sobre
sobre el Cretacico de America del Sur: 321-326 - Rio Claro (SP).
MARSICANO, C., PEREA, D. & UBILLA, M., in press. The first occurrence
of a temnospondyl amphibian from Uruguay, and the South American temnospondyl
record. Alcheringa. Australia.
Short report on activities and main results: Since September
1998 we are working with fossils from bone beds included in sediments of
Tacuarembo Fm. The first results are the finding of new taxa
for S.A. and Uruguay that probably reflect an Late Jurasic-Early Cretaceous
Age. That results could be comunicated in the Congreso Americano
de Herpetología (Uruguay) and the Meeting of the SAMC 381 project
in Luanda, Angola.
Research projects at the National university of Rosario, Argentina.
Reported by Horacio Parent - Laboratorio de Paleontología y
Biocronologia, Instituto de Fisiografía y Geología, FCEIA,
Universidad Nacional de Rosario, Pellegrini 250, 2000 Rosario, Argentina.
(fax: +54 341 480 2654, e-mail: parent@fceia.unr.edu.ar)
Programm of Research PLPB 001: “EL JURASICO MEDIO-SUPERIOR ANDINO” [THE
ANDEAN MIDDLE-UPPER JURASSIC]
Director: H. Parent, Laboratorio of Paleontología, IFG, FCEIA,
Universidad Nacional de Rosario.
This programm was designed to allocate different research projects
in a coherent body of a new line of research at the National University
of Rosario.
Colleagues around the world are cordially invited to join their
activities and to propose research projects, short or long in scope and
duration- to be developed in collaboration with the Laboratorio de Paleontología
(IFG, FCEIA, UNR).
Research Projects included up to 18/04/99:
• The Oxfordian ammonite fauna and biostratigraphy of the Neuquén-Mendoza
basin (Upper Jurassic, Argentina).
Director: H. Parent. Collaborators: O. D. Capello y Leonardo Filippi
(Lab. de Paleontología, IFG, UNR).
Publications:
Parent, H., 1998. Upper Callovian to Upper Oxfordian Ammonite Biostratigraphy
of the Transect Chacay Melehue-Sierra de Reyes, Argentina. Actas del 4to
Congreso de Jurásico de España. Cuadernos de Geología
Ibérica 24: 261-275.
• The Kimmeridgian-Tithonian ammonite fauna and biostratigraphy of the
Neuquén-Mendoza basin (Upper Jurassic, Argentina).
Director: H. Parent. Collaborators: O. D. Capello y Leonardo Filippi
(Lab. de Paleontología, IFG, UNR).
Publications:
Parent, H. & O. D. Capello, O.D., 1999. Amonites del Tithoniano
Inferior de Casa Pincheira, Mendoza (Argentina). In: 1er Simposio Jurásico
de América del Sur. Revue de Paleobiologie 18(1).
Parent, H., 1999. The Succession of Faunal Horizons in the Tithonian
of the Neuquen-Mendoza basin (Upper Jurassic, Argentina). Report still
unpublished.
Abstract.- From the analysis of the ammonite succession of 4 selected
sections of Neuquén and Mendoza (Casa Pinchiera, Mallín Redondo,
Arroyo del Yeso y Cerro Lotena), 24 faunal horizons are defined through
the Andean Tithonian of the Neuquén-Mendoza basin. The recognition
of faunal horizons could be the start point to the refinement of the standing
biozonation. The succession of faunal horizons here proposed is a system
open to the introduction of other ones, recongnized at the same or other
sections, simply by insertion.
Parent, H., submitted. The Ataxioceratid Ammonite Fauna of the Tithonian
of Casa Pincheira, Mendoza (Argentina). In: H. Parent (ed.): Symposium
on the Jurassic of South America. Journal of South American Earth Sciences,
Sp. Issue.
UNPSJB (Patagonia University), Comodoro Rivadavia, Chubut, Argentina.
Reported by Eduardo A. Musachio (e-mail: aldo@unpbib.edu.ar)
From the Regional Coordinators of Argentina (E. Musachio &
E. Olivero) :
The Argentine Coordinators wishes to thank the Colleagues visiting
Patagonia at the SAMC 381 4th Annual Conference in Comodoro Rivadavia
and Ushuaia (November 1998). Details of the Annual Conference, including
the field trips to Chubut River Medium Valley and Tierra del Fuego, where
previously reported in the SAMC News 13: 9-15. The Abstracts of the Conference
where published in the Boletín of the Asociación Paleontológica
del Golfo San Jorge; 2 (Special Issue) 38 pages; 1998; Comodoro Rivadavia
(ISSN 15140784).
The activity of the Paleovertebrates Laboratory (Prof. Rubén
Martínez, Marcelo Luna and Gabriel Casal) was mainly devoted
to the dinosaurians remains in the Bajo Barreal Formation (Upper Cretaceous),
Chubut Province, Central Patagonia. The last findings are remains of a
tetanuran Theropoda with hiperstrophic claws in the posterior member as
in Megaraptor (Novas, 1998).
Abstracts:
Martínez, R. “Notohypsilophodon comodorensis”, un Hipsylophodontidae
(Ornitischia: Ornithopoda) del Cretácico Superior de Chubut Patagonia
Central, Argentina”. XV Congreso Brasileiro de Paleontologia - São
Pedro 1998, Brasil.
Martínez, R. & Novas, F. “Un nuevo tetanuro (Dinosauria:
Theropoda) de la Formación Bajo Barrial (Cretácico Superior),
Patagonia”. XIII Jornadas Argentinas de Paleontología de Vertebrados.
1997.
Martínez, R. “An articulated skull and neck of Sauropoda (Dinosauria:
Saurischia) from the Upper cretaceous of central Patagonia”. Abstract of
papers P 616, 58th. Annual Meeting-Snowbird-Utah, 1998
Martínez, R. “The occurrence of dinosaur lineages with Pangeic
distribution in Upper Cretaceous of Chubut, Central Patagonia” Bol. Asoc.
Paleont. GSJ (3th. Annual Conference, SAMC 381) 2: 20-21. Comodoro Rivadavia.
Papers:
Martínez, R., in press. “Notohypsilophodon comodorensis”, un
Hipsylophodontidae (Ornitischia: Ornithopoda) del Cretácico Superior
de Chubut Patagonia Central, Argentina”. Acta Geologica Leopoldensia, Brazil.
Martínez, R. Lamanna, M., Smith, J., Casal, & G. Luna, M.,
in press. “New theropod remains from the Bajo Barreal Fm. Central
Patagonia” 59th. Annual Meeting, Abstracts of Papers; Society of Vertebrate
Paleontology, Denver, USA.
Lamanna, M., Martínez, R., & Smith, J. “A definitive abelisaurid
theropod dinosaur from the Early Late Cretaceous of Patagonia” (submitted,
1999) .
The team of geologists-micropalaeontologists of the Laboratorio de Bioestratigrafia develops a program devoted to different topics of the SAMC 381, including the following projects:
A. Palynology of middle and upper Cretaceous deposits in Central and Northern Patagonia (Argentine), reported by Patricia Vallati (e-mail: rsandoval@sinectis.com.ar):
1. Palynological studies of the “dinosaurian beds” (middle-upper
Cretaceous of the Neuquén Basin).
These are postorogenic deposits that yield few paleontological evidences
to suggest the age of the deposits. Palynological fertile samples were
recovered from Huincul Formation, a basal unit of the group in the El Zampal
Locality (South of Mendoza Province).
The Huincul microflora includes angiosperm pollen grains
of the monosulcate, tricolpate, tricolporoidate and tricolporate types.
These are the dominant forms in the assemblage (over 60%). This angiosperm
pollen association is characterized by the presence of Retimonocolpites
cf. peroreticulatus, Peninsulapollis sp., Tricolpites cf. variabilis,
Tricolpites cf. sagax, Dryadopollis sp., Fraxinoipollenites fragilis, Gemmatricolpites
sp., Tricolporoidites sp., Rousea sp., Psilatricolporites sp. and
verrucate tricolpate grains with triangular amb (gen. et sp. indetermined).
Besides, miospores and gymnosperm pollen grains are also
present in this assemblage. Among others, the following taxa are recognized:
Foraminisporis assymmetricus, Concavissimisporites punctatus, Leptolepidites
cf. proxigranulatus, Triporoletes reticulatus, Polycingulatisporites cf.
reduncus, Taurocusporites segmentatus, Cyclusphaera psilata, Balmeiopsis
limbatus, Callialasporites dampieri, Microcachryidites antarcticus
and Equisetosporites spp.
The Huincul assemblage is undoubtedly younger than the
underlying Aptian Ranquiles association with primitive angiosperm pollen
grains (Vallati, 1995). On turn, it seems to be prior to the appearance
of triporate grains that takes place in the middle/upper Cenomanian of
Northern and Southern Hemispheres.
2. Distribution of Afropollis assemblage
Afropollis, a common genus for the Aptian-Cenomanian of low palaeolatitudes
Microfloral Provinces, is well represented in the Neuquén Basin,
Septentrional Patagonia (Vallati, 1995, in Actas VI Congr. Argent. Paleont.
y Bioestrst.: 277-290, Trelew). This is, up to now, the southernmost appearance
of the genus. Additional studies are being carried out in order to
precise the systematic and the distribution of Afropollis in Patagonian
basins.
Papers:
Vallati, P., 1998. Palynology of the Huincul Formation (middle Cretaceous)
in the Neuquén Basin, Patagonia, Argentina. Abstracts of the SAMC
381 Third Annual Conference in: Bol. Asoc. Paleont. GSJ (Special Issue),
2: 30-32. Comodoro Rivadavia.
Vallati, P., submitted: Middle Cretaceous Microflora from the Huincul
Formation (“Dinosaurian Beds”) in the Neuquén Basin, Patagonia,
Argentina.
B. Dealing with biostratigraphy and paleobiogeography based on
calcareous microfossils M. Simeoni & E. A. Musacchio (both: aldo@unpbib.edu.ar)
have published the paper: “Cretaceous calcareous microfossils from Southern
South America” in Zentralblatt für Geologie und Paläontologie,
1998, I (11/12): 1403-1420, reporting the following conclusions:
1. Lacustrine Early Cretaceous non-marine assemblages of calcareous
microfossils from Patagonia show endemism. 2. Marine Early Cretaceous benthonic
calcareous microfossils from west central Argentina resemble similar faunas
from South Africa. 3. The Schyzocytheridae (marine Ostracoda) originated
during the Jurassic in the Southern Hemisphere. They migrated during the
Early Cretaceous to the Tethyan domain, via the Indian Ocean seaway. 4.
In the Aptian the isolation of continental environment was broken when
a phase of regional uplift occurred. 5. Tethyan ostracods have been
recovered in Cenomanian beds from Bolivia. 6. During Late Cretaceous times,
non-marine assemblages from Northern Patagonia exhibit high taxonomic diversification.
Interchanges with basins of east Brazil, Africa and southern Europe are
well documented.
C. Dealing with non marine calcareous microfossils, E.
A. Musacchio has now in press (Cretaceous Research) the paper: “Biostratigraphy
and biogeography of Cretaceous charophytes from South America”. The main
results of the contribution are listed as follows:
1. The Early Cretaceous (pre Upper Barremian) charophytes microfloras
are characterized by the Genus Mesochara and clavatoracean forms. Several
species are presumably endemic. The extra-Andean basins are related to
rifting processes. The isolation of the basins accentuates the endemism
of the lacustrine biota. 2. The most conspicuous Aptian taxa are widely
distributed. The interchange of microfossils with other continents seems
to have been facilitated by geological conditions related to an Early Aptian
phase of uplift. In different geological provinces of the continent non-marine
Aptian facies are widely distributed, overlying the substratum disconformably.
3. The Late Cretaceous floras display the highest diversity and abundance
of the South American fossil record of the group. Two biogeographic units
are differentiated: the South American Andean province (showing North American
affinities) and the South American Atlantic province (exhibiting Meridional
European affinities). 4. The K/T boundary is not marked by a significant
replacement of taxa but there is a decrease in floral diversity across
the boundary interval. However, some markers in the Early Tertiary units
of different countries (North America, Europe and Asia) can be recognized.
CENTRO AUSTRAL DE INVESTIGACIONES CIENTIFICAS (CADIC-CONICET)
Ushuaia, Tierra del Fuego, Argentina.
Reported by Eduardo B. Olivero (Regional Coordinator) -
CADIC, Av. Malvinas Argentinas s/no., 9410 Ushuaia, Tierra del Fuego, Argentina.
(e-mail: eolivero@ satlink.com)
Research activities:
I) Jurassic-Paleogene geological evolution of the Andes of Tierra del
Fuego.
II) Santonian-Maastrichtian stratigraphy, paleontology, and sedimentology
of the James Ross Basin, Antarctica.
I) JURASSIC – PALEOGENE GEOLOGICAL EVOLUTION OF THE ANDES OF TIERRA DEL FUEGO
1) Title of Research Project:
Paleontology, Stratigraphy, and Sedimentology of Mesozoic-Paleogene
marine succesions of Tierra del Fuego. E. B. Olivero, Director. PICT 221-PIP
4304, CONICET, Argentina.
a) List of collaborators:
Dr. Norberto Malumian, general geology, and micropaleontology (Foraminifera),
Servicio Geologico-CONICET;
Dr. Roberto Scasso, sedimentology and stratigraphy, Univ. Buenos Aires-CONICET
Lic. Francisco Medina, stratigraphy and invertebrate paleontology,
CONICET;
Lic. Susana Palamarczuk, micropaleontology (palynology), CONICET;
Lic. Daniel R. Martinioni, general geology, stratigraphy, sedimentology,
CONICET.
Lic. Matías Ghiglione, structural geology and tectonics
b) Source of external money: CONICET, Argentina.
2) Title of Research Project:
Prospection, sedimentary environments, and genesis of phosphate deposits
in Patagonia. UBACYT Ex 299, Dr. R. A. Scasso and Dra. Liliana Castro,
Directors.
a) List of collaborators:
Dr. Eduardo B. Olivero, CONICET
b) Source of external money: University of Buenos Aires.
1c; 2c) Short report on activities and main results since September
1998:
We continue our studies on the stratigraphy and sedimentology of the
deep marine Jurassic-Cretaceous deposits of the Rocas Verdes Marginal Basin
and their stratigraphic transition to slope-distal platform Cretaceous
deposits and foreland Cretaceous-Paleogene successions of the Austral and
Malvinas basins. In 1998/1999, we have produced new studies in the area
including a schematic geological map covering the Argentinean part of the
Isla Grande de Tierra del Fuego and a review of the Mesozoic-Paleogene
geology of the Andes Fueguinos. Previous studies on the Cretaceous-Paleogene
stratigraphy of Tierra del Fuego figured as submitted or in press in the
last report are now published and full citations are quoted at the end
of the report.
We continue to study the marine phospates anomalies in the Paleogene
succession of Isla Grande de Tierra del Fuego.
3) Title of Research Project:
Geophysics and Geodynamics studies in Tierra del Fuego. PICT Agencia
Nacional de Promoción Científica y Tecnológica, Argentina.
Director: Dr. Raúl Perdomo, Universidad Nacional de la Plata, Argentina.
a) List of collaborators:
Dra. Graciela Font, Univ. Nacional de La Plata;
Lic. José Frebrer, Instituto Antártico Argentino;
José Hormachea, Estación Astronómica Río
Grande, CONICET;
Dr. Eduardo Olivero, CADIC-CONICET
Lic. Jorge Strelin, Instituto Antártico Argentino, CADIC-CONICET
Lic. Daniel R. Martinioni, CADIC-CONICET.
b) Source of external money:
Agencia Nacional de Promocion Científica y Tecnológica,
Argentina.
c) Short report on activities and main results since September 1998:
The main objective of the study is the integration of geodetic (GPS),
gravimetric, magnetic, and seismologic measurements and results with geological
studies for geotectonic modeling of the Andes Fueguinos. The results of
a five year period of geodetic (GPS) measurement across the Magallanes-Fagnano
fault system are in good agreement with geological mapping of the area,
suggesting a general left-lateral strike-slip motion in the order of a
5 mm per year.
II) SANTONIAN-MAASTRICHTIAN STRATIGRAPHY, PALEONTOLOGY, AND SEDIMENTOLOGY OF THE JAMES ROSS BASIN, ANTARCTICA.
1) Title of Research Project:
Paleontology, Stratigraphy, and Sedimentology of Santonian-Maastrichtian
marine successions from the James Ross Basin, Antarctica. E. B. Olivero,
Director.
a) List of collaborators:
Dra. Andrea Choncheyro, micropaleontology (Nannoplancton), Univ. Buenos
Aires-CONICET
Dr. Roberto Scasso, sedimentology and stratigraphy, Univ. Buenos Aires-CONICET
Lic. Francisco Medina, stratigraphy and invertebrate paleontology,
CONICET;
Lic. Susana Palamarczuk, micropaleontology (palynology), CONICET;
Lic. Daniel R. Martinioni, general geology, stratigraphy, sedimentology,
CONICET.
b) Source of external money: Instituto Antartico Argentino
c) Short report on activities and main results since September 1998:
As a result of previous fieldwork in the basin we have published several
papers including a new stratigraphic framework for the sequences, a detailed
study of the complex sedimentary geometry of Maastrichtian beds in the
lower López de Bertodano Formation in Seymour and Snow Hill islands,
and a preliminary study concerning the diversity patterns of the Santonian
- Maastrichtian molluscan faunas.
2) List of publications since September 1998:
artinioni, D.R., Olivero, E.B. and Palamarczuk, S., 1998. Conglomerados
del Paleógeno en Tierra del Fuego: Evidencias de discordancia entre
el Cretácico Superior-(Paleoceno) y el Eoceno de Cuenca Austral.
Asociación Paleontológica Argentina. Publicación Especial
5. Paleógeno de América del Sur y de la Península
Antártica: 129-136.
Martinioni, D.R., Linares, E. and Acevedo, R.D., 1999. Significado
de la edad isotópica de diques básicos intruidos en la Formación
Beauvoir (Cretácico temprano), Tierra del Fuego, Argentina. Revista
de la Asociación Geológica Argentina, 54 (1): 88-91.
Olivero, E.B., 1998. Mesozoic-Paleogene geology of the Marginal-Austral
Basin of Tierra del Fuego. Field Trip Guide No. 3: 22-24 de Noviembre.
IGCP Project No 381. South Atlantic Mesozoic Correlations. Third Annual
Conference, Comodoro Rivadavia, Chubut Argentina. November 1998.
Olivero, E.B., 1998. Biodiversity changes and Paleobiogeography of
Late Cretaceous Antarctic marine faunas. Segundo Simposio Internacional
Artico-Antártico. ISAA 98 International Symposium on Artic and Antarctic
Issues. Punta Arenas Chile. 1-5 November 1998.
Olivero, E.B., 1998. Large mud-filled channels in the Maastrichtian
of the López de Bertodano Formation (Seymour Island, Antarctica):
Stratigraphical implications. Revista de la Asociación Geológica
Argentina (53 (4):553-556.
Olivero, E.B. and Malumián, N., 1999. Eocene Stratigraphy of
Southeastern Tierra del Fuego, Argentina. Bulletin of the American Association
of Petroleum Geologists (AAPG) 83 (2): 295-313.
Olivero, E.B. and Martinioni, D.R., 1998. A review of the Mesozoic-Paleogene
geology of the Andes Fueguinos. Isla Grande de Tierra del Fuego. Field
Trip Guide No. 3: 22-24 de Noviembre. IGCP Project No 381. South Atlantic
Mesozoic Correlations. Third Annual Conference, C. Rivadavia, Chubut Argentina.
November 1998.
Olivero, E.B., Barreda, V., Marenssi, S., Santillana, S. and Martinioni,
D.R., 1998. Estratigrafía, sedimentología y palinología
de la Formación Sloggett (Paleogeno continental), Tierra del Fuego,
Argentina. Revista de la Asociación Geológica Argentina,
53 (4): 504-516.
Olivero, E. B., Martinioni, D. R., Malumián, N. and Palamarczuk,
S., 1999. Bosquejo Geológico de la Isla Grande de Tierra del
Fuego, Argentina. XIV Congreso Geológico Argentino, Actas I: 291-294,
Salta, 1999.
Olivero, E.B., Martinioni, D.M., Mussel, F.A. and Robles, G.M., 1999.
Estratigrafía del Santoniano-Maastrichtiano, Grupo Marambio, Cuenca
James Ross, Antártida. Actas Cuartas Jornadas de Comunicaciones
sobre Investigaciones Antárticas. Instituto Antártico Argentino.
In press :
Olivero, E.B. and Martinioni, D.R.,, A review of the geology of the
Argentinean Fuegian Andes. In: Mesozoic Paleontology and Stratigraphy of
South America and the South Atlantic (P. Bengtson and E. A. M. Koutsoukos,
eds.) Special Issue of the Journal of South American Earth Sciences.
IGCP PROJECT 381 RESEARCH ACTIVITIES IN IVORY COAST
Reported by Dr. DIGBEHI Zeli Bruno (coordinator for IGCP Project
381 of the National University of Côte d'Ivoire) - Université
de Cocody, UFR des Sciences de la Terre et des Ressources Minières,
22 BP 582 Abidjan 22, Côte d'Ivoire - Tel: 225 44 29 34(office) 225
37 44 09 (home), 225 73 36 96( personal cell.), e-mail: digbehz@ci.refer.org
1. Report of main results:
The mains activities of stratigraphical studies in Côte d'Ivoire
are based on studies of foraminifera and palynomohs(palynology). The last
three years, with the intensification of prospective surveys realized by
foreign petroleum societies, numerous data are avaible in hese two disciplines.
But the amounts of data stay confidential.
Nethertheless, some data of public field have been published in journals:
N'DA L.V & St-MARC P., 1995. Données micropaléontologiques
du bassin ivoirien sur le passage Crétacé-Tertiaire. Revista
espagnola de microplaeontologia XXVII,3, pp 137-152.
DIGBEHIZ.B., YAO K.R., TEA Y.J, BOBLAI G., 1996. Contribution à
l'étude palynologique et paléoenvironnementale du Campanien
et du Maastrichtien du bassin offshore de Côte d'Ivoire. Géologie
Méditerranéenne Tome XXIII, n° 2, pp 115-171.
DGBEHI Z.B., N'DA L.V., YAO, K.R, ATTEBA A., 1997. Principaux
foraminifères et palynomorphes du bassin offshore de Côte
d'Ivoire, golfe de Guinée septentrional. (Propositions pour une
biozonation locale) African Geoscience Review, vol. 4, 1997 671-685.
St-MARC P. et N'DA L.V., 1997. Biostratigraphie et paléoenvironnements
des dépôts crétacés au large d'Abidjan, golfe
de Guinée. Cretaceous Research, 18, pp 545-565.
TEA, DIGBEHI, YAO, BOBLAI, ATTEBA, in press. Etude de quelques panomorphes
du Crétacé supérieur de Côte d'Ivoire. (Implications
biostratigraphiques et paléoenvironnementales) Journal of African
Earth Sciences.
IGCP PROJECT 381 RESEARCH ACTIVITIES IN CUBA
Centro de Investigaciones del Petroleo ( CEINPET)
Washington No. 169, Cerro, La Habana 12000, Cuba.
Reported by Jorge R. Sánchez (Regional Coordinator) (e-mail:
jsanchez@ceinpet.inf.cu)
l) RESEARCH PROJECTS:
---SYN-RIFT AND EARLY DRIFT JURASSIC CORRELATION EVENTS IN SOUTHEASTERN
GULF OF MEXICO AND WESTERN CARIBBEAN
Jorge R. Sánchez & Rafael Tenreyro
Short Report:
A comparison of the Lower to Middle Jurassic floras of Mexico, Cuba
and Honduras, and the lithological characteristics of the deposits in which
they occur, suggests a continuous progradation from inland to shallow marine
within a single Jurassic basin on the continental margin.
Elsewhere in the southern Gulf of Mexico Basin the salt has only be
reached in diapiric structures as the same in northern Cuba.
Comparisons among the basin sites of the DSDP Leg 77 in southeastern
Gulf of Mexico and the northern basinal sequences in Cuba, are in favour
the assumption that the first 0.4 sec. of the sequence below the earliest
Cretaceous, consists of deep water carbonates similar to those already
penetrated at the site 535.
Two flooding events during the Upper Jurassic are recorded on Cuba
continental margin: 1) during the Middle to Late Oxfordian, which is considered
to be equivalent to the establishment of the Smackover and Zuloaga (Novillo)
ramps in the Florida Panhandle and central/ northeast Mexico respectively;
2) during the Late Tithonian, related to the drowning out of Kimmeridgian
platforms and major transgressive episode.
---MID-CRETACEOUS BIOCHRONOLOGY FROM CUBA BASED ON PLANKTONIC MICROFOSSILS
Silvia Blanco
Short Report:
The deposits of Aptian-Cenomanian age in Cuba exhibit a rich fossil
assemblage in Cayo Coco 2 and Gloria 1 wells, both located in the northern
part of central Cuba. The assemblage was mainly composed of planktonic
foraminifers, subordinated benthonic foraminifers, Nannoconus
Colomiellidae, Pithonelloideae and Microcalamoids among others.
The fauna has a dominantly Tethyan character and shows close paleobiogeographic
relationship with the Gulf of Mexico, West Carpathians and Brazilian Atlantic
Margin notably through the common occurrence of Colomiellids and Pithonelloids.
As a result of the study of microfaunal succession, ten biozones of
planktonic foraminifers for the Aptian-Cenomanian interval were differentiated.
The high resolution biostratigraphy allowed to precise some geologic
events such as the Aptian age for the main transgression in the Cretaceous
of the southern edge of the Bahamas Platform. The Mesozoic biota typical
for that event are also present in north-central part of Cuba where the
transgression is recognized. This fact in association with a tectonic subsidence
gave rise to the development of the Cayo Coco paleochannel.
The study of the distribution, diversity and quality of the faunal
association made possible to differentiated the depletion in oxygen of
the water column as well as an estimation in the extension of the oxygen
minimum zone.
---APTIAN TRANSGRESSIVE EVENT IN THE CONTINENTAL MARGIN OF CUBA: REGIONAL
COMPARISONS / A REVIEW
Jorge R. Sánchez, Silvia Blanco, Rafael Tenreyro, Maritza Rodríguez
& Silvia
Valladares.
Short Report:
The Aptian represents a period of an important regional marine transgression,
which can be recognized in western and mainly central parts of the Cuban
continental margin, in platforms areas as well as in basin sites.
As a result of the relative sea-level rise (eustasy) and a gradually
tectonic subsidence a backstepping of the platform took place. The flooding
event gave the channel facies of the Guaney Formation (Aptian-Maestrichtian)
with deposition of pelagic sediments. The backstepping is clearly seen
on offshore seismic to the north of central Cuba and in deep wells located
near the coast in the Remedios Platform.
The marine event can also be observed in the well logging of the holes
drilled on the platform. In all cases an increase in the values of neutron,
gamma ray, resistivity and SP at the top of the Barremian-base of the Aptian
is clearly seen, which indicates a deposition of fine-grain rocks.
The scarceness of benthonic foraminifers both calcareous and agglutinated
forms suggests a development of anoxic or quasi-anoxic conditions at bottom.
In deeper settings the Neocomian carbonates rich in radiolarians, coccoliths,
nannoconids and ammonites are replaced by more oceanic facies with reddish
cherts and black shales.
Regional comparisons with coeval events in Southeastern Gulf of Mexico,
Bahamas Bank and Northern South Atlantic were reviewed. The facies changes
and consequently the different paleoenvironmental settings occurring during
the Aptian transgression were responsible for the composition of the biota.
The organic-rich black shales ranging from 2.20 to 14.90 TOC are proven
source rocks in the basin sites.
---BIOCONSTRUCTIONS IN CRETACEOUS DEPOSITS OF CUBA
Rolando García, Silvia Blanco, Rafael Segura, Evelio Linares
& Reinaldo Rojas.
Short Report:
Several formations related to bioconstructions in some Cretaceous deposits
of Cuba are found. These bodies represent marginal reefs of irregular form
whose debris are intercalated or transitional with other rocks.
The bioconstructions have been found in two particular settings: in
the northern carbonate platform(Remedios-Bahamas) and to the south in the
higher sites of the basins developed over the extinct Cretaceous volcanic
arc.
On the deposits of the platform sequence, the rudist-bearing and the
fossiliferous associations represented by algae and benthic foraminifers
are recorded at three levels: Lower Aptian, Cenomanian and Maestrichtian.
---FIRST REPORT ON CALCAREOUS CALPIONELLIDS FROM THE LOWER CRETACEOUS
(BERRIASIAN) OF THE TETHYAN PROVINCE IN ARGENTINE. PACIFIC-TETHYS CONNECTION
José Fernández (1) & Alberto Riccardi (2)
l) Centro de Investigaciones del Petróleo, La Habana, Cuba.
2) Museo La Plata, Argentine.
Short Report:
The studied area is located at the Neuquen Basin, in Alta Cordillera
Mendocina, Argentine.
Previously, the calcareous calpionellids have been found in black mudstones
of the Vaca Muerta Formation associated to the Jurassic-Cretaceous boundary.
Recently, the following fossil assemblage has been described in radiolarian
wackestone-fossiliferous mudstone: Calpionella alpina (small forms), Tintinnopsella
carpathica
(large forms), Nannoconus spp. and Cadosina fusca and abundant
radiolarian casts. The sequence corresponds to bathyal deposits based on
the radiolarians, other pelagic microfossils and dark pelites in euxinic
conditions.
The finding of Tethyan planktonic microfossils during the Berriasian
in Argentine allows to consider a broader biogeographic distribution. The
event is an indication of a marine communication that links distant paleogeographic
regions.
---UPPER CRETACEOUS OSTRACODES ASSEMBLAGES OF CENTRAL CUBA
(CEINPET-SEBIPE joint research project)
Coordinated by María Lizette Díaz-Collell (1), Marta
Claudia Viviers (2) & Jorge R. Sánchez(1)
1) Centro de Investigaciones del Petróleo, La Habana, Cuba.
2) Petrobras-Cenpes/ Divex/ Sebipe, Rio de Janeiro, Brazil.
Short Report:
Taxonomic and biostratigraphic studies of the ostracodes assemblages
recovered from Upper Cretaceous carbonate deposits (Via Blanca, Eloisa,
Cantabria and Jimaguayu Formations ) of central Cuba are in progress. More
specific differentiations on the ostracodes assemblages mainly in terms
of generic diversity and taxonomic correlation with the representants in
the Gulf Coast have been reached.
Several specimens of the genera Schuleridea, Cytherella, Cythereis,
Limburgina and Paijenborchellina will probably be established as new species.
Several plates with excellent SEM microphotos will be published.
OTHER RESEARCHES IN PROGRESS:
--- PALYNOLOGY OF THE UPPER JURASSIC IN CENTRAL CUBA
Marleny Blanco.
--- SEDIMENTARY MODELS OF DRIFTING TERRANES IN CENTRAL CUBA DURING THE
KIMMERIDGIAN-TURONIAN INTERVAL
Rafael Segura, Dania Brey & José Hernández.
---JURASSIC CARBONATE RESERVOIRS IN CUBA AND THEIR COMPARISONS
WITH THOSE IN SOUTHEASTERN MEXICO
Rafael Segura & Maritza Rodríguez.
2- Publications:
SANCHEZ, J.R. & TENREYRO, R. 1998. Syn-rift and early drift
Jurassic correlation events in southeastern Gulf of Mexico and western
Caribbean. Asoc. Pal.Golfo de San Jorge, Museo del Petroleo, Boletin 2,
ed. Especial, I, 29-32.
BLANCO, S. 1999. Mid-Cretaceous biochronology from Cuba based on planktonic
microfossils. 5th Brazilian Cretaceous Symp. / 1st South American Cretaceous
Symp., Sierra Negra, SP, August 29-Sept. 2, Extended Abstract.
FERNANDEZ, J. & RICCARDI, A. 1999. First report on calcareous calpionellids
from the Lower Cretaceous (Berriasian) of the Tethyan Province in Argentine.
Pacific-Tethys connection. 5th Bra-zilian Cretaceous Symp./ 1st South
American Cretaceous Symp., Sierra Negra, SP, August 29- Sept. 2, Extended
Abstract.
GARCIA, R., BLANCO, S., SEGURA, R. & LINARES, E. 1999. Bioconstructions
in Cretaceous sediments of Cuba. 5th Brazilian Cretaceous Symp. / 1st South
American Cretaceous Symp., Sierra Negra, SP, August 29 – Sept. 2, Extended
Abstract.
SANCHEZ, J.R., BLANCO, S., TENREYRO, R., RODRIGUEZ, M. & VALLADARES,
S. 1999.Aptian transgressive event in the continental margin of Cuba: Regional
Comparisons – A Review. 5th Brazilian Cretaceous Symp. / 1st South American
Cretaceous Symp., Sierra Negra, SP, August 29 – Sept. 2, Extended Abstract.
3- MEETINGS
---SAMC III Annual Conference, Comodoro Rivadavia, Argentine, November
17-20, 1998.
---SAMC IV Annual Conference, Sierra Negra, Sao Paulo, Brazil, August
29 – Sept. 2, 1999.
IGCP Project 381 RESEACH ACTIVITIES IN THE U.K.
Reported by Ray H. Bate (Ray_Bate@compuserve.com)
The volume, entitled "The Oil and Gas Habitats of the South Atlantic" - edited N. R. Cameron, R. H. Bate & V. S. Clure, Geological Society Special Publication No. 153, 474 pp., London, carries the IGCP 381 logo.
Ray Bate is working jointly with J E Whittaker of The Natural History
Museum, London, on a monograph of new Pre-Salt ostracods obtained from
the lacustrine deposits of West Africa.
IGCP Project 381 RESEARCH Activities in Germany
Reported by Peter Bengtson (German representative and co-leader
of IGCP 381)
University of Heidelberg, Germany (e-mail: Peter.Bengtson@urz.Uni-Heidelberg.de)
The following 30 workers based in Germany are registered as participants
of IGCP 381:
Baecker-Fauth, Simone (Universität Heidelberg)
Bandel, Klaus (Universität Hamburg)
Bebiolka, Anke (Technische Universität Berlin)
Bengtson, Peter (Universität Heidelberg; Project Co-Leader)
Bengtson, Suzana (Universität Heidelberg)
Boeger, Horst (Universität Kiel)
Carvalho, Marcelo de Araujo (Universität Heidelberg)
Fauth, Gerson (Universität Heidelberg)
Gebhardt, Holger (Technische Universität Berlin)
Graefe, Kai-Uwe (Universität Bremen)
Hay, William W. (GEOMAR, Kiel)
Herrmann, Achim (Universität Heidelberg; Penn State University)
Hildebrand-Habel, Tania (Universität Bremen)
Kiessling, Wolfgang (Universität Erlangen)
Koutsoukos, Eduardo A.M. (Universität Heidelberg; Petrobras, Rio
de Janeiro; Project Co-Leader)
Kowalczyk, Gotthard (Universität Frankfurt)
Kuhnt, Wolfgang (Universität Kiel)
Luther, Axel (Universität Heidelberg)
Mutterlose, Joerg (Universität Bochum)
Pletsch, Thomas (Universität Köln)
Reicherter, Klaus (Universität Hamburg)
Schlicht, Peter (Universität Heidelberg)
Schneider, Stefanie (Universität Heidelberg)
Seeling, Jens (Universität Heidelberg)
Seibertz, Ekbert (Universität Braunschweig)
Speijer, Robert P. (Universität Bremen)
Stinnesbeck, Wolfgang (Universität Karlsruhe)
Walter, Simone (Universität Heidelberg)
Wagner, Thomas (Universität Bremen)
Willems, Helmut (Universität Bremen)
Individual project involvement ranges from full research commitment to that of observer's status, with most participants showing medium to high activity.
Project administration
During the past year most of the manuscripts for the proceedings of
the 1977 joint Regional Meeting of IGCP 381 and the Second European Meeting
on the Palaeontology and Stratigraphy of South America in Heidelberg were
received by the editors P. Bengtson and E.A.M. Koutsoukos and sent out
for review. At the time of writing (September 1999), 3 manuscripts are
ready for publication, one is being reviewed, 7 are being revised after
reviewing and 6 are still to be submitted (of which 3 are uncertain). The
volume will be published as a thematic issue of the Journal of South American
Earth Sciences under the title "Mesozoic Palaeontology and Stratigraphy
of South America and the South Atlantic" and is expected to appear in mid
2000. The 17 contributions were listed in last year's annual report.
Editing of the manuscripts for the thematic volume “Mesozoic Biogeographical
Patterns in the South Atlantic”, to be published as a special issue of
Cretaceous Research, was concluded during the year and the volume is expected
to appear within the next few months.
Since last year's report, two annual project meetings have been held,
SAMC III in Comodoro Rivadavia, Argentina (November 1998), and SAMC IV
in Serra Negra, SP, Brazil (August-September 1999).
The Web site of IGCP 381, the SAMC Pages (http://www.rzuser.uni-heidelberg.de/~dc8/
samc/index.html), is managed by the project leaders from Heidelberg. An
electronic mailing list (SAMC-Net) is available for information and on-line
discussions among project participants.
Research activities
In the following, research projects carried out by participants active
in Germany and of relevance to IGCP 381 are listed, as reported by September
1999. A number of projects are being carried out in collaboration with
workers outside Germany.
Berlin
- Integrated biostratigraphy, palaeoecology and palaeobiogeography
of the Nkalagu Formation (Cenomanian to Coniacian, southern Nigeria): foraminifera,
ostracods, inoceramids, ammonites and calcareous nannofossils (H. Gebhardt;
Habilitation-Thesis). - Project funded by DAAD, the German Academic Exchange
Service.
The project stems from German-Nigerian co-operation (the former VW-Foundation-sponsored
project "Thermal and burial history of Cretaceous and Tertiary deposits
in the Benue Trough (middle and upper regions), Nigeria" and a DAAD long-term
lectureship of Gebhardt at the University of Ilorin, Nigeria).
Micro- and macrofossil assemblages of three sections of the Nkalagu
Formation (Cenomanian to Coniacian, southern Nigeria, Lower Benue Trough),
including the type-section of the formation, have been investigated qualitatively
and quantitatively. Depositional models have been developed from sedimentological
and palaeontological datasets. Biostratigraphic zonation schemes for several
fossil groups have been erected, integrated and correlated with international
standard zonations (high resolution biostratigraphy).
The following biozones have been identified: Planktonic foraminifers:
Praeglobotruncana cf. stephani Zone (?middle Turonian), Marginotruncana
sigali Zone (upper Turonian), Dicarinella primitiva Zone (uppermost Turonian),
Dicarinella concavata Zone (Coniacian). Benthic foraminifers: Planulina
beadnelli (=Gavelinella dakotaensis)-Ammoastuta nigeriana Zone (Cenomanian
to lower Santonian). Calcareous nannofossils: Eiffellithus eximius Zone
(middle Turonian to basal upper Turonian), Marthasterites furcatus Zone
(upper Turonian to Coniacian). Ostracods: Cytherella spp. Zone (uppermost
Cenomanian), Cythereis vitiliginosa reticulata Zone (?middle to upper Turonian),
Cythereis sp. 2 Zone (uppermost Turonian to Coniacian). Inoceramids and
ammonites confirm the age assignments of the zones. Integration of fossil
groups allows separation of six preliminary integrated zones (IZ-A
to IZ-F), with an average duration of about 0.4 Ma. IZ-A: uppermost
Cenomanian, IZ-B: ?middle Turonian, IZ-C: (?basal) upper Turonian, IZ-D:
middle upper Turonian, IZ-E: uppermost Turon, IZ-F: Coniacian. The Turonian-Coniacian
boundary is dicussed in detail on the basis of biological events. As an
easily identifiable marker for the base of the Coniacian, the first occurrence
of Dicarinella concavata is proposed.
The sections studied represent a deepening sequence, coincident with
an increase in oxygen content of the bottom waters. During the latest Cenomanian
sediments were deposited in a dysoxic to maximally suboxic, normal marine
environment of an inner shelf area near the coastline. The middle(?) Turonian
to Coniacian sediments were deposited in the upper bathyal zone under normal
marine salinity and low oxic conditions of the bottom waters. Fluctuations
of the epifauna/infauna ratio among benthic foraminifers indicate unstable
oxygen contents of the bottom waters. Positive peaks of epifaunal elements
and calcareous species are interpreted as ventilation events. The rarity
of keeled planktonic foraminifers and the dominance of unkeeled opportunistic
species with early reproductive maturity are explained by (1) very high
surface productivity through (possible) eutrophication of surface waters
and (2) possible fluctuations of surface salinity and/or changes of depth
of an oxygen-minimum zone. The varying degrees of oxygenation in the sections
studied are caused by different processes. Cenomanian shallow-marine deposits
were loaded with high amounts of organic matter via river systems and suffered
oxygen deficiency, possibly in connection with density stratification.
Middle(?) Turonian to Coniacian deposits are characterized by high surface
productivity and a high organic flux into the sediment as the cause for
low oxygen contents within the sediment and high bottom productivity.
Palaeobiogeographic links of the area investigated have revealed that
planktonic foraminifers and calcareous nannofossils show a clear tethyan
influence, thus indicating warm waters. Agglutinated foraminifers show
endemic tendencies at species level, which is related to the Benue Trough.
Calcareous smaller benthic foraminifers are generally pandemic and restricted
in their distribution only by facies differences. Marine ostracods are
generally endemic (West African Province).
The data and interpretations provide a basis for basinwide correlation
in the Lower Benue Trough and in parts also for its middle and upper regions.
They allow a direct correlation with other West African basins and with
worldwide biostratigraphic zonal schemes. This study demonstrates the applicability
of the morphotype/microhabitat-model of benthonic foraminifers also for
Cretaceous times.
Publications:
Gebhardt, H., 1999. Occurrence and palaeoecology of Cenomanian to Turonian
ostracods from Ashaka (NE Nigeria). Neues Jahrbuch für Geologie und
Palaeontologie, Abhandlungen 211(1), 133-149.
Gebhardt, H. , 1999. Cenomanian to Coniacian biogeography and migration
of North and West African ostracods. Cretaceous Research 20(1), 215-229.
Gebhardt, H. & Reinhold, C., 1999. Carbon and oxygen isotope
data from the Cenomanian-Turonian boundary in the Upper Benue Trough (Ashaka,
Nigeria): stratigraphic and paleoclimatological significance. Newsletters
on Stratigraphy 37(1/2), 63-74.
Gebhardt, H.,1999. Cenomanian to Coniacian ostracodes from the Nkalagu
Area (SE Nigeria): biostratigraphy and palaeoecology. Paläontologische
Zeitschrift 73(1/2), 77-98.
Gebhardt, H., 1999. Biogeographie und Ausbreitungswege West- und Nordafrikanischer
Ostracoden. In: Treffen deutschsprachiger Ostracodologen 1999 [22.-23.05.1999],
Museum für Naturkunde, Berlin.
Gebhardt, H., 1999. Integrierte Biostratigraphie und Palaeooekologie
der Nkalagu Formation (Suednigeria, Cenoman - Coniac): Foraminiferen, Ostracoden,
Inoceramen, Ammoniten und kalkiges Nannoplankton. Terra Nostra 99(4), 78-79.
Gebhardt, H., 1999. Cenomanian to Coniacian biogeography and migration
of North and West African ostracods. Afrikagruppe deutscher Geowissenschaftler
(AdG), Jahrestreffen 1999, Würzburg, Abstracts.
Braunschweig
- Middle Cretaceous of Mexico (E. Seibertz).
Publication:
Seibertz, E. & Spaeth, C., 1999. Range and distribution of belemnites
in the Jurassic and Cretaceous of Mexico - a progress report. In: V International
Symposium "Cephalopods – Present and Past", Abstracts volume, p. 102.
Bremen
- Development of South Atlantic calcareous dinoflagellates since
the Late Cretaceous (T. Hildebrand-Habel, H. Willems).
Calcareous dinoflagellates dominate the dinoflagellate cyst assemblage
in many Cretaceous to Recent oceanic deposits. However, their temporal
and spatial distribution patterns in the Mesozoic and Cenozoic South Atlantic
have been little studied. We therefore investigated the calcareous dinoflagellate
content of three South Atlantic DSDP/ODP cores (Sites 356, 357, and 689B).
Distinct stratigraphic and lateral differences were identified in the time-interval
from early Maastrichtian to late Miocene.
The associations and characteristic wall types fluctuate quantitatively
and qualitatively in stratigraphic patterns. The associations exhibit significant
shifts at certain stratigraphic boundaries, particularly at the K-T boundary,
the Eocene-Oligocene boundary, and the Oligocene-Miocene boundary. The
distribution of calcareous dinoflagellates is evidently controlled by external
factors, most likely related to climatic changes. Only minor latitudinal
differences are observed prior to the late Paleocene. Radially structured
taxa are possibly better adapted to conditions of higher latitudes, i.e.
lower temperatures, less insolation, and higher nutrient contents.
Our study illustrates the sensitive reaction of calcareous dinoflagellates
to changing environmental conditions. The organisms thus represent a proxy
for palaeoecological and palaeoceanographic reconstructions.
Erlangen
- Late Jurassic-Early Cretaceous Radiolaria from Antarctica
as a key to understanding mid Mesozoic palaeoceanography (W. Kiessling).
For project description, see last year's report.
Hamburg
- Reevaluation of the Maastrichtian Quiriquina fauna of Central
Chile, especially the gastropods (K. Bandel, W. Stinnesbeck, in collaboration
with A. Quinzio). For project description, see last year's report.
- Geochemical correlation of late Cretaceous and early Cenozoic ashes from the Blake Nose transect (ODP Leg 171B) with the volcanic sequence of eastern Cuba (K. Reicherter, T. Pletsch, in collaboration with D. Garcia Delgado, J. Sanchez-Arancho, J. Smit). For project description, see last year's report.
- Evidence for a synchronous circum-Iberian subsidence event and
its relation to African-Iberian collision in the Upper Cretaceous (K.
Reicherter, T. Pletsch).
Sedimentary facies, clay minerals, and benthic foraminiferal assemblages
in deep-water formations of the Subbetic Zone (Spain) display significant
changes in the Late Cretaceous. Calculated subsidence curves for the Subbetic
Mesozoic sedimentary sequences point either to a pronounced uplift or to
a drowning event around 85 Ma. Data from other localities around the Iberian
microplate and from adjacent areas in the eastern Atlantic (off Morocco,
Gulf of Guinea) with settings on different types of lithosphere, revealed
the same general pattern of a major break or uplift in, or strongly enhanced
rates of, subsidence around this time (e.g. variations depending on stratigraphic
resolution, the time-scale applied, porosity and paleo-waterdepth estimates).
At most localities, the subsidence events correlate with changes in
the bulk sedimentary and clay mineral composition. Notably, where uplift
is indicated, the relatively monotonous, smectite-dominated clay mineral
assemblages are replaced by assemblages indicating either massive erosion
of residual deposits or first-cycle weathering of crystalline rocks, i.e.
kaolinite, chlorite, and illite. The opposite trend was observed at localities
characterized by increased subsidence.
Subduction or collision-related high-pressure metamorphism occured
at about 90-80 Ma in the western Mediterranean region (i.e., the Internal
Zone of the Betic Cordillera, the Moroccan Rif and the Kabylies) and preceded
the regional Alpine metamorphism. A Late Cretaceous metamorphic event is
also known from the Benue Trough (central Africa). Literature on the timing
of these metamorphic events suggests a synchroneity of high-pressure metamorphism
with the subsidence changes.
We assume that the subsidence history of the circum-Iberian basins
was largely controlled by the convergence of the northern West African
plate margin and the Iberian microplate, however, with certain impact on
the opening of the Atlantic. Plate tectonic reconstructions suggest that
the northward movement of Africa was largely controlled by the opening
of the South Atlantic during the mid-Cretaceous. However, a change in the
plate motion vector of Africa at 85 Ma, with a faster eastward movement
afterwards may indicate that Africa became locked towards the North. Collision
of Iberia and Africa is thought to be responsible for the uplift events
in basins lying in the direction of movement of Africa.
Aside from plate tectonic implications, the closure of the seaway connecting
the Tethys with the Central Atlantic probably had dramatic effects on oceanic
circulation. The almost continuous tropical to subtropical circulation
along the Tethys and the Central Atlantic is considered an influential
precondition of mid-Cretaceous greenhouse climate. Blocking or deviation
of the warm, westward-flowing Tethyan surface waters may have engendered
a significant change in the global circulation pattern, thus potentially
leading to climatic cooling from 80 Ma on.
Publication:
Reicherter, K. & Pletsch, T. , 1999. Evidence for the synchroneity
of a circum-Iberian subsidence event and the beginning African-Iberian
continental collision in the Upper Cretaceous. Terra Abstracts, J. Conf.
Abs., 4, 1, 63; Cambridge, U.K.
Heidelberg
- The Cenomanian-Turonian boundary in northeastern Brazil: high-resolution
stratigraphy and palaeoenvironmental evolution (P. Bengtson, E.A.M.
Koutsoukos, J. Seeling, S. Walter, A. Herrmann). - Project funded by DFG,
Deutsche Forschungsgemeinschaft. Subprojects:
(a) Palaeontology and biostratigraphy of the Cenomanian-Turonian
boundary in the Sergipe Basin (J. Seeling, P. Bengtson).
Taxonomic work on the bivalves and echinoids has been completed and
manuscripts have been submitted or are in draft stage. Taxonomic work on
the ammonites is in progress. A PhD thesis by J.S. to be submitted in December
1999 includes (1) taxonomy of bivalves and echinoids; (2) a new inoceramid
zonation and a refined ammonite zonation, which are correlated with other
regions and the proposed GSSP in Colorado, USA; (3) interpretation of the
palaeoecology and palaeobiogeographic affinities of the macroinvertebrate
faunas.
Publication:
Seeling, J. & Bengtson, P., in press. Cenomanian oysters from the
Sergipe Basin, northeastern Brazil. Cretaceous Research 20(6).
(b) Environmental and facies analysis of the Cenomanian-Turonian
transition in the Sergipe Basin (S. Walter, P. Bengtson).
On the basis of sections studied in the outcrop areas of Japaratuba,
Laranjeiras and Itaporanga a facies model has been established. The limestone
succession was subdivided in a mid-ramp and an outer-ramp depositional
environment. Bioclastic material was brought in by currents as evidenced
by coquinoid layers in the Japaratuba and Laranjeiras area. Both areas
represent a carbonate mid-ramp area. The succession exposed in the Itaporanga
area was deposited in an outer ramp environment as evidenced by fine-grained
laminated limestones and a scarcity of benthic organisms, which indicate
low oxygen conditions.
In addition to microfacies analysis stable carbon and oxygen isotopes
are being analyzed in collaboration with M. Arthur and A. Herrmann (Penn
State University). The carbon curve for the three outcrop areas will be
intercalibrated and correlated with the curve tied to the international
stratigraphic scale in order to aid in recognizing the Cenomanian-Turonian
boundary in Sergipe.
Publication:
WALTER, S., HERRMANN, A. & BENGTSON, P., in press. Stratigraphy
and facies analysis of the Cenomanian-Turonian boundary succession in the
Japaratuba area, Sergipe Basin, Brazil. Journal of South American Earth
Sciences.
- Aptian-Maastrichtian ammonites and integrated biostratigraphy of
northeastern Brazil (P. Bengtson, E.A.M. Koutsoukos). - Subprojects:
(a) Biostratigraphic correlation of the upper Aptian-Albian succession
of northeastern Brazil on the basis of ammonites and foraminifers (P.
Bengtson, E.A.M. Koutsoukos).
Results of this subproject will be published in the volume of proceedings
of the 1997 Regional Meeting of IGCP Project 381, in Heidelberg.
(b) Campanian ammonites and inoceramids from the Sergipe Basin
(P. Bengtson, E.A.M. Koutsoukos, in collaboration with W. Souza-Lima, K.-A.
Tröger, J. Burnett, M.H. Zucon).
Publications:
Souza-Lima, W. & Bengtson, P., 1999. Evidence for cold-water currents
and upwelling in the late Campanian of the Sergipe Basin, Brazil. In: XVI
Con-gresso Brasileiro de Paleontologia [Crato, August 1999], Resumo das
comunicações.
(c) Ammonite taxonomy and biostratigraphy of northeastern Brazil
(P. Bengtson, S. Bengtson). - Long-term project. For project description,
see last years's report.
Publications:
Bengtson, P., 1999. Research on Cretaceous ammonites of Brazil in the
20th century and the state of the art. In D. Dias-Brito, J.C. de Castro
& R. Rohn: Boletim do 5° Simpósio sobre o Cretáceo
do Brasil, 1er Simpósio sobre el Cretácico de América
del Sur, 591–598. UNESP, Rio Claro, SP.
Souza-Lima, W. & Bengtson, P. 1999. O amonóide Cleoniceras
no Albiano inferior da Bacia de Sergipe, Brasil. In D. Dias-Brito, J.C.
de Castro & R. Rohn: Boletim do 5° Simpósio sobre o Cretáceo
do Brasil, 1er Simpósio sobre el Cretácico de América
del Sur, 583–589. UNESP, Rio Claro, SP.
- Marine ostracodes of northeastern Brazil: systematics, biostratigraphy
and biogeography (P. Bengtson, G. Fauth, E.A.M. Koutsoukos, in collaboration
with M.C. Viviers). Subprojects:
(1) Ostracode assemblages across the Cretaceous-Tertiary boundary
in the Pernambuco-Paraiba Basin, northeastern Brazil: systematics, biostratigraphy
and palaeo-environ-ments (G. Fauth, P. Bengtson, E.A.M. Koutsoukos).
- Project funded by DAAD, the German Academic Exchange Service.
For project description, see last year's report. The project is expected
to be concluded in early 2000.
Publication:
Koutsoukos, E.A.M. & Fauth, G., in press. Stratigraphic record
and depositional dynamics of an impact-triggered tsunami event in the early
Danian: the K/T boundary section at Poty, NE Brazil. Geological Society
of America Annual Meeting [Denver, October 25–28, 1999].
(2) Stratigraphy and biogeography of mid and late Cretaceous ostracodes
of northeastern Brazil (E.A.M. Koutsoukos, P. Bengtson, in collaboration
with M.C. Viviers, A.C. Silva-Telles, Jr.).
Publication:
Viviers, M.C., Koutsoukos, E.A.M., Silva-Telles Jr., A.C. & Bengtson,
P., in press. Late Aptian-Campanian ostracodes from the Potiguar
and Sergipe basins, northeastern Brazil: stratigraphy and biogeographic
affinities. Cretaceous Research.
- Palynostratigraphy and palynofacies reconstruction of the upper
Aptian-lower Albian of the Sergipe Basin, northeastern Brazil (M.A.
Carvalho, P. Bengtson, E.A.M. Koutsoukos). - Project funded by DAAD, the
German Academic Exchange Service. For project description, see last year's
report.
- Magnetostratigraphy and rock magnetism of uppermost Cretaceous
sedimentary successions and the Cretaceous-Tertiary boundary in northeastern
Brazil (P. Schlicht, P. Bengtson, E.A.M. Koutsoukos, in collaboration
with K. Krumsiek, U. Hambach). - Project funded by DFG, Deutsche Forschungsgemeinschaft.
In this project geophysical and geochemical data sets are utilized
to establish stratigraphic timescales for the Upper Cretaceous marine successions
of the northeastern Brazilian basins. The data will be correlated with
existing biostratigraphic data and finally with global timescales. Magnetostratigraphy
and the analysis of sedimentary cycles by using rock magnetic and geochemical
parameters provide ages and time contents of the investigated strata. Geological
ages are determined through analyses of directional data, i.e. declination
and inclination, and their subsequent correlation with the geomagnetic
polarity time scale (GPTS). Time durations and sedimentation rates will
be analysed using modern methods of cyclostratigraphy. Investigations of
the frequency content of sedimentary cycles are carried out in order to
find frequency bands that correlate with the astronomical frequencies,
i.e. the Milankovitch periods. Together with high-resolution sampling we
attempt to establish high-resolution timescales which are of a much higher
precision than that which can be obtained by the use of magneto- or biostratigraphic
methods alone. Knowing the time content of the marine Cretaceous successions
exposed in the northeastern Brazilian basins, the evolution of the South
Atlantic Ocean can be reconstructed more precisely. In addition we expect
information about climatic variations affecting the paleogeography and
paleoceanography of the investigated time interval.
Publication:
Schlicht, P., Bengtson, P., Hambach, U., Krumsiek, K. & Koutsoukos,
E., 1999. Limestone–marl cycles from the Maastrichtian of the Pernambuco–Paraíba
Basin (NE Brazil) - evidence for orbital forcing? In D. Dias-Brito, J.C.
de Castro & R. Rohn: Boletim do 5° Simpósio sobre o Cretáceo
do Brasil, 1er Simpósio sobre el Cretácico de América
del Sur, 121–124. UNESP, Rio Claro, SP.
- Late Cretaceous radiolarian palaeoceanography and biostratigraphy in the equatorial Atlantic Ocean (S. Baecker Fauth, P. Bengtson, in collaboration with V. Brasil-Lemos). For project description, see last year's report.
- Cretaceous macropalaeontology, biostratigraphy and palaeoecology
of Antarctica (P. Bengtson, A. Luther, S. Bengtson). - Subprojects:
(a) Upper Cretaceous palaeoecology and sedimentology of the James
Ross Basin, Antarctic Peninsula (A. Luther, P. Bengtson, in collaboration
with the British Antarctic Survey).
This subproject concerns palaeoecological, palaeontological and biostratigraphical
investigations in the Upper Cretaceous of the Admiralty Sound area, James
Ross Basin, Antarctica and was concluded in early 1999 with a PhD thesis
by A.L. A number of papers are now being prepared for publication containing
the main results of the project as follows:
Thirty-five taxa of ichnofossils, macrofossils and microfossils are
described from the mid-Campanian Rabot Member and the upper Campanian Hamilton
Point Member (Santa Marta Formation) of southeastern James Ross Island.
Seven species and one genus are new.
The last inoceramid bivalves in are represented by an unusual giant
form, Antarcticeramus rabotensis Crame and Luther, 1997, which is extremely
abundant at certain levels within the Rabot Member. The majority of specimens
are in life position and show a preferred orientation with respect to a
horizontal substrate (longitudinal axis parallel to the current). This
is taken as evidence of a positive response to prevailing water currents.
Associated macrofossils and trace fossils indicate well oxygenated bottom
conditions at mid-shelf depths. It is postulated that the evolution of
giant size was primarily an antipredatory device.
Specimens of A. rabotensis are hosts of a rich and diverse ichnofossil
assemblage which occur on the surfaces of the internal moulds and within
the shell. Some of the borings in the shell were produced by parasitic
and/or commensalic organisms. Although the negative influence of these
organisms was not lethal, it must have deteriorated the living conditions
of the host. The traces on the mould surfaces resemble members of the Nereites
ichnofacies. However, owing to the poor preservation and the unusual occurrence
within a shell cavity in a mid to outer shelf environment, these traces
are described as problematica.
The traces in the host sediment of A. rabotensis represent a typical
shallow-marine ichnofauna, which can be subdivided into a pre- and post-storm
event assemblage. The Rabot Member contains a shallow-water occurrence
of Zoophycos. Ichnofossil diversity is low throughout the section. The
majority of ichnotaxa are concentrated in two horizons, whereas the remaining
section is mainly dominated by Chondrites.
The Hamilton Point Member contains a benthic community which exhibits
a notably low taxonomic diversity and (for most taxa) abundance. The ichnofossil
assemblage shows a similarly low diversity with five genera dominated by
Chondrites and Planolites. The systematic and biostratigraphic potential
of the serpulid Rotularia in the James Ross Basin is re-evaluated and the
stratigraphic ranges of the bivalve Thyasira townsendi and the crinoid
Isselicrinus antarcticus are extended down to the mid Campanian. Rotularia
proved to be a powerful tool for intrabasinal correlation, allowing subdivision
of the Hamilton Point Member into a dorsolaevis Zone and a callosa Zone.
It is suggested that the low diversity and partly low abundance of
the Hamilton Point Member is the result of short-term dysaerobic conditions
caused by either episodic eutrophic conditions or storm-influenced, short-term
oxygenation of dysaerobic stagnant bottom water. It could also be demonstrated
that the frequency distribution of Rotularia and the grain size distribution
of the substrate are not correlated, as postulated by Macellari (1984),
but that there is a correlation between frequency and body size of Rotularia
within the Hamilton Point Member.
Massive calcareous peduncles and capitular plates are described and
referred to the new cirripede species Euscalpellum lanceolatum Luther and
Bengtson in prep. They represent the only definite, Cretaceous occurrence
of capitular plates of Euscalpellum in the southern hemisphere. It is unlikely
that these cirripedes lived on or in the soft substrate of the Hamilton
Point Member, and an alternative lifestyle attached to floating driftwood
is suggested.
Eleven species (of which four are new) belonging to nine genera of
ostracods are described from the Hamilton Point Member (Fauth & Luther,
in prep.). This is the first taxonomic work on ostracods from the James
Ross Basin. The assemblage shows similarities with those of ichnofossils
and benthic macrofossils, i.e. low diversity and low abundance. Two of
the species are known from the upper Campanian-lower Maastrichtian of South
America and South Africa.
Publication:
Luther, A., 1999:. Palaeoecological, taxonomical, biostratigraphical
and sedimentological investigations in the Upper Cretaceous of southeastern
James Ross Island, Antarctic Peninsula, Antarctica. 170 pp., 54 figs. Ph.D.
dissertation, Universität Heidelberg.
(b) Upper Cretaceous Ostracodes of the James Ross Basin, Antarctic
Peninsula (A. Luther). – Application for DFG funding under review.
This subproject is planned to start by the end of the year and will
comprise the first comprehensive taxonomic study and paleoecologic analysis
of Cretaceous ostracodes of Western Antarctica.
(c) Ammonites of the genus Spiticeras from Livingston Island, South Shetland Islands, Antarctica (S. Bengtson, in collaboration with M.R.A. Thomson).
Kiel
- The Santa Maria sequence in southern Brazil and its eolian frame:
sedimentology, palaeoecology and palaeogeography of an aquatic sedimentary
trough within the Botucatu desert during the Kazanian–Norian interval
(H. Böger, G. Kowalczyk). For project description, see last year's
report.
Köln
- The opening of the Equatorial Atlantic Gateway and its impact
on Cretaceous-Paleogene climate, circulation, biogeography, and organic
carbon accumulation (T. Pletsch, in collaboration with J. Erbacher,
A. Holbourn, W. Kuhnt, M. Moullade, F. Oboh-Ikuenobe, E. Soeding, T. Wagner).
- Project funded until mid 1997 by DFG, German Research Council.
The sedimentology, clay mineralogy, organic geochemistry, and the palaeoecology
of microfossil groups (benthic foraminfers, radiolarians, palynomorphs)
of Cretaceous deposits from the Côte d´Ivoire-Ghana Transform
Margin (ODP Leg 159) have been studied. Laboratory work is completed. Publications
of results are under way focusing on the subsidence history and thermal
maturity.
Publications:
Wagner, T. & Pletsch, T., 1999. Tectono-sedimentary controls on
Cretaceous black shale deposition along the opening Equatorial Atlantic
Gateway (ODP Leg 159). In N. Cameron, R. Bate & V. Clure (eds):
The Oil and Gas Habitat of the South Atlantic. Geological Society [of London],
Special Publication 153.
Holbourn, A., Kuhnt, W., El Albani, A., Pletsch, T., Luderer, F. &
Wagner, T., 1999. Upper Cretaceous palaeoenvironments and benthic foraminiferal
assemblages of potential source rocks from the western African margin,
Central Atlantic. In N. Cameron, R. Bate & V. Clure (eds): The Oil
and Gas Habitat of the South Atlantic. Geological Society [of London],
Special Publication 153.
Pletsch, T., Erbacher, J., Holbourn, A., Kuhnt, W., Moullade, M., Oboh-Ikuenobe,
F., & Wagner, T., in review. Cretaceous separation of Africa and South
America: The view from the West African margin (ODP Leg 159). Journal of
South American Earth Science.
- Ocean-continent coupling in sedimentary cycles of mid-Cretaceous
organic-rich deposits of the Central and Equatorial Atlantic (P. Hofmann,
T. Pletsch, and W. Ricken, in collaboration with J. Erbacher, W. Kuhnt,
R. Norris, E. Soeding, T. Wagner, H. Weissert, P. Wilson). – Submission
of a grant proposal will depend on decision to drill the Demerara Rise.
The Demerara Rise off Surinam provides favourable conditions for drilling
a transect that includes mid-Cretaceous deposits at shallow burial depth.
Should this transect be drilled by ODP, we plan to study the sedimentology,
mineralogy, organic geochemistry, and the micropalaeontology of selected
cyclic intervals. The results will be compared with existing studies on
coeval deposits from the Central and Equatorial Atlantic. Current work
consists of compilation of results from adjacent DSDP and ODP sites.
HATHWAY, Benjamin - School of Earth and Environmental Science, University of Greenwich, Medway Campus, Pembroke, Chatham Maritime, Kent ME4 4TB, UK Tel.: +44 0181 331 9800; fax: +44 0181 331 9805; e-mail: B.Hathway@greenwich.ac.uk Research interests: Cenomanian sequence stratigraphy of NE Brazil and SE India, and Cretaceous of the Antarctic Peninsula.
NOUBHANI, Abdelmajid - CHOUAÏB DOUKKALI University, Sciences Faculty, Dept.of Geology, B.P. 20 El Jadida, MOROCCO. Tel.: (03) 34 23 25 / (03) 34 30 03; fax : (03) 34 21 87; e-mail: anoubhani@hotmail.com Research interests: The Cretaceous and Tertiary Sélacians (sharks and rays); systematics, evolution and implications in the examination of the biological crisis impact at the K-T boundary.
PLETSCH, Thomas Pletsch - Geologisches Institut, Universitaet
Koeln, Zuelpicher Str. 49a, 50674 Koeln, GERMANY.
Tel.: +49-(0)221-470 6694; fax: +49-(0)221-470 5149; e-mail:
thomas.pletsch@uni-koeln.de
TISI, Antonio Luis - e-mail: antonio.l.tisi@shell.com.br
We would like to express our gratitude to PETROBRAS-CENPES,
Rio de Janeiro, for support involved in editing, photocopying and mailing
all the copies of SAMC News 15.