Résultats préliminaires sur la sédimentation pélagique de l'Atlantique tropical au Crétacé et au Tertiaire (plateau de Demerara,Leg ODP 207)期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Résultats préliminaires sur la sédimentation pélagique de l'Atlantique tropical au Crétacé et au Tertiaire (plateau de Demerara,Leg ODP 207)

Authors:	Taniel Danelian Laurence Le Callonnec Jochen Erbacher David C Mosher Mitchell J Malone Debora Berti Karen L Bice Helen Bostock Hans-Jürgen Brumsack Astrid Forster Felix Heidersdorf Jorijntje Henderiks Thomas J Janecek Christopher Junium Ken MacLeod Philip A Meyers Jörg H Mutterlose Hiroshi Nishi Christine Glatz

Institution:	1. « Paléobiodiversité et Paléoenvironnements », UMR 5143 CNRS, département de géologie sédimentaire, université Paris-6, C 104, 4, place Jussieu, 75252 Paris cedex 05, France;2. JE « Biominéralisations et Paléoenvironnements », FR32 CNRS « Cépage », département de géologie sédimentaire, université Paris-6, C 116, 4, place Jussieu, 75252 Paris cedex 05, France;3. Bundesanstalt für Geowissenschaften und Rohstoffe, Meeresgeologie und Tiefseebergbau, Stilleweg 2, 30655 Hannover, Allemagne;4. Bedford Institute of Oceanography, Geological Survey of Canada, P.O. Box 1006, Dartmouth, NS B2Y 4A2, Canada;5. Integrated Ocean Drilling Program, Texas A&M University, 1000 Discovery Drive, College Station, TX 77845-9547, États-Unis;6. Department of Oceanography, Texas A&M University, Mail Stop 3146, College Station, TX 77843, États-Unis;7. Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Mail Stop 23, Woods Hole, MA 02543, États-Unis;8. Department of Earth and Marine Sciences, The Australian National University, Canberra, ACT 0200, Australie;9. Institut für Chemie und Biologie des Meeres (ICBM), Carl-von-Ossietzky-Universität Oldenburg, Postfach 2503, 26111 Oldenburg, Allemagne;10. Royal Netherlands Institute for Sea Research (Royal NIOZ), Department of Marine Biogeochemistry and Toxicology, P.O. Box 59, 1790 AB Den Burg, Texel, Pays-Bas;11. Department of Geosciences, University of Bremen, Marine Technology/Environmental Research, Klagenfurter Strasse, 28359 Bremen, Allemagne;12. Department of Geology and Geochemistry, Stockholm University, Svante Arrheniusväg 8C, 10691 Stockholm, Suède;13. Antarctic Research Facility, Florida State University, Tallahassee, FL 32306-4100, États-Unis;14. Department of Geosciences, Pennsylvania State University, 543 Deike Building, University Park, PA 16801, États-Unis;15. Department of Geological Sciences, University of Missouri-Columbia, Columbia, MO 65211-1380, États-Unis;p. Department of Geological Sciences, University of Michigan, 2534 C.C. Little Building, Ann Arbor, MI 48109-1063, États-Unis;q. Institut für Geologie, Mineralogie und Geophysik, Ruhr Universität Bochum, Universitätsstrasse 150, 44801 Bochum, Allemagne;r. Graduate School of Social and Cultural Studies, Kyushu University, 4-2-1 Ropponmatsu, Chuo-Ku, Fukuoka 810-8560, Japon;s. Scripps Institution of Oceanography, Mail Stop 0244, La Jolla, CA 92093-0244, États-Unis;t. Department of Earth and Atmospheric Sciences, Purdue University, 1397 Civil Building, West Lafayette, IN 47907-1397, États-Unis;u. Graduate School of Oceanography, University of Rhode Island, Narragansett Bay Campus, Narragansett, RI 02882, États-Unis;v. Department of Geology, University of Leicester, Leicester LE1 7RH, Royaume-Uni;w. School of Ocean and Earth Sciences, Southampton Oceanography Centre, European Way, Southampton SO14 3ZH, Royaume-Uni;x. Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, États-Unis;y. Department of Ocean Floor Geoscience, University of Tokyo, 1-15-1 Minamidai, Nakano-Ku, Tokyo 164-8639, Japon;z. Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, Royaume-Uni;11. School of Ocean and Earth Sciences, Southampton Oceanography Centre, European Way, Southampton SO14 3ZH, Royaume-Uni;12. Department of Geological Sciences, 4100, Florida State University, Tallahassee, FL 32306-4100, États-Unis;13. 3703 Sandy Forks, Kingwood, TX 77339, États-Unis

Abstract:	Five sites located on a bathymetric transect of the distal Demerara Rise were studied by ODP Leg 207. Albian sediments of essentially terrigenous nature (clay, siltstone, sandstone) are the oldest drilled stratigraphic levels and form apparently the top of the synrift sequence. They are overlain by Cenomanian to Santonian finely laminated black shales, rich in organic matter of marine origin, which accumulated on a thermally subsiding ramp. Early Campanian hiatuses are thought to be the result of final disjunction of Demerara Rise (South America) from Africa and the onset of deep water communication between the two Atlantic basins (south and central). The overlying Uppermost Cretaceous–Oligocene chalk includes rich and diversified calcareous plankton assemblages, as well as two radiolarian-rich intervals (Late Campanian and Middle Eocene). A complex erosional surface developed during the Late Oligocene–Early Miocene. Sedimentation was impeded since then on the intermediate and deep sites of Demerara Rise, possibly due to the action of deep submarine currents. *To cite this article: T. Danelian et al., C. R. Geoscience 337 (2005).*

Keywords:	Atlantique tropical Demerara Crétacé Tertiaire Tropical Atlantic Demerara Cretaceous Tertiary Black shales
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