Mesozoic biostratigraphic, paleoenvironmental, and paleobiogeographic synthesis, equatorial Atlantic : Côte d'Ivoire-Ghana transform margin Eastern Equatorial Atlantic
Identifieur interne : 00CB58 ( Main/Exploration ); précédent : 00CB57; suivant : 00CB59Mesozoic biostratigraphic, paleoenvironmental, and paleobiogeographic synthesis, equatorial Atlantic : Côte d'Ivoire-Ghana transform margin Eastern Equatorial Atlantic
Auteurs : M. Moullade [France] ; D. K. Watkins [États-Unis] ; F. E. Oboh-Ikuenobe [États-Unis] ; J.-P. Bellier [France] ; E. Masure [France] ; A. E. L. Holbourn [Allemagne] ; J. Erbacher [Allemagne] ; W. Kuhnt [Allemagne] ; T. Pletsch [Allemagne] ; M. A. Kaminski [Royaume-Uni] ; R. Rauscher [France] ; S. Shafik [Australie] ; O. Yepes [États-Unis] ; J. Dejax [France] ; J. M. Gregg [États-Unis] ; I. C. Shin [Corée du Sud] ; M. Schuler [France]Source :
- Proceedings of the Ocean Drilling Program. Scientific results [ 0884-5891 ] ; 1998.
Descripteurs français
- Pascal (Inist)
- Ghana, Océan Atlantique Equatorial, Océan Atlantique Est, Côte d'Ivoire, Marge continentale active, Mésozoïque, Crétacé, Forage, ODP, Biostratigraphie, Milieu sédimentation, Aptien, Milieu marin, Sédimentation marine, Albien, Cénomanien, Coniacien, Paléobiogéographie, Chronostratigraphie, Paléoenvironnement, Faune invertébré, ODP Leg 159.
- Wicri :
- geographic : Ghana, Côte d'Ivoire.
- topic : Forage, Milieu marin.
English descriptors
- KwdEn :
- Albian, Aptian, Cenomanian, Coniacian, Cretaceous, East Atlantic, Equatorial Atlantic, Ghana, Ivory Coast, Mesozoic, Ocean Drilling Program, active continental margins, biostratigraphy, chronostratigraphy, depositional environment, drilling, invertebrates, marine environment, marine sedimentation, paleobiogeography, paleoenvironment.
Abstract
Cretaceous sediments from Ocean Drilling Program Leg 159 on the Cute d'Ivoire-Ghana Marginal Ridge (CIGMR), eastern equatorial Atlantic, are characterized by distinct stratigraphic changes in sedimentary facies associated with changes in the composition of the clayey and organic fractions, as well as of the calcareous nannofossil, radiolarian, foraminiferal, and palynomorph assemblages. In the absence of reliable magnetostratigraphic information, an integrated biostratigraphy provides the only means used to calibrate the geologic history of the Leg 159 area. The existence of marine depositional environments as early as the late Aptian to early Albian close to the Leg 159 drill sites puts constraints on the timing of the opening of the equatorial Atlantic gateway. Marine sedimentation on the ridge suggests that the West African and South American cratons were largely detached at this segment of the margin by the middle to late Albian During the Cenomanian to Coniacian the ridge appears to have remained in an elevated position with concurrent low deposition or condensation (Site 959), high carbonate debris accumulation (Site 960), and even erosion (Site 962). Total organic Carbon measurements and microfaunal data lead us to suggest that, following the early opening of the seaway during the Albian, circulation remained restricted in the fragmented sub-basins of the CIGMR. It probably was not until the Santonian that a deep-water connection and circulation system became established between the Central and the South Atlantic. The sedimentary and faunal record at Site 959 show that a rapid subsidence occurred during the Santonian, with sub-calcite compensation depth conditions maintained until and beyond the Cretaceous/Tertiary boundary.
Affiliations:
- Allemagne, Australie, Corée du Sud, France, Royaume-Uni, États-Unis
- Alsace (région administrative), Angleterre, Bade-Wurtemberg, District de Tübingen, Grand Est, Grand Londres, Provence-Alpes-Côte d'Azur, Région capitale de Séoul, Schleswig-Holstein, Île-de-France
- Kiel, Londres, Nice, Paris, Strasbourg, Séoul, Tübingen
- University College de Londres, Université Pierre-et-Marie-Curie
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Le document en format XML
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Museum für Geologie/Paläontologie der Universität Tübingen, Sigwartstrasse 10</s1><s2>72076, Tübingen</s2><s3>DEU</s3><sZ>7 aut.</sZ></inist:fA14><country>Allemagne</country><placeName><region type="land" nuts="1">Bade-Wurtemberg</region><region type="district" nuts="2">District de Tübingen</region><settlement type="city">Tübingen</settlement></placeName></affiliation></author><author><name sortKey="Kuhnt, W" sort="Kuhnt, W" uniqKey="Kuhnt W" first="W." last="Kuhnt">W. Kuhnt</name><affiliation wicri:level="3"><inist:fA14 i1="05"><s1>Geologisch-Paläontologisches Institut der Christian-Albrechts-Universität zu Kiel, Olshausenstrasse 40</s1><s2>24118 Kiel</s2><s3>DEU</s3><sZ>6 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Allemagne</country><placeName><region type="land" nuts="2">Schleswig-Holstein</region><settlement type="city">Kiel</settlement></placeName></affiliation></author><author><name sortKey="Pletsch, T" sort="Pletsch, T" uniqKey="Pletsch T" first="T." last="Pletsch">T. Pletsch</name><affiliation wicri:level="3"><inist:fA14 i1="05"><s1>Geologisch-Paläontologisches Institut der Christian-Albrechts-Universität zu Kiel, Olshausenstrasse 40</s1><s2>24118 Kiel</s2><s3>DEU</s3><sZ>6 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Allemagne</country><placeName><region type="land" nuts="2">Schleswig-Holstein</region><settlement type="city">Kiel</settlement></placeName></affiliation></author><author><name sortKey="Kaminski, M A" sort="Kaminski, M A" uniqKey="Kaminski M" first="M. A." last="Kaminski">M. A. Kaminski</name><affiliation wicri:level="4"><inist:fA14 i1="07"><s1>Research School of Geological and Geophysical Sciences, Birkbeck College and University College London, Gower Street</s1><s2>London WC1E 6BT</s2><s3>GBR</s3><sZ>10 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>London WC1E 6BT</wicri:noRegion><orgName type="university">University College de Londres</orgName><placeName><settlement type="city">Londres</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Grand Londres</region></placeName></affiliation></author><author><name sortKey="Rauscher, R" sort="Rauscher, R" uniqKey="Rauscher R" first="R." last="Rauscher">R. Rauscher</name><affiliation wicri:level="3"><inist:fA14 i1="08"><s1>Centre de Géochimie de la Surface (CNRS), 1 rue Blessig</s1><s2>67084 Strasbourg</s2><s3>FRA</s3><sZ>11 aut.</sZ><sZ>17 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Alsace (région administrative)</region><settlement type="city">Strasbourg</settlement></placeName></affiliation></author><author><name sortKey="Shafik, S" sort="Shafik, S" uniqKey="Shafik S" first="S." last="Shafik">S. Shafik</name><affiliation wicri:level="1"><inist:fA14 i1="09"><s1>Marine Science and Petroleum Geology Program, Australian Geological Survey Organization, GPO Box 378</s1><s2>Canberra, ACT 2601</s2><s3>AUS</s3><sZ>12 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Canberra, ACT 2601</wicri:noRegion></affiliation></author><author><name sortKey="Yepes, O" sort="Yepes, O" uniqKey="Yepes O" first="O." last="Yepes">O. Yepes</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Department of Geology and Geophysics, University of Missouri-Rolla</s1><s2>Rolla, MO 65409-0410</s2><s3>USA</s3><sZ>3 aut.</sZ><sZ>13 aut.</sZ><sZ>15 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Rolla, MO 65409-0410</wicri:noRegion></affiliation></author><author><name sortKey="Dejax, J" sort="Dejax, J" uniqKey="Dejax J" first="J." last="Dejax">J. Dejax</name><affiliation wicri:level="3"><inist:fA14 i1="10"><s1>Laboratoire de Paléontologie, Museum National d'Histoire Naturelle, 8 rue Buffon</s1><s2>75005 Paris</s2><s3>FRA</s3><sZ>14 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Paris</settlement></placeName></affiliation></author><author><name sortKey="Gregg, J M" sort="Gregg, J M" uniqKey="Gregg J" first="J. M." last="Gregg">J. M. Gregg</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Department of Geology and Geophysics, University of Missouri-Rolla</s1><s2>Rolla, MO 65409-0410</s2><s3>USA</s3><sZ>3 aut.</sZ><sZ>13 aut.</sZ><sZ>15 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Rolla, MO 65409-0410</wicri:noRegion></affiliation></author><author><name sortKey="Shin, I C" sort="Shin, I C" uniqKey="Shin I" first="I. C." last="Shin">I. C. Shin</name><affiliation wicri:level="1"><inist:fA14 i1="11"><s1>Korea Ocean Research and Development Institute, Ansan, P.O. Box 29</s1><s2>Seoul 425-600</s2><s3>KOR</s3><sZ>16 aut.</sZ></inist:fA14><country>Corée du Sud</country><placeName><settlement type="city">Séoul</settlement><region type="capital">Région capitale de Séoul</region></placeName></affiliation></author><author><name sortKey="Schuler, M" sort="Schuler, M" uniqKey="Schuler M" first="M." last="Schuler">M. Schuler</name><affiliation wicri:level="3"><inist:fA14 i1="08"><s1>Centre de Géochimie de la Surface (CNRS), 1 rue Blessig</s1><s2>67084 Strasbourg</s2><s3>FRA</s3><sZ>11 aut.</sZ><sZ>17 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Alsace (région administrative)</region><settlement type="city">Strasbourg</settlement></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">00-0307082</idno><date when="1998">1998</date><idno type="stanalyst">PASCAL 00-0307082 INIST</idno><idno type="RBID">Pascal:00-0307082</idno><idno type="wicri:Area/PascalFrancis/Corpus">005F11</idno><idno type="wicri:Area/PascalFrancis/Curation">000259</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">006344</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">006344</idno><idno type="wicri:doubleKey">0884-5891:1998:Moullade M:mesozoic:biostratigraphic:paleoenvironmental</idno><idno type="wicri:Area/Main/Merge">00DC31</idno><idno type="wicri:Area/Main/Curation">00CB58</idno><idno type="wicri:Area/Main/Exploration">00CB58</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Mesozoic biostratigraphic, paleoenvironmental, and paleobiogeographic synthesis, equatorial Atlantic : Côte d'Ivoire-Ghana transform margin Eastern Equatorial Atlantic</title><author><name sortKey="Moullade, M" sort="Moullade, M" uniqKey="Moullade M" first="M." last="Moullade">M. Moullade</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Laboratoire de Micropaléontologie et de Géologie Marines, CNRS UMR 6526 et GDR 88, Université de Nice-Sophia Antipolis, Parc Valrose</s1><s2>06108 Nice</s2><s3>FRA</s3><sZ>1 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Provence-Alpes-Côte d'Azur</region><settlement type="city">Nice</settlement></placeName></affiliation></author><author><name sortKey="Watkins, D K" sort="Watkins, D K" uniqKey="Watkins D" first="D. K." last="Watkins">D. K. Watkins</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Geology, University of Nebraska</s1><s2>Lincoln, NE 68588-0340</s2><s3>USA</s3><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Lincoln, NE 68588-0340</wicri:noRegion></affiliation></author><author><name sortKey="Oboh Ikuenobe, F E" sort="Oboh Ikuenobe, F E" uniqKey="Oboh Ikuenobe F" first="F. E." last="Oboh-Ikuenobe">F. E. Oboh-Ikuenobe</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Department of Geology and Geophysics, University of Missouri-Rolla</s1><s2>Rolla, MO 65409-0410</s2><s3>USA</s3><sZ>3 aut.</sZ><sZ>13 aut.</sZ><sZ>15 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Rolla, MO 65409-0410</wicri:noRegion></affiliation></author><author><name sortKey="Bellier, J P" sort="Bellier, J P" uniqKey="Bellier J" first="J.-P." last="Bellier">J.-P. Bellier</name><affiliation wicri:level="4"><inist:fA14 i1="04"><s1>Laboratoire de Micropaléontologie, URA CNRS 1761, Université Pierre et Marie Curie, 4 place Jussieu</s1><s2>75252 Paris</s2><s3>FRA</s3><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>75252 Paris</wicri:noRegion><placeName><settlement type="city">Paris</settlement><region type="région" nuts="2">Île-de-France</region><settlement type="city">Paris</settlement></placeName><orgName type="university">Université Pierre-et-Marie-Curie</orgName></affiliation></author><author><name sortKey="Masure, E" sort="Masure, E" uniqKey="Masure E" first="E." last="Masure">E. Masure</name><affiliation wicri:level="4"><inist:fA14 i1="04"><s1>Laboratoire de Micropaléontologie, URA CNRS 1761, Université Pierre et Marie Curie, 4 place Jussieu</s1><s2>75252 Paris</s2><s3>FRA</s3><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>75252 Paris</wicri:noRegion><placeName><settlement type="city">Paris</settlement><region type="région" nuts="2">Île-de-France</region><settlement type="city">Paris</settlement></placeName><orgName type="university">Université Pierre-et-Marie-Curie</orgName></affiliation></author><author><name sortKey="Holbourn, A E L" sort="Holbourn, A E L" uniqKey="Holbourn A" first="A. E. L." last="Holbourn">A. E. L. Holbourn</name><affiliation wicri:level="3"><inist:fA14 i1="05"><s1>Geologisch-Paläontologisches Institut der Christian-Albrechts-Universität zu Kiel, Olshausenstrasse 40</s1><s2>24118 Kiel</s2><s3>DEU</s3><sZ>6 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Allemagne</country><placeName><region type="land" nuts="2">Schleswig-Holstein</region><settlement type="city">Kiel</settlement></placeName></affiliation></author><author><name sortKey="Erbacher, J" sort="Erbacher, J" uniqKey="Erbacher J" first="J." last="Erbacher">J. Erbacher</name><affiliation wicri:level="3"><inist:fA14 i1="06"><s1>Institut u. Museum für Geologie/Paläontologie der Universität Tübingen, Sigwartstrasse 10</s1><s2>72076, Tübingen</s2><s3>DEU</s3><sZ>7 aut.</sZ></inist:fA14><country>Allemagne</country><placeName><region type="land" nuts="1">Bade-Wurtemberg</region><region type="district" nuts="2">District de Tübingen</region><settlement type="city">Tübingen</settlement></placeName></affiliation></author><author><name sortKey="Kuhnt, W" sort="Kuhnt, W" uniqKey="Kuhnt W" first="W." last="Kuhnt">W. Kuhnt</name><affiliation wicri:level="3"><inist:fA14 i1="05"><s1>Geologisch-Paläontologisches Institut der Christian-Albrechts-Universität zu Kiel, Olshausenstrasse 40</s1><s2>24118 Kiel</s2><s3>DEU</s3><sZ>6 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Allemagne</country><placeName><region type="land" nuts="2">Schleswig-Holstein</region><settlement type="city">Kiel</settlement></placeName></affiliation></author><author><name sortKey="Pletsch, T" sort="Pletsch, T" uniqKey="Pletsch T" first="T." last="Pletsch">T. Pletsch</name><affiliation wicri:level="3"><inist:fA14 i1="05"><s1>Geologisch-Paläontologisches Institut der Christian-Albrechts-Universität zu Kiel, Olshausenstrasse 40</s1><s2>24118 Kiel</s2><s3>DEU</s3><sZ>6 aut.</sZ><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Allemagne</country><placeName><region type="land" nuts="2">Schleswig-Holstein</region><settlement type="city">Kiel</settlement></placeName></affiliation></author><author><name sortKey="Kaminski, M A" sort="Kaminski, M A" uniqKey="Kaminski M" first="M. A." last="Kaminski">M. A. Kaminski</name><affiliation wicri:level="4"><inist:fA14 i1="07"><s1>Research School of Geological and Geophysical Sciences, Birkbeck College and University College London, Gower Street</s1><s2>London WC1E 6BT</s2><s3>GBR</s3><sZ>10 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>London WC1E 6BT</wicri:noRegion><orgName type="university">University College de Londres</orgName><placeName><settlement type="city">Londres</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Grand Londres</region></placeName></affiliation></author><author><name sortKey="Rauscher, R" sort="Rauscher, R" uniqKey="Rauscher R" first="R." last="Rauscher">R. Rauscher</name><affiliation wicri:level="3"><inist:fA14 i1="08"><s1>Centre de Géochimie de la Surface (CNRS), 1 rue Blessig</s1><s2>67084 Strasbourg</s2><s3>FRA</s3><sZ>11 aut.</sZ><sZ>17 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Alsace (région administrative)</region><settlement type="city">Strasbourg</settlement></placeName></affiliation></author><author><name sortKey="Shafik, S" sort="Shafik, S" uniqKey="Shafik S" first="S." last="Shafik">S. Shafik</name><affiliation wicri:level="1"><inist:fA14 i1="09"><s1>Marine Science and Petroleum Geology Program, Australian Geological Survey Organization, GPO Box 378</s1><s2>Canberra, ACT 2601</s2><s3>AUS</s3><sZ>12 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Canberra, ACT 2601</wicri:noRegion></affiliation></author><author><name sortKey="Yepes, O" sort="Yepes, O" uniqKey="Yepes O" first="O." last="Yepes">O. Yepes</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Department of Geology and Geophysics, University of Missouri-Rolla</s1><s2>Rolla, MO 65409-0410</s2><s3>USA</s3><sZ>3 aut.</sZ><sZ>13 aut.</sZ><sZ>15 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Rolla, MO 65409-0410</wicri:noRegion></affiliation></author><author><name sortKey="Dejax, J" sort="Dejax, J" uniqKey="Dejax J" first="J." last="Dejax">J. Dejax</name><affiliation wicri:level="3"><inist:fA14 i1="10"><s1>Laboratoire de Paléontologie, Museum National d'Histoire Naturelle, 8 rue Buffon</s1><s2>75005 Paris</s2><s3>FRA</s3><sZ>14 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Paris</settlement></placeName></affiliation></author><author><name sortKey="Gregg, J M" sort="Gregg, J M" uniqKey="Gregg J" first="J. M." last="Gregg">J. M. Gregg</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Department of Geology and Geophysics, University of Missouri-Rolla</s1><s2>Rolla, MO 65409-0410</s2><s3>USA</s3><sZ>3 aut.</sZ><sZ>13 aut.</sZ><sZ>15 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Rolla, MO 65409-0410</wicri:noRegion></affiliation></author><author><name sortKey="Shin, I C" sort="Shin, I C" uniqKey="Shin I" first="I. C." last="Shin">I. C. Shin</name><affiliation wicri:level="1"><inist:fA14 i1="11"><s1>Korea Ocean Research and Development Institute, Ansan, P.O. Box 29</s1><s2>Seoul 425-600</s2><s3>KOR</s3><sZ>16 aut.</sZ></inist:fA14><country>Corée du Sud</country><placeName><settlement type="city">Séoul</settlement><region type="capital">Région capitale de Séoul</region></placeName></affiliation></author><author><name sortKey="Schuler, M" sort="Schuler, M" uniqKey="Schuler M" first="M." last="Schuler">M. Schuler</name><affiliation wicri:level="3"><inist:fA14 i1="08"><s1>Centre de Géochimie de la Surface (CNRS), 1 rue Blessig</s1><s2>67084 Strasbourg</s2><s3>FRA</s3><sZ>11 aut.</sZ><sZ>17 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Alsace (région administrative)</region><settlement type="city">Strasbourg</settlement></placeName></affiliation></author></analytic><series><title level="j" type="main">Proceedings of the Ocean Drilling Program. Scientific results</title><title level="j" type="abbreviated">Proc. Ocean Drill. Program Sci. results</title><idno type="ISSN">0884-5891</idno><imprint><date when="1998">1998</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Proceedings of the Ocean Drilling Program. Scientific results</title><title level="j" type="abbreviated">Proc. Ocean Drill. Program Sci. results</title><idno type="ISSN">0884-5891</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Albian</term><term>Aptian</term><term>Cenomanian</term><term>Coniacian</term><term>Cretaceous</term><term>East Atlantic</term><term>Equatorial Atlantic</term><term>Ghana</term><term>Ivory Coast</term><term>Mesozoic</term><term>Ocean Drilling Program</term><term>active continental margins</term><term>biostratigraphy</term><term>chronostratigraphy</term><term>depositional environment</term><term>drilling</term><term>invertebrates</term><term>marine environment</term><term>marine sedimentation</term><term>paleobiogeography</term><term>paleoenvironment</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Ghana</term><term>Océan Atlantique Equatorial</term><term>Océan Atlantique Est</term><term>Côte d'Ivoire</term><term>Marge continentale active</term><term>Mésozoïque</term><term>Crétacé</term><term>Forage</term><term>ODP</term><term>Biostratigraphie</term><term>Milieu sédimentation</term><term>Aptien</term><term>Milieu marin</term><term>Sédimentation marine</term><term>Albien</term><term>Cénomanien</term><term>Coniacien</term><term>Paléobiogéographie</term><term>Chronostratigraphie</term><term>Paléoenvironnement</term><term>Faune invertébré</term><term>ODP Leg 159</term></keywords><keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Ghana</term><term>Côte d'Ivoire</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Forage</term><term>Milieu marin</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Cretaceous sediments from Ocean Drilling Program Leg 159 on the Cute d'Ivoire-Ghana Marginal Ridge (CIGMR), eastern equatorial Atlantic, are characterized by distinct stratigraphic changes in sedimentary facies associated with changes in the composition of the clayey and organic fractions, as well as of the calcareous nannofossil, radiolarian, foraminiferal, and palynomorph assemblages. In the absence of reliable magnetostratigraphic information, an integrated biostratigraphy provides the only means used to calibrate the geologic history of the Leg 159 area. The existence of marine depositional environments as early as the late Aptian to early Albian close to the Leg 159 drill sites puts constraints on the timing of the opening of the equatorial Atlantic gateway. Marine sedimentation on the ridge suggests that the West African and South American cratons were largely detached at this segment of the margin by the middle to late Albian During the Cenomanian to Coniacian the ridge appears to have remained in an elevated position with concurrent low deposition or condensation (Site 959), high carbonate debris accumulation (Site 960), and even erosion (Site 962). Total organic Carbon measurements and microfaunal data lead us to suggest that, following the early opening of the seaway during the Albian, circulation remained restricted in the fragmented sub-basins of the CIGMR. It probably was not until the Santonian that a deep-water connection and circulation system became established between the Central and the South Atlantic. The sedimentary and faunal record at Site 959 show that a rapid subsidence occurred during the Santonian, with sub-calcite compensation depth conditions maintained until and beyond the Cretaceous/Tertiary boundary.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>Australie</li><li>Corée du Sud</li><li>France</li><li>Royaume-Uni</li><li>États-Unis</li></country><region><li>Alsace (région administrative)</li><li>Angleterre</li><li>Bade-Wurtemberg</li><li>District de Tübingen</li><li>Grand Est</li><li>Grand Londres</li><li>Provence-Alpes-Côte d'Azur</li><li>Région capitale de Séoul</li><li>Schleswig-Holstein</li><li>Île-de-France</li></region><settlement><li>Kiel</li><li>Londres</li><li>Nice</li><li>Paris</li><li>Strasbourg</li><li>Séoul</li><li>Tübingen</li></settlement><orgName><li>University College de Londres</li><li>Université Pierre-et-Marie-Curie</li></orgName></list><tree><country name="France"><region name="Provence-Alpes-Côte d'Azur"><name sortKey="Moullade, M" sort="Moullade, M" uniqKey="Moullade M" first="M." last="Moullade">M. Moullade</name></region><name sortKey="Bellier, J P" sort="Bellier, J P" uniqKey="Bellier J" first="J.-P." last="Bellier">J.-P. Bellier</name><name sortKey="Dejax, J" sort="Dejax, J" uniqKey="Dejax J" first="J." last="Dejax">J. Dejax</name><name sortKey="Masure, E" sort="Masure, E" uniqKey="Masure E" first="E." last="Masure">E. Masure</name><name sortKey="Rauscher, R" sort="Rauscher, R" uniqKey="Rauscher R" first="R." last="Rauscher">R. Rauscher</name><name sortKey="Schuler, M" sort="Schuler, M" uniqKey="Schuler M" first="M." last="Schuler">M. Schuler</name></country><country name="États-Unis"><noRegion><name sortKey="Watkins, D K" sort="Watkins, D K" uniqKey="Watkins D" first="D. K." last="Watkins">D. K. Watkins</name></noRegion><name sortKey="Gregg, J M" sort="Gregg, J M" uniqKey="Gregg J" first="J. M." last="Gregg">J. M. Gregg</name><name sortKey="Oboh Ikuenobe, F E" sort="Oboh Ikuenobe, F E" uniqKey="Oboh Ikuenobe F" first="F. E." last="Oboh-Ikuenobe">F. E. Oboh-Ikuenobe</name><name sortKey="Yepes, O" sort="Yepes, O" uniqKey="Yepes O" first="O." last="Yepes">O. Yepes</name></country><country name="Allemagne"><region name="Schleswig-Holstein"><name sortKey="Holbourn, A E L" sort="Holbourn, A E L" uniqKey="Holbourn A" first="A. E. L." last="Holbourn">A. E. L. Holbourn</name></region><name sortKey="Erbacher, J" sort="Erbacher, J" uniqKey="Erbacher J" first="J." last="Erbacher">J. Erbacher</name><name sortKey="Kuhnt, W" sort="Kuhnt, W" uniqKey="Kuhnt W" first="W." last="Kuhnt">W. Kuhnt</name><name sortKey="Pletsch, T" sort="Pletsch, T" uniqKey="Pletsch T" first="T." last="Pletsch">T. Pletsch</name></country><country name="Royaume-Uni"><region name="Angleterre"><name sortKey="Kaminski, M A" sort="Kaminski, M A" uniqKey="Kaminski M" first="M. A." last="Kaminski">M. A. Kaminski</name></region></country><country name="Australie"><noRegion><name sortKey="Shafik, S" sort="Shafik, S" uniqKey="Shafik S" first="S." last="Shafik">S. Shafik</name></noRegion></country><country name="Corée du Sud"><region name="Région capitale de Séoul"><name sortKey="Shin, I C" sort="Shin, I C" uniqKey="Shin I" first="I. C." last="Shin">I. C. Shin</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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