Black shale deposition on the northwest African Shelf during the Cenomanian/Turonian oceanic anoxic event: Climate coupling and global organic carbon burial
Identifieur interne : 000782 ( Main/Exploration ); précédent : 000781; suivant : 000783Black shale deposition on the northwest African Shelf during the Cenomanian/Turonian oceanic anoxic event: Climate coupling and global organic carbon burial
Auteurs : Sadat Kolonic [Allemagne, Pays-Bas] ; Thomas Wagner [Allemagne] ; Astrid Forster [Pays-Bas] ; Jaap S. Sinninghe Damsté [Pays-Bas] ; Ben Walsworth-Bell [Italie] ; Elisabetta Erba [Italie] ; Steven Turgeon [Allemagne, États-Unis] ; Hans-Jürgen Brumsack [Allemagne] ; El Hassane Chellai [Maroc] ; Harilaos Tsikos [Royaume-Uni] ; Wolfgang Kuhnt [Allemagne] ; Marcel M. M. Kuypers [Allemagne]Source :
- Paleoceanography [ 0883-8305 ] ; 2005-03.
Abstract
High‐resolution geochemical records from a depth transect through the Cenomanian/Turonian (C/T) Tarfaya Basin (northwest African Shelf) reveal high‐amplitude fluctuations in accumulation rates of organic carbon (OC), redox‐sensitive and sulphide‐forming trace metals, and biomarkers indicative of photic zone euxinia. These fluctuations are in general coeval and thus imply a strong relationship of OC burial and water column redox conditions. The pacing and regularity of the records and the absence of a prominent continental signature suggest a dynamic depositional setting linked to orbital and higher‐frequency forcing. Determining the dominant frequency depends on the definition of the most pronounced oceanic anoxic event (OAE2) and its duration. We propose that eccentricity is the main forcing factor at Tarfaya and controlled fluctuations in wind‐driven upwelling of nutrient‐rich, oxygen‐depleted intermediate waters from the adjacent Atlantic and the periodic development of photic zone and bottom water euxinia on the mid‐Cretaceous northwest African shelf. Accumulation records clearly identify the basin center as the primary site of sediment deposition with highest temporal variability and an up to six‐fold increase in OC burial from ∼2 g/m2 · yr prior to the OAE2 to ∼12 g/m2 · yr during the OAE2. Photic zone and bottom water euxinia alternated with periods of greater oxygenation of the water column in response to climate forcing. Mass balance calculations imply that ∼2% of the overall global excess OC burial associated with the OAE2 was deposited in the Tarfaya Basin, an area that represented only ∼0.05% of the total global C/T ocean floor. In fact, the lateral extent of similar black shales along the African continental margin indicates that this part of the ocean contributed significantly to the global increase in organic carbon burial during the OAE2.
Url:
DOI: 10.1029/2003PA000950
Affiliations:
- Allemagne, Italie, Maroc, Pays-Bas, Royaume-Uni, États-Unis
- Angleterre, Brême (Land), Lombardie, Marrakech-Tensift-Al Haouz, Oxfordshire, Schleswig-Holstein, Tennessee, Utrecht (province)
- Brême, Kiel, Marrakech, Milan, Oxford, Utrecht
- Université d'Oxford
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M." last="Kuypers">Marcel M. M. Kuypers</name><affiliation wicri:level="3"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Bremen</wicri:regionArea><placeName><region type="land" nuts="3">Brême (Land)</region><settlement type="city">Brême</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Paleoceanography</title><title level="j" type="abbrev">Paleoceanography</title><idno type="ISSN">0883-8305</idno><idno type="eISSN">1944-9186</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2005-03">2005-03</date><biblScope unit="volume">20</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint><idno type="ISSN">0883-8305</idno></series><idno type="istex">282B6CCF6FAF3CFC8CA9898C66C83F53E3B1A6B2</idno><idno type="DOI">10.1029/2003PA000950</idno><idno type="ArticleID">2003PA000950</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0883-8305</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">High‐resolution geochemical records from a depth transect through the Cenomanian/Turonian (C/T) Tarfaya Basin (northwest African Shelf) reveal high‐amplitude fluctuations in accumulation rates of organic carbon (OC), redox‐sensitive and sulphide‐forming trace metals, and biomarkers indicative of photic zone euxinia. These fluctuations are in general coeval and thus imply a strong relationship of OC burial and water column redox conditions. The pacing and regularity of the records and the absence of a prominent continental signature suggest a dynamic depositional setting linked to orbital and higher‐frequency forcing. Determining the dominant frequency depends on the definition of the most pronounced oceanic anoxic event (OAE2) and its duration. We propose that eccentricity is the main forcing factor at Tarfaya and controlled fluctuations in wind‐driven upwelling of nutrient‐rich, oxygen‐depleted intermediate waters from the adjacent Atlantic and the periodic development of photic zone and bottom water euxinia on the mid‐Cretaceous northwest African shelf. Accumulation records clearly identify the basin center as the primary site of sediment deposition with highest temporal variability and an up to six‐fold increase in OC burial from ∼2 g/m2 · yr prior to the OAE2 to ∼12 g/m2 · yr during the OAE2. Photic zone and bottom water euxinia alternated with periods of greater oxygenation of the water column in response to climate forcing. Mass balance calculations imply that ∼2% of the overall global excess OC burial associated with the OAE2 was deposited in the Tarfaya Basin, an area that represented only ∼0.05% of the total global C/T ocean floor. In fact, the lateral extent of similar black shales along the African continental margin indicates that this part of the ocean contributed significantly to the global increase in organic carbon burial during the OAE2.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>Italie</li><li>Maroc</li><li>Pays-Bas</li><li>Royaume-Uni</li><li>États-Unis</li></country><region><li>Angleterre</li><li>Brême (Land)</li><li>Lombardie</li><li>Marrakech-Tensift-Al Haouz</li><li>Oxfordshire</li><li>Schleswig-Holstein</li><li>Tennessee</li><li>Utrecht (province)</li></region><settlement><li>Brême</li><li>Kiel</li><li>Marrakech</li><li>Milan</li><li>Oxford</li><li>Utrecht</li></settlement><orgName><li>Université d'Oxford</li></orgName></list><tree><country name="Allemagne"><region name="Brême (Land)"><name sortKey="Kolonic, Sadat" sort="Kolonic, Sadat" uniqKey="Kolonic S" first="Sadat" last="Kolonic">Sadat Kolonic</name></region><name sortKey="Brumsack, Hans Rgen" sort="Brumsack, Hans Rgen" uniqKey="Brumsack H" first="Hans-Jürgen" last="Brumsack">Hans-Jürgen Brumsack</name><name sortKey="Kolonic, Sadat" sort="Kolonic, Sadat" uniqKey="Kolonic S" first="Sadat" last="Kolonic">Sadat Kolonic</name><name sortKey="Kuhnt, Wolfgang" sort="Kuhnt, Wolfgang" uniqKey="Kuhnt W" first="Wolfgang" last="Kuhnt">Wolfgang Kuhnt</name><name sortKey="Kuypers, Marcel M M" sort="Kuypers, Marcel M M" uniqKey="Kuypers M" first="Marcel M. M." last="Kuypers">Marcel M. M. Kuypers</name><name sortKey="Turgeon, Steven" sort="Turgeon, Steven" uniqKey="Turgeon S" first="Steven" last="Turgeon">Steven Turgeon</name><name sortKey="Wagner, Thomas" sort="Wagner, Thomas" uniqKey="Wagner T" first="Thomas" last="Wagner">Thomas Wagner</name></country><country name="Pays-Bas"><noRegion><name sortKey="Kolonic, Sadat" sort="Kolonic, Sadat" uniqKey="Kolonic S" first="Sadat" last="Kolonic">Sadat Kolonic</name></noRegion><name sortKey="Forster, Astrid" sort="Forster, Astrid" uniqKey="Forster A" first="Astrid" last="Forster">Astrid Forster</name><name sortKey="Sinninghe Damste, Jaap S" sort="Sinninghe Damste, Jaap S" uniqKey="Sinninghe Damste J" first="Jaap S." last="Sinninghe Damsté">Jaap S. Sinninghe Damsté</name><name sortKey="Sinninghe Damste, Jaap S" sort="Sinninghe Damste, Jaap S" uniqKey="Sinninghe Damste J" first="Jaap S." last="Sinninghe Damsté">Jaap S. Sinninghe Damsté</name></country><country name="Italie"><region name="Lombardie"><name sortKey="Walsworth Ell, Ben" sort="Walsworth Ell, Ben" uniqKey="Walsworth Ell B" first="Ben" last="Walsworth-Bell">Ben Walsworth-Bell</name></region><name sortKey="Erba, Elisabetta" sort="Erba, Elisabetta" uniqKey="Erba E" first="Elisabetta" last="Erba">Elisabetta Erba</name></country><country name="États-Unis"><region name="Tennessee"><name sortKey="Turgeon, Steven" sort="Turgeon, Steven" uniqKey="Turgeon S" first="Steven" last="Turgeon">Steven Turgeon</name></region></country><country name="Maroc"><region name="Marrakech-Tensift-Al Haouz"><name sortKey="Chellai, El Hassane" sort="Chellai, El Hassane" uniqKey="Chellai E" first="El Hassane" last="Chellai">El Hassane Chellai</name></region></country><country name="Royaume-Uni"><region name="Angleterre"><name sortKey="Tsikos, Harilaos" sort="Tsikos, Harilaos" uniqKey="Tsikos H" first="Harilaos" last="Tsikos">Harilaos Tsikos</name></region><name sortKey="Tsikos, Harilaos" sort="Tsikos, Harilaos" uniqKey="Tsikos H" first="Harilaos" last="Tsikos">Harilaos Tsikos</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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