georefid:2013-034374SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1029/2010PA0019252010-01-01publicationgeorefid:2013-034374doi:10.1029/2010PA001925Trabucho Alexandre, JoaoUtrecht University, Department of Earth Sciences, Utrecht, NetherlandsauthorTuenter, ErikShell Technology India Private, IndiaauthorHenstra, Gijs A.authorvan der Zwan, Kees J.authorvan de Wal, Roderik S. W.authorDijkstra, Henk A.authorde Boer, Poppe L.authorAmerican Geophysical Union, Washington, DC, United StatespublisherdocumentHardcopyPaleoceanography25 (4)Organic-rich sediments are the salient marine sedimentation product in the mid-Cretaceous of the ocean basins formed in the Mesozoic. Oceanic anoxic events (OAEs) are discrete and particularly organic-rich intervals within these mid-Cretaceous organic-rich sequences and are defined by pronounced carbon isotope excursions. Marine productivity during OAEs appears to have been enhanced by the increased availability of biolimiting nutrients in seawater due to hydrothermal alteration of submarine basalts in the Pacific and proto-Indian oceans. The exact mechanisms behind the deposition of organic-rich sediments in the mid-Cretaceous are still a matter of discussion, but a hypothesis which is often put forward is that their deposition was a consequence of the coupling of a particular paleogeography with changes in ocean circulation and nutrient supply. In this study, we used a global coupled climate model to investigate oceanic processes that affect the interbasinal exchange of nutrients as well as their spatial distribution and bioavailability. We conclude that the mid-Cretaceous North Atlantic was a nutrient trap as a consequence of an estuarine circulation with respect to the Pacific. Organic-rich sediments in the North Atlantic were deposited below regions of intense upwelling. We suggest that enhanced productivity during OAEs was a consequence of upwelling of Pacific-derived nutrient-rich seawater associated with submarine igneous events.completedStratigraphyAtlantic Oceanblack shaleCape Verde Basinclastic rocksCommunity Climate System ModelCretaceousdata processingDeep Sea Drilling Projectdigital simulationDSDP Site 367general circulation modelsgloballarge igneous provincesLeg 210Leg 41MesozoicMiddle CretaceousNewfoundland BasinNorth AtlanticNorthwest Atlanticnumerical modelsocean circulationOcean Drilling Programoceanic anoxic eventsODP Site 1276paleo-oceanographypaleogeographysedimentary rocksthree-dimensional modelsupwellingvelocityurn:org.iodp:exp:210urnlargerWorkCitationcampaignurn:org.iodp:exp:41urnlargerWorkCitationcampaignurn:org.iodp:exp:41:site:367urnlargerWorkCitationstudyurn:org.iodp:exp:41urnlargerWorkCitationcampaignurn:org.iodp:exp:210:site:1276urnlargerWorkCitationstudyurn:org.iodp:exp:210urnlargerWorkCitationcampaignEnglishgeoscientificInformation-44.4700-20.025012.291345.2400