georefid:2009-055552SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2009-0555522005-01-01publicationgeorefid:2009-055552Mosher, DavidNatural Resources Canada, Dartmouth, NS, CanadaauthorErbacher, JochenBundesanstalt fuer Geowissenschaften und Rohstoffe (BGR), Federal Republic of GermanyauthorZuehlsdorff, LarsUniversitaet Bremen, Federal Republic of GermanyauthorMeyer, HeinrichauthorAmerican Association of Petroleum Geologists and Society for Sedimentary Geology, Tulsa, OK, United StatespublisherdocumentHardcopyIn: Anonymous, AAPG 2005 annual convention; abstracts volume14A96The Demerara Rise is a deep water extension of the continental margin north of Suriname and French Guyana, South America; conjugate to the Guinea Plateau of West Africa. It is in an ideal location to investigate late-stage Atlantic rifting and opening of the Atlantic Gateway in the Mid to Late Cretaceous and post-rift paleoceanography of the equatorial Atlantic. The northern extension of the Demerara Rise was surveyed with industry exploration and high resolution multichannel seismic reflection data. Five sites forming a depth transect were drilled during Ocean Drilling Program Leg 207. Seismic data demonstrate evidence of Jurassic to Cretaceous trans-tensional extension with synrift clastic sedimentation. By mid-Cretaceous, rifting had succeeded in providing a passage between South and North Atlantic Oceans resulting in a regional unconformity. During subsequent thermal subsidence, a consistently thick unit of approximately 90 m of black shale deposited between Cenomanian and Santonian times. Younger sediments are mostly calcareous chalks and oozes and include a distinct K/T impact interval distinguishable on seismic data, and the Paleocene-Eocene Thermal Maximum. Miocene erosion removed much of the Oligocene succession and normal faulting and mass-wasting continued throughout the rise's history. Total organic carbon contents in the black shales are up to 30 wt% during extreme ocean anoxic events. Rocks of similar age and lithology represent source rocks for an estimated 29% of the World's hydrocarbon supplies and equivalent formations source reserves in the nearby basins of Surinam, Guyana and Brazil.completedEconomic geology, geology of energy sourcesApplied geophysicsAtlantic OceanCenozoiccontinental marginCretaceousDemerara Riseextension tectonicsgeophysical methodsgeophysical profilesgeophysical surveysK-T boundaryLeg 207lower PaleoceneMesozoicNorth AtlanticNorthwest AtlanticOcean Drilling ProgramPaleocenePaleogenepetroleumpetroleum explorationplate tectonicsriftingseismic methodsseismic profilesshallow depthsource rocksSouth Americastratigraphic boundarySurinamsurveystectonicsTertiarytranstensionUpper Cretaceousurn:org.iodp:exp:207urnlargerWorkCitationcampaignEnglishgeoscientificInformation-80.000020.00000.000075.0000North AtlanticSurinam