georefid:2000-018089SEDIS 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=2000-0180891999-01-01publicationgeorefid:2000-018089O'Connell, SuzanneWesleyan University, Department of Earth and Environmental Sciences, Middletown, CT, United StatesauthorVenherm, ClaudiaauthorAmerican Association of Petroleum Geologists and Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United StatespublisherdocumentHardcopyIn: Anonymous, American Association of Petroleum Geologists 1999 annual meeting1999A101-A102Feni Drift, carbonate-rich North Atlantic drift east of Rockall Bank was drilled during ODP Leg 162 at Sites 980 and 981. Site 981 recovered a complete Pleistocene section with sedimentation rates of approximately 4-6 cm/kyr. Whole core magnetic susceptibility records, and discrete carbonate and grain-size measurements on an approximately 200-kyr section with 5 glacial-interglacial cycles were analyzed. Higher magnetic susceptibility is equated with increased terrigeneous input and glacial conditions. Higher carbonate percentage is equated with warmer, interglacial conditions. Coarser size of the mean sortable silt (10-63 micron fraction) is equated with stronger bottom currents. Sedimentation rates are tuned to 41 kyr, by setting the lowest magnetic susceptibility value as the maximum glacial for each cycle. Within a cycle sedimentation rates are held constant. Carbonate and magnetic susceptibility vary roughly in phase. And in all but the upper most cycle bottom current strength begins to increase during the early glacial, reaching a maximum during the early interglacial. In all cycles, preceding the maximum carbonate value (maximum interglacial), there is a cooling interval of less than 6-kyr duration. The magnitude of the change varies from about 2% to about 12% carbonate and commonly coincides with a change in bottom current strength. We suggest that these intervals may be similar to Younger Dryas type events.completedQuaternary geologyAtlantic OceanCenozoicclastic sedimentscoolingcorescurrentscyclesFeni Driftglacial environmentinterglacial environmentLeg 162magnetic susceptibilitymiddle PleistoceneNorth AtlanticOcean Drilling Programpaleo-oceanographypaleomagnetismpaleotemperaturePleistoceneQuaternaryRockall Banksedimentationsedimentation ratessedimentssiltsortingupper Pleistoceneupper WeichselianWeichselianYounger Dryasurn:org.iodp:exp:162urnlargerWorkCitationcampaignEnglishgeoscientificInformation-80.000020.00000.000077.2026North Atlantic