georefid:2005-035030SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2005-035030<gco:CharacterString>Changes in Southern Ocean circulation in late Oligocene to early Miocene time</gco:CharacterString>2004-01-01publicationgeorefid:2005-035030Pfuhl, Helen A.Max Planck Institute for Biogeochemistry, Jena, Federal Republic of GermanyauthorMcCave, I. NicholasUniversity of California at Santa Barbara, United StatesauthorSchellenberg, Stephen A.Texas A&M University, United StatesauthorFerretti, PatriziaUniversity of Cambridge, United KingdomauthorAmerican Geophysical Union, Washington, DC, United StatespublisherdocumentHardcopyIn: Exon, Neville F. (editor), Kennett, James P. (editor), Malone, Mitchell (editor), The Cenozoic Southern Ocean; tectonics, sedimentation, and climate change between Australia and Antarctica151173-189Benthic stable isotopic measurements from four ODP Leg 189 sites, in and near the Tasmanian Gateway, link existing southern high latitude records from the Oligocene. Bulk sediment isotopic analyses at Sites 1170-1172 present the first moderate resolution, high latitude "planktic" late Oligocene to early Miocene data. Stable isotopes and records of carbonate content suggest similar surface hydrography for southern Sites 1170-1171, and strongly reduced offsets at Site 1172 to the north. Greater offsets of 1170-1172 benthic (super 18) O from southern Kerguelen Plateau values, continuing until 25.4 Ma, cast doubt on hypotheses of earlier development of circum-Antarctic circulation and therefore deep opening of the Drake Passage. The data also suggest that Southern Hemisphere temperatures in this area were relatively warm throughout the late Oligocene, consistent with published Mg/Ca temperature reconstructions for bottom waters. (modif. j. abstr.)completedStratigraphyAntarctic Bottom WaterAntarctic Circumpolar CurrentAntarctic ice sheetAntarcticaC-13/C-12carbonCenozoicDrake PassageForaminiferaInvertebrataisotope ratiosisotopesKerguelen PlateauLeg 189lower MioceneMaud RisemicrofossilsMioceneNeogeneO-18/O-16ocean circulationOcean Drilling ProgramODP Site 1168ODP Site 1170ODP Site 1171ODP Site 1172Oligoceneoxygenpaleo-oceanographypaleobathymetrypaleoclimatologyPaleogenepaleotemperatureProtistaSouthern Oceanstable isotopesTasmanian GatewayTertiaryupper OligoceneWeddell Seaurn:org.iodp:exp:189urnlargerWorkCitationcampaignurn:org.iodp:exp:189:site:1168urnlargerWorkCitationstudyurn:org.iodp:exp:189urnlargerWorkCitationcampaignurn:org.iodp:exp:189:site:1170urnlargerWorkCitationstudyurn:org.iodp:exp:189urnlargerWorkCitationcampaignurn:org.iodp:exp:189:site:1171urnlargerWorkCitationstudyurn:org.iodp:exp:189urnlargerWorkCitationcampaignurn:org.iodp:exp:189:site:1172urnlargerWorkCitationstudyurn:org.iodp:exp:189urnlargerWorkCitationcampaignEnglishgeoscientificInformation144.2400149.5600-48.3000-42.3600