georefid:2008-120598SEDIS 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=2008-1205982008-01-01publicationgeorefid:2008-120598Lazarus, David B.Humboldt Universitaet zu Berlin, Museum fuer Naturkunde, Berlin, Federal Republic of GermanyauthorHollis, Christopher J.GNS Science, New ZealandauthorApel, M.GNS Science, New ZealandauthorAmerican Museum of Natural History, New York, NY, United StatespublisherdocumentHardcopyIn: Lazarus, David B. (editor), Hollis, Christopher J. (editor), Radiolarians in paleoceanography; selected papers from InterRad XI54 (1)41-48The timing of the origin of the Southern Ocean is important for studies of Antarctic biologic evolution and for understanding past climate change. The long standing theory that separation of Australia from Antarctica at the end of the Eocene allowed the development of a circumpolar ocean circulation, isolating the Antarctic continent and causing ice-sheet growth at the Eocene-Oligocene boundary, has recently been challenged by ODP Leg 189 drilling south of Australia. Based on these new cores it has been proposed that separation and Southern Ocean formation had already occurred within the late Eocene, approximately 2 my before the Antarctic became glaciated. This proposal however extrapolates data from a limited area to the history of a large circumpolar ocean region. To better determine Southern Ocean history we have compiled data from a large number of locations around Antarctica on opal accumulation and have analyzed circum-polar radiolarian faunas for development of endemism and evolutionary turnover. Our results show that opal deposition was widespread in the late Eocene Antarctic oceans with concentrations similar to that of the early Oligocene; substantial endemism was already present in late Eocene radiolarian faunas, and that most evolutionary turnover, in particular the origin of taxa characteristic of the early Oligocene, had already taken place within the late Eocene (ca 35 Ma). We conclude that there is a significant (ca 2 my) gap between a late Eocene Southern Ocean origin and later, Eocene-Oligocene boundary Antarctic glaciation.completedStratigraphyAntarcticaassemblagesbiogeographybiologic evolutionCenozoicDeep Sea Drilling ProjectDSDP Site 206DSDP Site 207DSDP Site 245DSDP Site 253DSDP Site 254DSDP Site 255DSDP Site 264DSDP Site 267DSDP Site 274DSDP Site 277DSDP Site 280DSDP Site 281DSDP Site 283DSDP Site 329DSDP Site 357DSDP Site 359DSDP Site 360DSDP Site 361DSDP Site 511DSDP Site 512DSDP Site 592DSDP Site 593extinctionframework silicatesglaciationInvertebrataIPODLeg 113Leg 114Leg 119Leg 120Leg 121Leg 177Leg 181Leg 182Leg 183Leg 189Leg 21Leg 25Leg 26Leg 28Leg 29Leg 36Leg 39Leg 40Leg 71Leg 90microfossilsOcean Drilling ProgramODP Site 1090ODP Site 1123ODP Site 1124ODP Site 1126ODP Site 1128ODP Site 1138ODP Site 1170ODP Site 1171ODP Site 1172ODP Site 689ODP Site 693ODP Site 699ODP Site 701ODP Site 703ODP Site 704ODP Site 737ODP Site 738ODP Site 748ODP Site 750ODP Site 752ODP Site 753ODP Site 754ODP Site 755ODP Site 756opalpaleoenvironmentPaleogenepaleogeographyProtistaRadiolariasilica mineralssilicatesSouthern 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