georefid:2006-060010georefid:2006-060007SEDIS 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=10.2973/odp.proc.sr.183.014.20032003-01-01publicationgeorefid:2006-060010doi:10.2973/odp.proc.sr.183.014.2003Arney, James E.Florida State University, Department of Geology, Tallahassee, FL, United StatesauthorWise, Sherwood W., Jr.University of Texas at Austin, United StatesauthorTexas A&M University, Ocean Drilling Program, College Station, TX, United StatespublisherdocumentDigitalIn: Frey, Frederick A., Coffin, Millard F., Wallace, Paul J., Antretter, Maria J., Arndt, Nicholas T., Barling, Jane, Boehem, Florian, Borre, Mai Kirstine, Coxall, Helen K., Damuth, John E., Delius, Heike, Duncan, Robert A., Inokuchi, Hiroo, Keszthelyi, Laszlo, Mahoney, John J., Moore, C. Leah, Mueller, R. Dietmar, Neal, Clive R., Nicolaysen, Kirsten E., Pringle, Malcolm S., Reusch, Douglas N., Saccocia, Peter J., Teagle, Damon A. H., Waehnert, Veronika, Weis, Dominique A. M., Wise, Sherwood W., Zhao, Xixi, Quilty, Patrick G. (editor), Proceedings of the Ocean Drilling Program; scientific results; Kerguelen Plateau-Broken Ridge; a large igneous province; covering Leg 183 of the cruises of the drilling vessel JOIDES Resolution; Fremantle, Australia, to Fremantle, Australia; Sites 1135-1142; 7 December 1998-11 February 1999183Cores from Sites 1135, 1136, and 1138 of Ocean Drilling Program Leg 183 to the Kerguelen Plateau (KP) provide the most complete Paleocene and Eocene sections yet recovered from the southern Indian Ocean. These nannofossil-foraminifer oozes and chalks provide an opportunity to study southern high-latitude biostratigraphic and paleoceanographic events, which is the primary subject of this paper. In addition, a stable isotope profile was established across the Cretaceous/Tertiary (K/T) boundary at Site 1138. An apparently complete K/T boundary was recovered at Site 1138 in terms of assemblage succession, isotopic signature, and reworking of older (Cretaceous) nannofossil taxa. There is a significant color change, a negative carbon isotope shift, and nannofossil turnover. The placement of the boundary based on these criteria, however, is not in agreement with the available shipboard paleomagnetic stratigraphy. We await shore-based paleomagnetic study to confirm or deny those preliminary results. The Paleocene nannofossil assemblage is, in general, characteristic of the high latitudes with abundant Chiasmolithus, Prinsius, and Toweius. Placed in context with other Southern Ocean sites, the biogeography of Hornibrookina indicates the presence of some type of water mass boundary over the KP during the earliest Paleocene. This boundary disappeared by the late Paleocene, however, when there was an influx of warm-water discoasters, sphenoliths, and fasciculiths. This not only indicates that during much of the late Paleocene water temperatures were relatively equable, but preliminary floral and stable isotope analyses also indicate that a relatively complete record of the late Paleocene Thermal Maximum event was recovered at Site 1135. It was only at the beginning of the middle Eocene that water temperatures began to decline and the nannofossil assemblage became dominated by cool-water species while discoaster and sphenolith abundances and diversity were dramatically reduced. One new taxonomic combination is proposed, Heliolithus robustus Arney, Ladner, and Wise.completedStratigraphyalgaebiostratigraphyC-13/C-12carbonCenozoicCretaceousEoceneIndian Oceanisotope ratiosisotopesK-T boundaryKerguelen PlateauLeg 183lower PaleoceneMesozoicmicrofossilsnannofossilsO-18/O-16Ocean Drilling ProgramODP Site 1135ODP Site 1136ODP Site 1138oxygenpaleo-oceanographyPaleocenepaleoenvironmentPaleogenepaleotemperaturePlantaereconstructionSouthern Oceanspecies diversitystable isotopesstratigraphic boundaryTertiaryUpper Cretaceousurn:org.iodp:exp:183urnlargerWorkCitationcampaignurn:org.iodp:exp:183:site:1135urnlargerWorkCitationstudyurn:org.iodp:exp:183urnlargerWorkCitationcampaignurn:org.iodp:exp:183:site:1136urnlargerWorkCitationstudyurn:org.iodp:exp:183urnlargerWorkCitationcampaignurn:org.iodp:exp:183:site:1138urnlargerWorkCitationstudyurn:org.iodp:exp:183urnlargerWorkCitationcampaignEnglishgeoscientificInformation75.583084.5006-59.4200-53.5506Includes appendix; available only on CD-ROM in PDF format and on the Web in PDF or HTMLapplication/pdfunknownSEDIS Publication Catalogue

ana.macario@awi.de

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