georefid:2007-120394SEDIS 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=10.3133/of2007-1047.srp0372007-01-01publicationgeorefid:2007-120394doi:10.3133/of2007-1047.srp037Verducci, M.University of Siena, Department of Earth Sciences, Siena, ItalyauthorForesi, L. M.GNS Science, New ZealandauthorScott, G. H.Consiglio Nazionale delle Ricerche, ItalyauthorTiepolo, M.authorSprovieri, M.authorLirer, F.authorU. S. Geological Survey, Reston, VA, United StatespublisherdocumentDigitalIn: Cooper, Alan (editor), Raymond, Carol (editor), Antarctica; a keystone in a changing world; online proceedings for the Tenth international symposium on Antarctic earth sciencesOF 2007-1047Regarding Kerguelen Plateau region of the Southern Ocean during the middle Miocene (14.8-11.8 Ma), abundance fluctuations of several planktonic foraminiferal taxa, stable oxygen isotope and Mg/Ca ratios have been integrated as a multi-proxy approach to reach a better understanding of the growth modality and fluctuations of the East Antarctic Ice Sheet (EAIS) during this period. A 7 degrees C decrease in Sea Surface Temperature (SST), an abrupt turnover in the planktonic foraminiferal assemblage, a 1.5% shift towards heavier delta (super 18) O values (Mi3 event) and a related shift towards heavier seawater delta (super 18) O values between 13.9 and 13.7 Ma, are interpreted to reflect rapid surface water cooling and EAIS expansion. Hole 747A data suggest a major change in the variability of the climate system fostered by EAIS expansion between 13.9 and 13.7 Ma. Ice sheet fluctuations were greater during the interval 14.8-13.9 Ma compared with those from 13.7 to 11.8 Ma, whereas the latter interval was characterized by a more stable EAIS. In our opinion, the middle Miocene ice sheet expansion in Antarctica represents a first step towards the development of the modern permanent ice sheet.completedStratigraphyalkaline earth metalsAntarctic ice sheetAntarcticabiochemistrybiostratigraphycalciumCenozoicEast Antarctic ice sheetForaminiferageochemistryInvertebrataisotope ratiosisotopesKerguelen PlateauLeg 120magnesiummetalsMg/Camicrofossilsmiddle MioceneMioceneNeogeneO-18/O-16Ocean Drilling ProgramODP Site 747oxygenpaleoclimatologyProtistaSouthern Oceanstable isotopesTertiaryUSGSurn:org.iodp:exp:120urnlargerWorkCitationcampaignurn:org.iodp:exp:120:site:747urnlargerWorkCitationstudyurn:org.iodp:exp:120urnlargerWorkCitationcampaignEnglishgeoscientificInformation76.473876.4739-54.4841-54.4840application/pdfunknownSEDIS Publication Catalogue

ana.macario@awi.de

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