georefid:2005-071772SEDIS 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=2005-0717722004-01-01publicationgeorefid:2005-071772Yoo, ChanminKorea Ocean Research and Development Institute, Deep-Sea Resources Research Center, Seoul, South KoreaauthorHyeong, KiseongauthorKim, Ki-HyuneauthorGeological Society of America (GSA), Boulder, CO, United StatespublisherdocumentHardcopyIn: Anonymous, Geological Society of America, 2004 annual meeting36 (5)293To delineate late Pleistocene paleoceanographic change of the West Pacific, we analyzed the oxygen and carbon isotopic ratios of two planktonic foraminifera species (G. sacculifer and N. dutertrei) from a piston core (KODOS-313) taken from the West Equatorial Pacific (02 degrees 00'N, 164 degrees 33'E), and they are compared with the published results of the East Pacific (ODP site 847 and RC 11-210), in terms of relative amounts and mass accumulation rates of CaCO (sub 3) and eolian component, back to marine isotopic stage (MIS) 6. Differences in oxygen and carbon isotope values between two foraminifera species (0.75 permil in delta (super 18) O, 0.05 permil in delta (super 13) C) are less than those of the East Pacific (1.30 permil in delta (super 18) O, 0.14 permil in delta (super 13) C), which indicates smaller vertical contrasts in both temperature and nutrient between mixing-zone and thermocline in the West Pacific. Strong deviation in delta (super 18) O of G. sacculifer from SPECMAP suggests the carbonate fraction of KODOS-313 was subjected to partial dissolution by bottom water under lysocline. Lower accumulation rates of CaCO (sub 3) and eolian component during glacial times are likely due to low sedimentation rate (ave. 0.75cm/1000 yr) combined with carbonate dissolution in KODOS-313 site. However, the high CaCO (sub 3) contents during the glacial periods clearly follow the general pattern of equatorial Pacific Oocean.completedQuaternary geologyIsotope geochemistrybiochemistryC-13/C-12calcium carbonatecarbonCenozoicEast PacificEquatorial PacificForaminiferaglacial environmentGlobigerinaceaGlobigerinidaeGlobigerinoidesGlobigerinoides sacculiferInvertebrataisotope ratiosisotopesLeg 138microfossilsmixingNeogloboquadrinaNeogloboquadrina dutertreinutrientsO-18/O-16Ocean Drilling ProgramODP Site 847oxygenPacific Oceanpaleo-oceanographypaleotemperatureplanktonic taxaPleistoceneProtistaQuaternaryRotaliinasedimentationsedimentation ratessolutionstable isotopesupper Pleistoceneurn:org.iodp:exp:138urnlargerWorkCitationcampaignurn:org.iodp:exp:138:site:847urnlargerWorkCitationstudyurn:org.iodp:exp:138urnlargerWorkCitationcampaignEnglishgeoscientificInformation-95.1914-95.19110.11340.1136