georefid:2006-018341SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1029/2004PA001046<gco:CharacterString>Limited range of interspecific vital effects in coccolith stable isotopic records during the Paleocene-Eocene Thermal Maximum</gco:CharacterString>2005-01-01publicationgeorefid:2006-018341doi:10.1029/2004PA001046Stoll, Heather M.Williams College, Geosciences Department, Williamstown, MA, United StatesauthorAmerican Geophysical Union, Washington, DC, United StatespublisherdocumentDigitalPaleoceanography20 (1)Small but significant differences exist among stable carbon and oxygen isotopic excursions measured in coccolith-dominated bulk carbonate and planktic foraminifera during the Paleocene-Eocene thermal maximum (PETM). One hypothesis suggests that the bulk carbonate isotopic record is compromised by changing nannofossil assemblages, since modern nannofossils show a large (5 permil) range of interspecific vital effects. New techniques are employed here to separate different size fractions of coccoliths from PETM sediments at ODP Site 690 for isotopic analysis, removing a major portion of the variation in nannofossil assemblages. Isotopic compositions of coarse and fine coccolith fractions dominated by coccoliths of genus Chiasmolithus and Toweius, respectively, differ by less than 0.5 permil for both oxygen and carbon. The near-monogeneric Toweius record closely parallels the main trends in the bulk carbonate isotope records, including multiple steps in the negative carbon isotopic excursion, suggesting that the trends in the bulk carbonate record are not artifacts of changing species assemblages. (mod. journ. abst.)completedStratigraphyIsotope geochemistryalgaeassemblagesbiochemistryC-13/C-12carboncarbon dioxideCenozoicCoccolithophoraceaecoresdiagenesisEoceneForaminiferageochemistryInvertebrataisotope ratiosisotopesLeg 113marine environmentmarine sedimentsMaud RisemicrofossilsnannofossilsO-18/O-16Ocean Drilling ProgramODP Site 690oxygenpaleo-oceanographyPaleocenePaleocene-Eocene Thermal MaximumPaleogenePETMPlantaeProtistasedimentsSouthern Oceanstable isotopesTertiaryWeddell Seaurn:org.iodp:exp:113urnlargerWorkCitationcampaignurn:org.iodp:exp:113:site:690urnlargerWorkCitationstudyurn:org.iodp:exp:113urnlargerWorkCitationcampaignEnglishgeoscientificInformation1.12181.1218-65.0938-65.0937application/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://www.agu.org/journals/pa/pa0501/2004PA001046/2004PA001046.pdfdownload