georefid:2009-040976SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1126/science.1163614<gco:CharacterString>A dynamic marine calcium cycle during the past 28 million years</gco:CharacterString>2008-01-01publicationgeorefid:2009-040976doi:10.1126/science.1163614Griffith, Elizabeth M.Stanford University, Department of Geological and Environmental Sciences, Stanford, CA, United StatesauthorPaytan, AdinaUniversity of California, Santa Cruz, United StatesauthorCaldeira, KenCarnegie Institution of Washington, United StatesauthorBullen, Thomas D.U. S. Geological Survey, United StatesauthorThomas, EllenYale University, United StatesauthorAmerican Association for the Advancement of Science, Washington, DC, United StatespublisherdocumentDigitalScience322 (5908)1671-1674Multiple lines of evidence have shown that the isotopic composition and concentration of calcium in seawater have changed over the past 28 million years. A high-resolution, continuous seawater calcium isotope ratio curve from marine (pelagic) barite reveals distinct features in the evolution of the seawater calcium isotopic ratio suggesting changes in seawater calcium concentrations. The most pronounced increase in the delta (super 44/40) Ca value of seawater (of 0.3 per mil) occurred over roughly 4 million years following a period of low values around 13 million years ago. The major change in marine calcium corresponds to a climatic transition and global change in the carbon cycle and suggests a reorganization of the global biogeochemical system.completedStratigraphyIsotope geochemistryalkaline earth metalsbariteCa-44/Ca-40calciumcalcium carbonatecarboncarbon cycleCenozoicclimate changeDeep Sea Drilling ProjectDSDP Site 572DSDP Site 575East PacificEquatorial Pacificgeochemical cycleIPODisotope ratiosisotopesLeg 199Leg 85marine environmentmetalsMioceneNeogeneNorth PacificNortheast PacificOcean Drilling ProgramODP Site 1218ODP Site 1219Pacific Oceanpaleo-oceanographypaleoclimatologyPaleogenepelagic environmentQuaternarysulfatesTertiaryupper Paleogenestable isotopesurn:org.iodp:exp:199urnlargerWorkCitationcampaignurn:org.iodp:exp:85urnlargerWorkCitationcampaignurn:org.iodp:exp:85:site:572urnlargerWorkCitationstudyurn:org.iodp:exp:85urnlargerWorkCitationcampaignurn:org.iodp:exp:85:site:575urnlargerWorkCitationstudyurn:org.iodp:exp:85urnlargerWorkCitationcampaignurn:org.iodp:exp:199:site:1218urnlargerWorkCitationstudyurn:org.iodp:exp:199urnlargerWorkCitationcampaignurn:org.iodp:exp:199:site:1219urnlargerWorkCitationstudyurn:org.iodp:exp:199urnlargerWorkCitationcampaignEnglishgeoscientificInformation-148.0000-113.50300.295426.0500application/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://www.sciencemag.org/content/322/5908/1671.full.pdfdownload