georefid:2012-037638SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1126/science.1214697<gco:CharacterString>Lithium isotope history of Cenozoic seawater; changes in silicate weathering and reverse weathering</gco:CharacterString>2012-01-01publicationgeorefid:2012-037638doi:10.1126/science.1214697Misra, SambuddhaFlorida State University, National High Magnetic Field Laboratory, Tallahassee, FL, United StatesauthorFroelich, Philip N.Froelich Education Services, United StatesauthorAmerican Association for the Advancement of Science, Washington, DC, United StatespublisherdocumentDigitalScience335 (6070)818-823Weathering of uplifted continental rocks consumes carbon dioxide and transports cations to the oceans, thereby playing a critical role in controlling both seawater chemistry and climate. However, there are few archives of seawater chemical change that reveal shifts in global tectonic forces connecting Earth ocean-climate processes. We present a 68-million-year record of lithium isotopes in seawater (delta (super 7) Li (sub SW) ) reconstructed from planktonic foraminifera. From the Paleocene (60 million years ago) to the present, delta (super 7) Li (sub SW) rose by 9 ppm, requiring large changes in continental weathering and seafloor reverse weathering that are consistent with increased tectonic uplift, more rapid continental denudation, increasingly incongruent continental weathering (lower chemical weathering intensity), and more rapid CO (sub 2) drawdown. A 5ppm drop in delta (super 7) Li (sub SW) across the Cretaceous-Paleogene boundary cannot be produced by an impactor or by Deccan trap volcanism, suggesting large-scale continental denudation.completedStratigraphyIsotope geochemistryalkali metalsAtlantic OceanCeara RiseCenozoicchemostratigraphycorrelationCretaceousEquatorial AtlanticgeochemistryIndian Oceanisotope ratiosisotopesK-T boundaryLeg 121Leg 154Leg 208Li-7/Li-6lithiumlower PaleoceneMesozoicmetalsNinetyeast RidgeNorth AtlanticOcean Drilling ProgramODP Site 1262ODP Site 1263ODP Site 1265ODP Site 1267ODP Site 757ODP Site 758ODP Site 926Os-187/Os-186osmiumpaleo-oceanographyPaleocenePaleogeneplatinum groupradioactive isotopessea watersilicatesSouth Atlanticstable isotopesstratigraphic boundaryTertiaryUpper CretaceousWalvis Ridgeweatheringurn:org.iodp:exp:121urnlargerWorkCitationcampaignurn:org.iodp:exp:154urnlargerWorkCitationcampaignurn:org.iodp:exp:208urnlargerWorkCitationcampaignurn:org.iodp:exp:208:site:1262urnlargerWorkCitationstudyurn:org.iodp:exp:208urnlargerWorkCitationcampaignurn:org.iodp:exp:208:site:1263urnlargerWorkCitationstudyurn:org.iodp:exp:208urnlargerWorkCitationcampaignurn:org.iodp:exp:208:site:1265urnlargerWorkCitationstudyurn:org.iodp:exp:208urnlargerWorkCitationcampaignurn:org.iodp:exp:208:site:1267urnlargerWorkCitationstudyurn:org.iodp:exp:208urnlargerWorkCitationcampaignurn:org.iodp:exp:121:site:757urnlargerWorkCitationstudyurn:org.iodp:exp:121urnlargerWorkCitationcampaignurn:org.iodp:exp:121:site:758urnlargerWorkCitationstudyurn:org.iodp:exp:121urnlargerWorkCitationcampaignurn:org.iodp:exp:154:site:926urnlargerWorkCitationstudyurn:org.iodp:exp:154urnlargerWorkCitationcampaignEnglishgeoscientificInformation-46.000092.0000-40.00008.0000Ceara RiseNinetyeast RidgeWalvis RidgeSupplemental information/data is available in the online version of this article; related article by Paytan, A., on p. 810-811application/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://www.sciencemag.org/content/335/6070/818.full.pdfdownload