georefid:2012-078565SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1016/j.gca.2012.03.035<gco:CharacterString>Thorium-derived dust fluxes to the tropical Pacific Ocean, 58 Ma</gco:CharacterString>2012-01-01publicationgeorefid:2012-078565doi:10.1016/j.gca.2012.03.035Woodard, S. C.Texas A&M University, Department of Oceanography, College Station, TX, United StatesauthorThomas, D. J.authorMarcantonio, F.authorElsevier, New York, NY, InternationalpublisherdocumentHardcopyGeochimica et Cosmochimica Acta87194-209Eolian dust in pelagic deep sea sediments can be used to reconstruct ancient wind patterns and paleoenvironmental response to climate change. Traditional methods to determine dust accumulation involve isolating the non-dissolvable aluminosilicate minerals from deep sea sediments through a series of chemical leaches, but cannot differentiate between minerals from eolian, authigenic and volcanogenic sources. Other geochemical proxies, such as sedimentary (super 232) Th and crustal (super 4) He content, have been used to construct high-resolution records of atmospheric dust fluxes to the deep sea during the Quaternary. Here we use sedimentary Th content as a proxy for terrigenous material (eolian dust) in nearly equal 58 Myr-old sediments from the Shatsky Rise (ODP Site 1209) and compare our results with previous dust estimates generated using the traditional chemical extraction method and sedimentary (super 4) He (sub crustal) concentrations. We find excellent agreement between Th-based dust estimates and those generated using the traditional method. In addition our results show a correlation between sedimentary Th and (super 4) He (sub crustal) content, which suggests a source older than present day Asian loess supplied dust to the central subtropical Pacific Ocean during the early Paleogene. Abstract Copyright (2012) Elsevier, B.V.completedIsotope geochemistrySedimentary petrologyactinidesCenozoicchemical compositionclastic sedimentsclimate changeDeep Sea Drilling ProjectDSDP Site 463dustEast PacificEquatorial PacificgeochemistryHe-4heliumIPODisotopesLeg 130Leg 138Leg 198Leg 199Leg 62marine sedimentationmarine sedimentsmetalsMid-Pacific Mountainsnoble gasesNorth PacificNortheast PacificNorthwest PacificOcean Drilling ProgramODP Site 1209ODP Site 1215ODP Site 806ODP Site 849Ontong Java PlateauPacific OceanPaleocenepaleoclimatologypaleoenvironmentPaleogenepelagic environmentQuaternaryradioactive isotopessedimentationsedimentation ratessedimentsShatsky Risestable isotopesTertiaryTh-232thoriumtropical environmentWest Pacificurn:org.iodp:exp:130urnlargerWorkCitationcampaignurn:org.iodp:exp:138urnlargerWorkCitationcampaignurn:org.iodp:exp:198urnlargerWorkCitationcampaignurn:org.iodp:exp:199urnlargerWorkCitationcampaignurn:org.iodp:exp:62urnlargerWorkCitationcampaignurn:org.iodp:exp:62:site:463urnlargerWorkCitationstudyurn:org.iodp:exp:62urnlargerWorkCitationcampaignurn:org.iodp:exp:198:site:1209urnlargerWorkCitationstudyurn:org.iodp:exp:198urnlargerWorkCitationcampaignurn:org.iodp:exp:199:site:1215urnlargerWorkCitationstudyurn:org.iodp:exp:199urnlargerWorkCitationcampaignurn:org.iodp:exp:130:site:806urnlargerWorkCitationstudyurn:org.iodp:exp:130urnlargerWorkCitationcampaignurn:org.iodp:exp:138:site:849urnlargerWorkCitationstudyurn:org.iodp:exp:138urnlargerWorkCitationcampaignEnglishgeoscientificInformation158.3000158.310032.390032.4000Includes appendices