Do geochemical estimates of sediment focusing pass the sediment test in the equatorial Pacific?

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dc.citation.journalTitlePaleoceanography
dc.contributor.authorLyle, Mspa
dc.contributor.authorMitchell, Nspa
dc.contributor.authorPisias, Nspa
dc.contributor.authorMix, Aspa
dc.contributor.authorMartinez, JIspa
dc.contributor.authorPaytan, Aspa
dc.contributor.departmentUniversidad EAFIT. Departamento de Geologíaspa
dc.contributor.researchgroupCiencias del Marspa
dc.date.accessioned2021-03-23T20:20:24Z
dc.date.available2021-03-23T20:20:24Z
dc.date.issued2005-01-28
dc.description.abstractThe paleoceanographic recording fidelity of pelagic sediments is limited by chemical diagenesis and physical mixing (bioturbation and horizontal sediment transport). Diagenesis and bioturbation are relatively well-studied, but the effects of physical sedimentation have been largely ignored. Modeling U series isotopes (e.g., 230Th) can potentially quantify horizontal sediment movement, but model horizontal sediment focusing often equals or exceeds the vertical particle rain. We find no evidence of this level of sediment focusing in the equatorial Pacific from geophysical data or sediment core comparisons. The overestimate of sediment focusing by 230Th is probably caused by poor model assumptions: that sediment does not fractionate (does not sort according to size during transport) and that 230Th cannot leak from slowly accumulating sediments. Both assumptions are weak. U series methods do hold promise to quantify sediment focusing if properly calibrated. With calibration the trade-offs between seeking high sedimentation rates for better time resolution and the blurring by horizontal sediment focusing can be better assessed. Copyright 2005 by the American Geophysical Union.eng
dc.identifierhttps://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=1486
dc.identifier.doi10.1029/2004PA001019
dc.identifier.issn08838305
dc.identifier.issn19449186
dc.identifier.otherWOS;000226687200001
dc.identifier.otherSCOPUS;2-s2.0-20844440505
dc.identifier.urihttp://hdl.handle.net/10784/26879
dc.language.isoengeng
dc.publisherAMER GEOPHYSICAL UNION
dc.relation.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-20844440505&doi=10.1029%2f2004PA001019&partnerID=40&md5=d395b4ae12499263099e063e5f0f9312
dc.rightshttps://v2.sherpa.ac.uk/id/publication/issn/0883-8305
dc.sourcePaleoceanography
dc.subject.keywordgeochemistryeng
dc.subject.keywordpaleoceanographyeng
dc.subject.keywordsedimentologyeng
dc.subject.keywordoceanic regionseng
dc.subject.keywordPacific Oceaneng
dc.subject.keywordPacific Ocean (Equatorial)eng
dc.subject.keywordWorldeng
dc.titleDo geochemical estimates of sediment focusing pass the sediment test in the equatorial Pacific?eng
dc.typeinfo:eu-repo/semantics/articleeng
dc.typearticleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.typepublishedVersioneng
dc.type.localArtículospa

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