Sedimentary metal ratios in the Colombia Basin as indicators for water balance change in northern South America during the past 400,000 years

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dc.citation.journalTitlePaleoceanography
dc.contributor.authorMora, Germánspa
dc.contributor.authorMartínez, J.spa
dc.contributor.departmentUniversidad EAFIT. Departamento de Geologíaspa
dc.contributor.researchgroupCiencias del Marspa
dc.date.accessioned2021-03-23T20:20:22Z
dc.date.available2021-03-23T20:20:22Z
dc.date.issued2005-11-15
dc.description.abstractRecent paleoclimate reconstructions for northern South America suggest changes in moisture balance interpreted to result from shifts in the mean latitudinal position of the Intertropical Convergence Zone (ITCZ). Because most of these records only extend back to the last glacial interval, we measured metal abundances in sediments from Ocean Drilling Program Core 999A in the Caribbean Sea spanning the last 400 kyr to evaluate glacial/interglacial fluctuations in the water balance of northern South America. Variations in sedimentary Al/Ti, K/Ti, Fe/Ti, and Fe/Al ratios are interpreted to reflect changes in riverine input through the Magdalena River. The measured metal ratios show a strong 100-kyr cyclicity, which could reflect changes in sedimentation related to sea level fluctuations or to climate. Although the variability in Fe/ Ti and Fe/Al ratios points to rainfall-induced changes in the mineralogy of the terrigenous fraction, shelf erosion induced by sea level fluctuations cannot completely be ruled out. If climate accounted for changes in the nature of the terrigenous components, then the strong 100-kyr fluctuations in the measured metal ratios would point to the influence of high-latitude climate on the local hydrological balance of northern South America with ice volume growth forcing a southward displacement of the ITCZ. Copyright 2005 by the American Geophysical Union.eng
dc.identifierhttps://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=1179
dc.identifier.doi10.1029/2005PA001132
dc.identifier.issn08838305
dc.identifier.issn19449186
dc.identifier.otherWOS;000233588900001
dc.identifier.otherSCOPUS;2-s2.0-32944464812
dc.identifier.urihttp://hdl.handle.net/10784/26864
dc.language.isoengeng
dc.publisherAMER GEOPHYSICAL UNION
dc.relation.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-32944464812&doi=10.1029%2f2005PA001132&partnerID=40&md5=d99de0047c8042380e563d196d1b7a0a
dc.rightshttps://v2.sherpa.ac.uk/id/publication/issn/0883-8305
dc.sourcePaleoceanography
dc.subject.keywordpaleoclimateeng
dc.subject.keywordpaleohydrologyeng
dc.subject.keywordQuaternaryeng
dc.subject.keywordSouth Americaeng
dc.titleSedimentary metal ratios in the Colombia Basin as indicators for water balance change in northern South America during the past 400,000 yearseng
dc.typeinfo:eu-repo/semantics/articleeng
dc.typearticleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.typepublishedVersioneng
dc.type.localArtículospa

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