Late quaternary sea bottom conditions in the southern Panama basin, Eastern Equatorial Pacific

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dc.citation.journalTitleJournal Of South American Earth Sciences
dc.contributor.authorPatarroyo, G.D.spa
dc.contributor.authorMartínez, J.I.spa
dc.contributor.departmentUniversidad EAFIT. Departamento de Geologíaspa
dc.contributor.researchgroupCiencias del Marspa
dc.date.accessioned2021-03-23T20:20:26Z
dc.date.available2021-03-23T20:20:26Z
dc.date.issued2015-11-01
dc.description.abstractA paleoceanographic reconstruction of the southern Panama Basin for the last 23.000 years, based on the benthic foraminiferal analysis from the deep sea core ME0005A-24JC (0.01 degrees N, 86.28 degrees W, water depth 2941) is presented. Cluster and SHEBI (SHE Analysis for Biozone Identification) analyses performed on the benthic foraminiferal assemblages, evidence a faunal turnover in the early Holocene at 14 Icy BR Between 23 and 14 ky BP, Fursenkoina rotundata, Hoeglundina elegans, Globobulimina affinis, Globobulimina pacifica, Cibicidoides wuellerstorfi and Uvigerina hispidocostata were common. Conversely, from 14 ky to the present, the assemblage is represented by Chilostomella oolina, Laticarinina pauperata, and Uvigerina proboscidea. This faunal turnover suggests significant fluctuations in oxygen content at the sea floor and the organic matter (OM) influx, which could reflect: (1) fluctuations in the surface productivity related to the equatorial divergence and, (2) OM advection caused by the dynamic of the deep sea currents. Paleoproductivity estimates and benthic foraminiferal rates depict a general trend towards lower values since the Last Glacial Maximum (LGM) with a conspicuous change at 14 ky BP. Therefore, the paleoceanographic reconstructions of the ME0005A-24JC core suggest a transition from La Nina-like conditions during the LGM to El Nino-like conditions in the recent, as previously proposed for the Eastern Equatorial Pacific. Estimates of the paleo-intensity of deep sea currents based on the relative percentage abundance of the epifaunal foraminifera Cibicidoides wuellerstorfi suggest stronger deep sea currents on the Carnegie Ridge before 14 Icy BR (C) 2015 Elsevier Ltd. All rights reserved.eng
dc.identifierhttps://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=1740
dc.identifier.doi10.1016/j.jsames.2015.07.010
dc.identifier.issn08959811
dc.identifier.issn18730647
dc.identifier.otherWOS;000363075900025
dc.identifier.otherSCOPUS;2-s2.0-84941273733
dc.identifier.urihttp://hdl.handle.net/10784/26892
dc.language.isoengeng
dc.publisherPERGAMON-ELSEVIER SCIENCE LTD
dc.relation.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84941273733&doi=10.1016%2fj.jsames.2015.07.010&partnerID=40&md5=bca1fa48ac449ca5f0b6a152a02e640e
dc.rightshttps://v2.sherpa.ac.uk/id/publication/issn/0895-9811
dc.sourceJournal Of South American Earth Sciences
dc.subject.keywordBenthic foraminiferaeng
dc.subject.keywordDeep sea sedimentseng
dc.subject.keywordLast glacial maximumeng
dc.subject.keywordPaleoceanographyeng
dc.subject.keywordPanama basineng
dc.titleLate quaternary sea bottom conditions in the southern Panama basin, Eastern Equatorial Pacificeng
dc.typeinfo:eu-repo/semantics/articleeng
dc.typearticleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.typepublishedVersioneng
dc.type.localArtículospa

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