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dc.contributor.author Cordoba, Francisco Elizalde
dc.contributor.author Piovano, Eduardo Luis
dc.contributor.author Guerra, Lucía
dc.contributor.author Mulsow, Sandor
dc.contributor.author Sylvestre, Florence
dc.contributor.author Zárate, Marcelo Arístides
dc.date.available 2018-05-03T17:28:18Z
dc.date.issued 2016-08
dc.identifier.citation Cordoba, Francisco Elizalde; Piovano, Eduardo Luis; Guerra, Lucía; Mulsow, Sandor; Sylvestre, Florence; et al.; Independent time markers validate Pb-210 chronologies for two shallow Argentine lakes in Southern Pampas; Pergamon-Elsevier Science Ltd; Quaternary International; 438; 8-2016; 175-186
dc.identifier.issn 1040-6182
dc.identifier.uri http://hdl.handle.net/11336/43995
dc.description.abstract We report here the results of detailed Pb-210 analysis from two lake sediment cores collected from Lagunas Encadenadas del Oeste (LEO), located in the southern Argentinean Pampas (37°S, 62°W). Non-exponential and non-monotonic 210Pbuns depth-profiles in the sedimentary record of these shallow lacustrine systems indicate the interaction of complex processes behind radionuclide fluxes and lake sedimentation. The chronologies and sediment accumulation rates (SAR) for the lake sediment sequences were modeled using different 210Pb-based mathematical models. Since modeled 210Pb ages must be validated against independent stratigraphic markers of known age, two chrono-stratigraphic markers were selected to control the upper and lowermost parts of the 210Pb dated sediments. The younger stratigraphic marker of AD 1980 ± 2 corresponds to an uppermost organic carbon-rich mud accumulated by 1977-78 matching the most noticeable lake highstand occurred during the 20th century, registered on instrumental and paleolimnological records across the Pampean Plains. The oldest stratigraphic marker corresponds to AD 1878 ± 10 matching with a high lake productivity and wet phase related to anomalously intense rainfall and flooding events in southeastern South America for AD 1877?1878. When comparing the resulting ages to the stratigraphic markers, our results show that CRS-model (constant rate of supply) performs better than the other models. Thus, these independent chronostratigraphic markers used along the sedimentary records were critical to validate 210Pb-derived ages and therefore to select the most appropriate model to establish the chronological framework of the recent sediments of the LEO system. The CRS-model appears to be an adequate technique for deriving ages and SAR in the LEO sedimentary record and other Pampean lacustrine systems under strong hydrological variability.
dc.format application/pdf
dc.language.iso eng
dc.publisher Pergamon-Elsevier Science Ltd
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject LAKE SEDIMENT CHRONOLOGY
dc.subject 210PB RADIOMETRIC DATING
dc.subject 210PB MATHEMATICAL MODELS
dc.subject SEDIMENT ACCUMULATION RATE
dc.subject CONSTANT RATE OF 210PB SUPPLY MODEL
dc.subject ARGENTINEAN PAMPAS
dc.subject.classification Meteorología y Ciencias Atmosféricas
dc.subject.classification Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title Independent time markers validate Pb-210 chronologies for two shallow Argentine lakes in Southern Pampas
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2018-05-02T17:39:22Z
dc.journal.volume 438
dc.journal.pagination 175-186
dc.journal.pais Estados Unidos
dc.description.fil Fil: Cordoba, Francisco Elizalde. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones y Transferencia de Jujuy. Universidad Nacional de Jujuy. Centro de Investigaciones y Transferencia de Jujuy; Argentina
dc.description.fil Fil: Piovano, Eduardo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina
dc.description.fil Fil: Guerra, Lucía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina
dc.description.fil Fil: Mulsow, Sandor. Universidad Austral de Chile; Chile
dc.description.fil Fil: Sylvestre, Florence. Centre National de la Recherche Scientifique; Francia
dc.description.fil Fil: Zárate, Marcelo Arístides. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; Argentina
dc.journal.title Quaternary International
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S1040618215302172
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.quaint.2016.07.003
dc.conicet.fuente individual


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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)