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Authordc.contributor.authorLiu, Dawei 
Authordc.contributor.authorBertrand, Sebastien 
Authordc.contributor.authorVillaseñor, Tania 
Authordc.contributor.authorVan Dijck, Toon 
Authordc.contributor.authorFagel, Nathalie 
Authordc.contributor.authorMattielli, Nadine 
Admission datedc.date.accessioned2021-04-06T22:00:49Z
Available datedc.date.available2021-04-06T22:00:49Z
Publication datedc.date.issued2020
Cita de ítemdc.identifier.citationSedimentary Geology Volumen: 408 Número de artículo: 105744 Oct 2020es_ES
Identifierdc.identifier.other10.1016/j.sedgeo.2020.105744
Identifierdc.identifier.urihttps://repositorio.uchile.cl/handle/2250/178972
Abstractdc.description.abstractThe ability to trace and quantify sediment provenance in northwestern Patagonia is increasingly needed to properly understand modem sediment erosion and transport processes in this rapidly changing environment, and to accurately interpret sediment records from adjacent basins in terms of climate and environmental change. Nonetheless, no study so far has systematically evaluated the effectiveness of different tracers to reconstruct sediment provenance in this region. To fill this gap, we assess the effectiveness of commonly-used provenance indicators, including bulk mineralogy, major and rare earth element (REE) geochemistry, and Sr and Nd isotopes, to reconstruct sediment provenance in northwestern Patagonia. First, the ability of these tracers to discriminate between the main sources of sediment in the region is investigated, mostly using data compiled from the literature. Then, the potential of these tracers for provenance reconstruction is assessed by comparing the composition of sediments from six major Chilean rivers between 44 and 48 degrees S to lithological proportions in their respective watersheds. The results suggest that mineralogy, major element geochemistry, and REE geochemistry can be used as qualitative tracers of sediment provenance. However, the compositional overlap between the sources and the relatively large variability within them prevent quantitative reconstructions. By comparison, Sr-87/Sr-86 and epsilon Nd allow to clearly differentiate between the sources, most likely due to significant age differences between the main lithologies, and to estimate the relative contribution of each source. End-member mixing results based on Sr and Nd isotopes show that the relative source contributions are in general agreement with the lithological proportions in the river watersheds. Differences between estimated contributions and lithological proportions in the watersheds are interpreted as the result of the high regional precipitation gradient and unequal glacier distribution, which lead to variable erosion rates across the study area. Our results demonstrate the suitability of Sr-87/Sr-86 and epsilon Nd for quantitative provenance reconstruction in northwestern Patagonia. They constitute a strong basis for the interpretation of sediment archives from the Patagonian fjords and from the eastern South Pacific, and they should be particularly useful to quantitatively investigate modern and past earth-surface processes.es_ES
Patrocinadordc.description.sponsorshipUGent HYDROPROX project 01N02216 National Geographic Society 8379-07 FWO 1510411N Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT) CONICYT FONDECYT 3170611 China Scholarship Council Millennium Nucleus Paleoclimate - ANID Millennium Science Initiative NCN17_079es_ES
Lenguagedc.language.isoenes_ES
Publisherdc.publisherElsevieres_ES
Sourcedc.sourceSedimentary Geologyes_ES
Keywordsdc.subjectSediment provenancees_ES
Keywordsdc.subjectChilean Patagoniaes_ES
Keywordsdc.subjectSr isotopeses_ES
Keywordsdc.subjectNd Isotopeses_ES
Keywordsdc.subjectMineralogyes_ES
Keywordsdc.subjectInorganic geochemistryes_ES
Títulodc.titleProvenance of northwestern Patagonian river sediments (44-48 degrees S): A critical evaluation of mineralogical, geochemical and isotopic tracerses_ES
Document typedc.typeArtículo de revistaes_ES
dcterms.accessRightsdcterms.accessRightsAcceso a solo metadatoses_ES
Catalogueruchile.catalogadorcfres_ES
Indexationuchile.indexArtículo de publicación ISI
Indexationuchile.indexArtículo de publicación SCOPUS


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