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        Late- Pleistocene Wedge Structures Along The Patagonian Coast (Argentina): Chronological Constraints And Palaeo-Environmental Implications

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        http://digital.cic.gba.gob.ar/handle/11746/5956
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        http://repositorioslatinoamericanos.uchile.cl/handle/2250/2865243
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        Author
        Ribolini, Adriano
        Bini, Monica
        Consoloni, Ilaria
        Isola, Ilaria
        Pappalardo, Marta
        Zanchetta, Giovanni
        Fucks, Enrique
        Panzeri, Laura
        Martini, Marco
        Terrasi, Filippo
        Institutions
        • Comisión de Investigaciones Científicas (Argentina)
        Abstract
        This paper investigates several wedge structures formed in continental deposits covering marine sediments deposited during MIS 5 along the central Patagonian coast of Argentina. The size and surface microtexture characteristics of the infilling sediments are consistent with a depositional environment dominated by aeolian transport. Fragments of Andean volcanic rocks (glass shards) in the wedge-fill suggest long-distance transport via a westerly component of wind direction. The wedges are interpreted as products of deep seasonal frost action in frozen ground, which produced open cracks that filled rapidly with partially non-local aeolian sediments. Many wedges cross cut carbonate crusts that formed under permafrost conditions in coastal Patagonia. The radiocarbon dating of carbonate crusts yielded an age of 25–27 kyrbp, while wedge-fill sediments are OSL dated to 14 670 ± 750 yrbp. This indicates that ground wedge formation occurred during a cold event (the Antarctic Cold Reversal period) that interrupted the permafrost degradation following the Last Glacial Maximum.
        Subjects
        Geología

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        Red de Repositorios Latinoamericanos
        + of 2.515.000
        Available publications
        163 Participating institutions
        Dirección de Servicios de Información y Bibliotecas (SISIB)
        Universidad de Chile
        Membership Login
        Featured collections
        • Latin American Theses
        • Argentinean Theses
        • Chilean Theses
        • Peruvian Theses
        Latest collections added
        • Argentina
        • Brazil
        • Colombia
        • México
        Dirección de Servicios de Información y Bibliotecas (SISIB)
        Universidad de Chile
        Red de Repositorios Latinoamericanos | 2006-2018