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Early deglaciation and paleolake history of Río Cisnes Glacier, Patagonian Ice Sheet (44°S)

Published online by Cambridge University Press:  31 October 2018

Juan-Luis García ,
Antonio Maldonado ,
María Eugenia de Porras ,
Amalia Nuevo Delaunay ,
Omar Reyes ,
Claudia A. Ebensperger ,
Steven A. Binnie ,
Christopher Lüthgens  and
César Méndez
Juan-Luis García*
Affiliation:
Instituto de Geografía, Facultad de Historia, Geografía y Ciencia Política, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Macul, Santiago 782-0436, Chile
Antonio Maldonado
Affiliation:
Centro de Estudios Avanzados en Zonas Áridas, La Serena 1700000, Chile Instituto de Investigación Multidisciplinario en Ciencia y Tecnología, Universidad de La Serena 1700000, La Serena, Chile Departamento de Biología Marina, Universidad Católica del Norte, Larrondo 1281, Coquimbo 1781421, Chile
María Eugenia de Porras
Affiliation:
Centro de Estudios Avanzados en Zonas Áridas, La Serena 1700000, Chile Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA), CCT Mendoza CONICET, Av. Ruiz Leal s/n, Mendoza 5500, Argentina
Amalia Nuevo Delaunay
Affiliation:
Centro de Investigación en Ecosistemas de la Patagonia, Moraleda 16, Coyhaique 5951601, Chile
Omar Reyes
Affiliation:
Centro de Estudios del Hombre Austral, Universidad de Magallanes, Punta Arenas 6210427, Chile
Claudia A. Ebensperger
Affiliation:
Instituto de Geografía, Facultad de Historia, Geografía y Ciencia Política, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Macul, Santiago 782-0436, Chile
Steven A. Binnie
Affiliation:
Institut für Geologie und Mineralogie, Universität zu Köln, Zülpicher Str. 49b, 50674 Köln, Germany
Christopher Lüthgens
Affiliation:
Institute for Applied Geology, University of Natural Resources and Life Sciences (BOKU), Vienna 1190, Austria
César Méndez
Affiliation:
Centro de Investigación en Ecosistemas de la Patagonia, Moraleda 16, Coyhaique 5951601, Chile
*
*Corresponding author at: Instituto de Geografía, Facultad de Historia, Geografía y Ciencia Política, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Macul, Santiago 782-0436, Chile. E-mail address: jgarciab@uc.cl (J.-L. García).
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Abstract

The timing, structure, and landscape change during the Patagonian Ice Sheet deglaciation remains unresolved. In this article, we provide a geomorphic, stratigraphic, and geochronological deglacial record of Río Cisnes Glacier at 44°S and also from the nearby Río Ñirehuao and Río El Toqui valleys (45°S) in Chilean Patagonia. Our 14C, 10Be, and optically stimulated luminescence data indicate that after the last glacial maximum, Río Cisnes Glacier experienced ~100 km deglaciation between >19.0 and 12.3 ka, accompanied by the formation of large glacial paleolakes. Deglaciation was interrupted by several ice readvances, and by 16.9±0.3 ka, Río Cisnes Glacier extended only ~40% of its full glacial extent. The deglaciation of Río Cisnes Glacier and other sensitive Patagonian glaciers occurred at least 1 ka earlier than the ca. 17.8 ka normally assumed for the local termination, coincident with West Antarctic isotope records. This early deglaciation can be linked to an orbital forcing–driven decline of Southern Ocean sea ice associated with a distinct atmospheric warming that is apparent for West Antarctica through Patagonia.

Keywords

last terminationlast glacial-interglacial transitionlast deglaciationPatagonia, Patagonian ice sheetpaleolakesglacial geomorphology10Be datingOSL dating14C dating
Type
Research Article
Information
Quaternary Research , Volume 91 , Issue 1 , January 2019 , pp. 194 - 217
Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2018. 

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