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Holocene glacier history of northeastern Cordillera Darwin, southernmost South America (55°S)

Published online by Cambridge University Press:  16 August 2021

Scott A. Reynhout Open the ORCID record for Scott A. Reynhout [Opens in a new window] ,
Michael R. Kaplan ,
Esteban A. Sagredo ,
Juan Carlos Aravena ,
Rodrigo L. Soteres ,
Roseanne Schwartz  and
Joerg M. Schaefer
Scott A. Reynhout
Affiliation:
Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, 8370450Santiago, Chile Núcleo Milenio Paleoclima, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Chile
Michael R. Kaplan
Affiliation:
Lamont-Doherty Earth Observatory, Palisades, New York10964-100, USA
Esteban A. Sagredo*
Affiliation:
Núcleo Milenio Paleoclima, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Chile Instituto de Geografía, Pontificia Universidad Católica de Chile, 7820436Macul, Chile Estación Patagonia de Investigaciones Interdisciplinarias UC, Pontificia Universidad Católica de Chile, 7820436Macul, Chile
Juan Carlos Aravena
Affiliation:
Centro de Investigación Gaia Antártica, Universidad de Magallanes, 6200000Punta Arenas, Chile
Rodrigo L. Soteres
Affiliation:
Núcleo Milenio Paleoclima, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Chile Instituto de Geografía, Pontificia Universidad Católica de Chile, 7820436Macul, Chile
Roseanne Schwartz
Affiliation:
Lamont-Doherty Earth Observatory, Palisades, New York10964-100, USA
Joerg M. Schaefer
Affiliation:
Lamont-Doherty Earth Observatory, Palisades, New York10964-100, USA Department of Earth and Environmental Sciences of Columbia University, New York, New York10027, USA
*
*Corresponding author e-mail address:esagredo@uc.cl
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Abstract

In the Cordillera Darwin, southernmost South America, we used 10Be and 14C dating, dendrochronology, and historical observations to reconstruct the glacial history of the Dalla Vedova valley from deglacial time to the present. After deglacial recession into northeastern Darwin and Dalla Vedova, by ~16 ka, evidence indicates a glacial advance at ~13 ka coeval with the Antarctic Cold Reversal. The next robustly dated glacial expansion occurred at 870 ± 60 calendar yr ago (approximately AD 1150), followed by less-extensive dendrochronologically constrained advances from shortly before AD 1836 to the mid-twentieth century. Our record is consistent with most studies within the Cordillera Darwin that show that the Holocene glacial maximum occurred during the last millennium. This pattern contrasts with the extensive early- and mid-Holocene glacier expansions farther north in Patagonia; furthermore, an advance at 870 ± 60 yr ago may suggest out-of-phase glacial advances occurred within the Cordillera Darwin relative to Patagonia. We speculate that a southward shift of westerlies and associated climate regimes toward the southernmost tip of the continent, about 900–800 yr ago, provides a mechanism by which some glaciers advanced in the Cordillera Darwin during what is generally considered a warm and dry period to the north in Patagonia.

Keywords

glacierHolocenepaleoclimatewesterliesPatagoniaTierra del FuegoCordillera Darwin
Type
Research Article
Information
Quaternary Research , Volume 105 , January 2022 , pp. 166 - 181
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Copyright © University of Washington. Published by Cambridge University Press, 2021

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