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Progressive glacial retreat in the Southern Altiplano (Uturuncu volcano, 22°S) between 65 and 14 ka constrained by cosmogenic 3He dating

Published online by Cambridge University Press:  20 January 2017

Pierre-Henri Blard
Affiliation:
CRPG, UMR7358, CNRS, Université de Lorraine, Vandoeuvre les Nancy, France
Jérôme Lave
Affiliation:
CRPG, UMR7358, CNRS, Université de Lorraine, Vandoeuvre les Nancy, France
Kenneth A. Farley
Affiliation:
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
Victor Ramirez
Affiliation:
Universidad Mayor de San Andrés, La Paz, Bolivia
Nestor Jimenez
Affiliation:
Universidad Mayor de San Andrés, La Paz, Bolivia
Léo C.P. Martin
Affiliation:
CRPG, UMR7358, CNRS, Université de Lorraine, Vandoeuvre les Nancy, France
Julien Charreau
Affiliation:
CRPG, UMR7358, CNRS, Université de Lorraine, Vandoeuvre les Nancy, France
Bouchaïb Tibari
Affiliation:
CRPG, UMR7358, CNRS, Université de Lorraine, Vandoeuvre les Nancy, France
Michel Fornari
Affiliation:
IRD, Université de Nice, France
Corresponding
E-mail address:

Abstract

This work presents the first reconstruction of late Pleistocene glacier fluctuations on Uturuncu volcano, in the Southern Tropical Andes. Cosmogenic 3He dating of glacial landforms provides constraints on ancient glacier position between 65 and 14 ka. Despite important scatter in the exposure ages on the oldest moraines, probably resulting from pre-exposure, these 3He data constrain the timing of the moraine deposits and subsequent glacier recessions: the Uturuncu glacier may have reached its maximum extent much before the global LGM, maybe as early as 65 ka, with an equilibrium line altitude (ELA) at 5280 m. Then, the glacier remained close to its maximum position, with a main stillstand identified around 40 ka, and another one between 35 and 17 ka, followed by a limited recession at 17 ka. Then, another glacial stillstand is identified upstream during the late glacial period, probably between 16 and 14 ka, with an ELA standing at 5350 m. This stillstand is synchronous with the paleolake Tauca highstand. This result indicates that this regionally wet and cold episode, during the Heinrich 1 event, also impacted the Southern Altiplano. The ELA rose above 5450 m after 14 ka, synchronously with the Bolling–Allerod.

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Progressive glacial retreat in the Southern Altiplano (Uturuncu volcano, 22°S) between 65 and 14 ka constrained by cosmogenic 3He dating
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Progressive glacial retreat in the Southern Altiplano (Uturuncu volcano, 22°S) between 65 and 14 ka constrained by cosmogenic 3He dating
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