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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

Blard, Pierre-Henri and Lave, Jérôme and Farley, Kenneth A. and Ramirez, Victor and Jimenez, Nestor and Martin, Léo C. P. and Charreau, Julien and Tibari, Bouchaїb and Fornari, Michel (2014) Progressive glacial retreat in the Southern Altiplano (Uturuncu volcano, 22°S) between 65 and 14 ka constrained by cosmogenic ^3He dating. Quaternary Research, 82 (1). pp. 209-221. ISSN 0033-5894. https://resolver.caltech.edu/CaltechAUTHORS:20140814-092609399

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://www.sciencedirect.com/science/article/pii/S0033589414000209PublisherArticle
http://dx.doi.org/10.1016/j.yqres.2014.02.002DOIArticle
ORCID:
AuthorORCID
Farley, Kenneth A.0000-0002-7846-7546
Alternate Title:Progressive glacial retreat in the Southern Altiplano (Uturuncu volcano, 22°S) between 65 and 14 ka constrained by cosmogenic 3He dating
Additional Information:© 2014 University of Washington. Published by Elsevier Inc. Received 2 July 2013, Available online 20 March 2014. This work was mainly funded by the INSU programs Relief de la Terre and EVE-LEFE and by the ANR Jeune Chercheur GALAC project “ANR-11-JS56-011-01”. We greatly appreciated the logistical support of the IRD of La Paz (Bolivia) during our field trip of September 2006. The SARM technicians and engineers are kindly acknowledged for their high-quality measurements of major and trace elements of rock samples. Two anonymous reviewers and associate editor David Fink made useful comments that allowed us to improve the article. This is CRPG contribution no. 2285.
Funders:
Funding AgencyGrant Number
INSU Program Relief de la TerreUNSPECIFIED
EVE-LEFEUNSPECIFIED
ANR Jeune Chercheur GALACANR-11-JS56-011-01
Subject Keywords:Altiplano; Uturuncu; Glaciations; Moraines; Cosmogenic 3He; Equilibrium line altitude; Local last glacial maximum; Lake Tauca
Other Numbering System:
Other Numbering System NameOther Numbering System ID
CRPG2285
Issue or Number:1
Record Number:CaltechAUTHORS:20140814-092609399
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140814-092609399
Official Citation:Pierre-Henri Blard, Jérôme Lave, Kenneth A. Farley, Victor Ramirez, Nestor Jimenez, Léo C.P. Martin, Julien Charreau, Bouchaïb Tibari, Michel Fornari, Progressive glacial retreat in the Southern Altiplano (Uturuncu volcano, 22°S) between 65 and 14 ka constrained by cosmogenic 3He dating, Quaternary Research, Volume 82, Issue 1, July 2014, Pages 209-221, ISSN 0033-5894, http://dx.doi.org/10.1016/j.yqres.2014.02.002. (http://www.sciencedirect.com/science/article/pii/S0033589414000209)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48549
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:14 Aug 2014 17:36
Last Modified:03 Mar 2020 13:01

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