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Late glacial paleoclimate of the central Altiplano constrained by cosmogenic ^3He dating and 'clumped-isotope' paleothermometry

Blard, P.-H. and Lavé, J. and Farley, K. A. and Tripati, A. and Eiler, J. M. and Sylvestre, F. and Fornari, M. (2008) Late glacial paleoclimate of the central Altiplano constrained by cosmogenic ^3He dating and 'clumped-isotope' paleothermometry. Geochimica et Cosmochimica Acta, 72 (12). A89. ISSN 0016-7037. https://resolver.caltech.edu/CaltechAUTHORS:20130724-103129058

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Abstract

The timing and causes of the last deglaciation in the tropical Andes are still poorly constrained. Moreover, the paleoclimatic conditions that existed in this region during the paleolake Tauca highstand between 17 and 15 ka [1, 2] are still uncertain. Here we present new cosmogenic ^3He ages from glacial landforms of Cerro Tunupa (20°S) showing that, in the central part of the Altiplano, glaciers persisted at their maximum position between 17 and 15 ka, and retreated synchronously with the drop of the paleolake Tauca highstand after 15 ka. This result is different from previous moraine dating [3] that indicates an earlier (~34 ka) local glacial maximum in the northern part of Altiplano. This discrepancy most likely reflects spatial variability of past precipitation. Indeed, the extent of mountain glaciers is determined both by temperatures and local precipitation.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.gca.2008.05.005DOIArticle
http://www.sciencedirect.com/science/article/pii/S0016703708002603PublisherArticle
ORCID:
AuthorORCID
Farley, K. A.0000-0002-7846-7546
Additional Information:© 2008 Published by Elsevier Ltd.
Issue or Number:12
Record Number:CaltechAUTHORS:20130724-103129058
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130724-103129058
Official Citation:Goldschmidt Abstracts 2008- B, Geochimica et Cosmochimica Acta, Volume 72, Issue 12, Supplement, July 2008, Pages A41-A126, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2008.05.005.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39555
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Aug 2013 19:16
Last Modified:03 Mar 2020 13:01

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