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Reconstruction of a complex late Quaternary glacial landscape in the Cordillera de Cochabamba (Bolivia) based on a morphostratigraphic and multiple dating approach

Published online by Cambridge University Press:  20 January 2017

Jan-Hendrik May ,
Jana Zech ,
Roland Zech ,
Frank Preusser ,
Jaime Argollo ,
Peter W. Kubik  and
Heinz Veit
Jan-Hendrik May*
Affiliation:
School of Earth and Environmental Sciences, University of Wollongong, Wollongong 2522 NSW, Australia
Jana Zech
Affiliation:
Institute of Geography, University of Bern, Hallerstrasse 12, 3012 Bern, Switzerland
Roland Zech
Affiliation:
Geologisches Institut, ETH Zürich, Sonneggstrasse 5, 8092 Zürich, Switzerland
Frank Preusser
Affiliation:
Institute of Geological Sciences, University of Bern, Baltzerstrasse 1+3, 3012 Bern, Switzerland
Jaime Argollo
Affiliation:
Instituto de Investigaciones Geológicas y del Medioambiente, Universidad Mayor de San Andres, La Paz, Bolivia
Peter W. Kubik
Affiliation:
Laboratory of Ion Beam Physics, ETH Zürich, Schafmattstrasse 20, 8093 Zürich, Switzerland
Heinz Veit
Affiliation:
Institute of Geography, University of Bern, Hallerstrasse 12, 3012 Bern, Switzerland
*
⁎Corresponding author. E-mail address:[email protected] (J.-H. May).
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Abstract

Although glacial landscapes have previously been used for the reconstruction of late Quaternary glaciations in the Central Andes, only few data exist for the Eastern Cordillera in Bolivia. Here, we present results from detailed morphostratigraphic mapping and new data of surface exposure dating (SED), optically stimulated luminescence (OSL), and radiocarbon dating (14C) from the Huara Loma Valley, Cordillera de Cochabamba (Bolivia). Discrepancies between individual dating methods could be addressed within the context of a solid geomorphic framework. We identified two major glaciations. The older is not well constrained by the available data, whereas the younger glaciation is subdivided into at least four major glacial stages. Regarding the latter, a first advance dated to ~ 29–25 ka occurred roughly contemporaneous with the onset of the global last glacial maximum (LGM) and was followed by a less extensive (re-)advance around 20–18 ka. The local last glacial maximum (LLGM) in the Huara Loma Valley took place during the humid lateglacial ~17–16 ka, followed by several smaller readvances until ~10–11 ka, and complete deglaciation at the end of the Early Holocene.

Keywords

Central AndesBoliviaGlaciationMorphostratigraphyLateglacialLGM
Type
Research Article
Information
Quaternary Research , Volume 76 , Issue 1 , July 2011 , pp. 106 - 118
Copyright
University of Washington

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Footnotes

1 Present address: Department of Physical Geography and Quaternary Geology, Stockholm University, 106 91 Stockholm, Sweden.

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