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Late Pleistocene deglaciation in the upper Gállego Valley, central Pyrenees

Published online by Cambridge University Press:  20 January 2017

David Palacios ,
Nuria de Andrés ,
Juan I. López-Moreno  and
José M. García-Ruiz
David Palacios*
Affiliation:
Department of Geography, Universidad Complutense de Madrid, 28.040 Madrid, Spain
Nuria de Andrés
Affiliation:
Department of Geography, Universidad Complutense de Madrid, 28.040 Madrid, Spain
Juan I. López-Moreno
Affiliation:
Instituto Pirenaico de Ecología, CSIC, Campus de Aula Dei, P.O. Box 13.034, 50.080 Zaragoza, Spain
José M. García-Ruiz
Affiliation:
Instituto Pirenaico de Ecología, CSIC, Campus de Aula Dei, P.O. Box 13.034, 50.080 Zaragoza, Spain
*
* Corresponding author.E-mail address:davidp@ucm.es (D. Palacios).
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Abstract

Deglaciation processes in the upper Gállego Valley, central–southern Pyrenees, were studied using geomorphological mapping and 36Cl cosmogenic dating of moraine and rock glacier boulders, as well as polished bedrock. Although the precise position of the Gállego Glacier during the global last glacial maximum is not known, there is evidence that ice tongues retreated to the headwaters, which caused subdivision of the main glacier into a number of individual glaciers prior to 17 ka. A range of ages (16 to 11 ka) was found among three tributary valleys within the general trend of deglaciation. The retreat rate to cirque was estimated to be relatively rapid (approximately 5 km per ka). The mapped glacial sedimentology and geomorphology appears to support the occurrence of multiple minor advances and retreats, or periods of stasis during the late deglaciation. Geomorphological and geological differences among the tributary valleys, and error estimates associated with the results obtained, prevented unambiguous correlations of the advances with the late Pleistocene cold periods. During the latter advances, small glaciers and rock glaciers developed close to the cirque headwalls, and co-occurred under the same climatic conditions. No evidence for Holocene re-advance was found for any of the three tributary valleys.

Keywords

DeglaciationCosmogenic datingOldest DryasBølling/AllerødYounger DryasCentral Pyrenees

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Type
Original Articles
Information
Quaternary Research , Volume 83 , Issue 3 , May 2015 , pp. 397 - 414
Copyright
University of Washington

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