A preliminary investigation of the timing of the local last glacial maximum and deglaciation on HualcaHualca volcano - Patapampa Altiplano (arid Central Andes, Peru)
Por:
Alcala-Reygosa, Jesus, Palacios, David, Vazquez-Selem, Lorenzo
Publicada:
20 ago 2017
Categoría:
Earth-surface processes
Resumen:
We studied the timing and area of the late Pleistocene maximum glacier
extent, the readvance or stillstand phases and the deglaciation
processes in the HualcaHualca volcano and Patapampa Altiplano, located
in the southern arid Peruvian Andes. We used geomorphological mapping
and 9 Cl-36 cosmogenic surface exposure dating of moraine boulders as
well as polished and striated bedrock surfaces. The cosmogenic exposure
ages indicates that the local Last Glacial Maximum occurred at 17-16 ka
on the HualcaHualca volcano. Moreover, the Patapampa Altiplano ice cap
had already disappeared by similar to 12 ka while glaciers on the
HualcaHualca also experienced a marked retreat at that time. However,
the low number of samples in the study area and the different
chronologies derived from the available production rates do not allow us
to provide a detailed glacial reconstruction. We recommend a more
intensive dating campaign and the development of a local production rate
for Cl-36 in the Central Andes. (C) 2017 Elsevier Ltd and INQUA. All
rights reserved.
Filiaciones:
Univ Nacl Autonoma Mexico, Fac Filosofia & Letras, Ciudad Univ, Mexico City 04510, DF, Mexico
Univ Complutense, Dept Geog, C Prof Aranguren S-N, E-28040 Madrid, Spain
Univ Nacl Autonoma Mexico, Inst Geog, Ciudad Univ, Mexico City 04510, DF, Mexico
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