Late Quaternary glacial chronology on Nevado Illimani, Bolivia, and the implications for paleoclimatic reconstructions across the Andes

10Be terrestrial cosmogenic nuclide surface exposure ages from moraines on Nevado Illimani, Cordillera Real, Bolivia suggest that glaciers retreated from moraines during the periods 15.5–13.0 ka, 10.0–8.5 ka, and 3.5–2.0 ka. Late glacial moraines at Illimani are associated with an ELA depression of...

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Bibliographic Details
Published in:Quaternary research 2011-01, Vol.75 (1), p.1-10
Main Authors: Smith, Colby A., Lowell, Thomas V., Owen, Lewis A., Caffee, Marc W.
Format: Article
Language:English
Subjects:
Bolivia
Chronology
Cordillera Real
Depression
Equilibrium line altitude
Flattening
Glacial chronology
Glacial geology
Glacial periods
Nevado Illimani
Nuclides
Precipitation
Reconstruction
Tropical Andes
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Summary:10Be terrestrial cosmogenic nuclide surface exposure ages from moraines on Nevado Illimani, Cordillera Real, Bolivia suggest that glaciers retreated from moraines during the periods 15.5–13.0 ka, 10.0–8.5 ka, and 3.5–2.0 ka. Late glacial moraines at Illimani are associated with an ELA depression of 400–600 m, which is consistent with other local reconstructions of late glacial ELAs in the Eastern Cordillera of the central Andes. A comparison of late glacial ELAs between the Eastern Cordillera and Western Cordillera indicates a marked change toward flattening of the east-to-west regional ELA gradient. This flattening is consistent with increased precipitation from the Pacific during the late glacial period.
ISSN:0033-5894
1096-0287
DOI:10.1016/j.yqres.2010.07.001