T51 Looking to the Past to Understand the Future: Glacial Chronology and Process

Sunday, 22 October 2017
1:30 PM - 5:30 PM
Chelan 2

OCEAN-ATMOSPHERIC FORCING OF LATE GLACIAL AND HOLOCENE GLACIER FLUCTUATIONS IN THE EASTERN AND WESTERN CORDILLERA OF THE TROPICAL PERUVIAN ANDES

Paper number: T51-11
Program: Technical Sessions
Time: 4:05 PM – 4:20 PM

Authors

Abstract

Terrestrial cosmogenic nuclide (TCN) ages on moraine boulders combined with 14C-dated clastic sediment records from alpine lakes document glacial variability in the Eastern and Western Cordillera of Peru during the last ca. 16 ka. Late Glacial ice extents culminated at the start of the Antarctic Cold Reversal (ACR) and began retracting prior to the Younger Dryas (YD). Multiple moraine crests dating to the early Holocene mark brief readvances or stillstands that punctuated overall retreat of valley glacier termini during this interval. Glaciers were less extensive during the middle Holocene before experience a complex pattern of glacial variability during the latest Holocene. These records suggest that tropical Atlantic and Pacific ocean-atmospheric processes exerted temporally variable forcing of Late Glacial and Holocene glacial changes in the Peruvian Andes.

Geological Society of America Abstracts with Programs. Vol. 49, No. 6

doi: 10.1130/abs/2017AM-299487

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