A GLACIAL STAGE SPANNING THE ANTARCTIC COLD REVERSAL IN TORRES DEL PAINE (51°S), CHILE, BASED ON PRELIMINARY COSMOGENIC EXPOSURE AGES

Authors: FOGWILL, C.J.¹; KUBIK, P.W.²

Source: Geografiska Annaler: Series A, Physical Geography, Volume 87, Number 2, June 2005 , pp. 403-408(6)

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Abstract:

Initial cosmogenic ¹⁰Be results from a former ice limit in Torres del Paine indicate a shortlived stillstand or readvance of Patagonian ice culminating at 12–15 kyr BP with a mean age of 13.2 ± 0.8 kyr BP. The glacier extended some 40 km beyond the present ice margin and was within 15 km of the presumed Last Glacial Maximum limits. The timing of the glacier stage spans the cooling event recorded in Antarctic ice cores, termed the Antarctic Cold Reversal (14.5–12.9 kyr BP). This result implies that glaciers at these latitudes were out of phase with those in the northern hemisphere; instead they mirrored the climate structure of Antarctica during the last glacial to interglacial transition.

Keywords: Antarctic Cold Reversal; South America; Patagonia; Late Glacial; geomorphology; cosmogenic

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.0435-3676.2005.00266.x

Affiliations: 1: Institute of Geography, University of Edinburgh, Edinburgh, UK 2: Paul Scherrer Institute, ETH Hönggerberg, Zürich, Switzerland

Publication date: 2005-06-01