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

Authors


C.J. Fogwill, Institute of Geography, School of GeoSciences, University of Edinburgh, Edinburgh, EH8 9XP, UK E-mail: fogwill@staffmail.ed.ac.uk

P.W. Kubik, Paul Scherrer Institute, c/o Institute of Particle Physics, ETH Hönggerberg, CH-8093, Zürich, Switzerland E-mail: kubik@phys.ethz.ch

Abstract

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.

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