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Title:
Abrupt glacial valley incision at 0.8 Ma dated from cave deposits in Switzerland
Authors:
Haeuselmann, Philipp; Granger, Darryl E.; Jeannin, Pierre-Yves; Lauritzen, Stein-Erik
Publication:
Geology, vol. 35, Issue 2, p.143
Publication Date:
02/2007
Origin:
ADS
DOI:
10.1130/G23094A
Bibliographic Code:
2007Geo....35..143H

Abstract

Glacial erosion dramatically alters mountain landscapes, but the pace at which glaciers carve a previously fluvial landscape remains poorly defined because long-term valley incision rates are difficult to measure. Here we reconstruct the lowering history of the Aare Valley, Switzerland, over the past 4 m.y. by dating cave sediments with cosmogenic 26Al and 10Be. Incision accelerated from ˜120 m/m.y. to ˜1200 m/m.y. at 0.8 1.0 Ma, at least 1 m.y. after the onset of local glaciation. Rapid incision may have been triggered by lowering of the equilibrium line altitude at the mid-Pleistocene climate transition.
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