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Earlier work in northeast Greenland has suggested a limited advance of the Greenland Ice Sheet during the Last Glacial Maximum (LGM). However, this concept has recently been challenged by marine geological studies, indicating grounded ice on the continental shelf at this time. New 10Be-ages from the Store Koldewey island, northeast Greenland, suggest that unscoured mountain plateaus at the outer coast were covered at least partly by cold-based ice during the LGM. It is, however, still inconclusive whether this ice was dynamically connected to the Greenland Ice Sheet or not.

Regardless of the LGM ice sheet extent, the 10Be results from Store Koldewey add to a growing body of evidence suggesting considerable antiquity of crystalline unscoured terrain near present and Pleistocene ice sheet margins.

Keywords: Greenland; blockfields; cosmogenic exposure dating

Document Type: Research Article


Affiliations: 1: Institute of Geological Sciences, University of Bern, Switzerland 2: Institute of Isotope Geochemistry and Mineral Resources ETH Zürich, Switzerland 3: Institute of Particle Physics, ETH Zürich, 8092 Zürich, Switzerland 4: Paul Scherrer Institut c/o Institute of Particle Physics, ETH Zürich, Switzerland 5: Department of Geology, Quaternary Sciences, Lund, Sweden

Publication date: 2007-09-01

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