Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 294, Issue 1-2, Pages 123-130Publisher
ELSEVIER
DOI: 10.1016/j.epsl.2010.03.019
Keywords
supraglacial; moraine; stagnation; glacier; avalanche; debris cover
Categories
Funding
- NSF [0424589, 053121]
- Gary Comer Science and Education Foundation
- Directorate For Geosciences
- Office of Polar Programs (OPP) [0424589] Funding Source: National Science Foundation
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New model results show that a glacier advance caused by deposition of a rock avalanche on the ice will be followed by stagnation of the advanced ice lobe, producing distributed, hummocky deposits quite different from the single moraine ridges typically dated in paleoclimatic reconstructions. We obtain these results using a numerical flow-line glacier model with superimposed rock debris. In particular, our results imply that the single moraine ridge known as the Waiho Loop of the Franz Josef Glacier, New Zealand, is not the result of an advance triggered by a rock avalanche, else there would be a widespread, hummocky, glacial stagnation deposit associated with it. (C) 2010 Elsevier B.V. All rights reserved.
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