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Rates of Quaternary Glacial Erosion and Corrie Formation, Marie Byrd Land, Antarctica

1973; Geological Society of America; Volume: 1; Issue: 2 Linguagem: Inglês

10.1130/0091-7613(1973)1 2.0.co;2

1943-2682

John T. Andrews, Wesley E. LeMasurier,

Methane Hydrates and Related Phenomena

Research Article| October 01, 1973 Rates of Quaternary Glacial Erosion and Corrie Formation, Marie Byrd Land, Antarctica J. T. Andrews; J. T. Andrews 1Institute of Arctic and Alpine Research and Department of Geological Sciences, University of Colorado, Boulder, Colorado 80302 Search for other works by this author on: GSW Google Scholar W. E. LeMasurier W. E. LeMasurier 2Division of Natural and Physical Sciences, University of Colorado at Denver, Denver, Colorado 80202 Search for other works by this author on: GSW Google Scholar Geology (1973) 1 (2): 75–80. https://doi.org/10.1130/0091-7613(1973)1 2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Search Site Citation J. T. Andrews, W. E. LeMasurier; Rates of Quaternary Glacial Erosion and Corrie Formation, Marie Byrd Land, Antarctica. Geology 1973;; 1 (2): 75–80. doi: https://doi.org/10.1130/0091-7613(1973)1 2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search nav search search input Search input auto suggest search filter All ContentBy SocietyGeology Search Advanced Search Abstract Three volcanoes composed of subice palagonite breccia form nunataks in Marie Byrd Land, Antarctica. They have been extensively modified by glacial erosion to give numerous large corries (cirques). Two of the volcanoes are radiometrically dated, which enables estimates to be made of the rate of erosion. The estimates are based on the computation of change in volume from a frustum of a cone. Rates of denudation of 360 to 460 mm per 1,000 yr are obtained, but differences in corrie size indicate that local headward erosion is ∼ 5,800 mm per 1,000 yr and lateral erosion is 800 mm per 1,000 yr. The rates apply to relatively incompetent rock. Subaerial flows of comparable age in the same region are not as intensively eroded. Erosion is probably caused by mechanical riving induced by the freezing of melt-water, which is in turn produced by local radiation conditions in the corries. Thus, glacial erosion seems to depend upon the existence of bedrock exposed above the ice sheet and the production of melt-water from the exposed rock. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.