Can glacial erosion limit the extent of glaciation?

Publication Type  Journal Article
Year of Publication  2009
Authors  Kaplan, M. R.; Hein, A. S.; Hubbard, A.; Lax, S. M.
Journal Title  Geomorphology
Volume  103
Issue  2
Pages  172-179
Journal Date  Jan 15
ISBN Number  0169-555X
Accession Number  ISI:000261726600003
Key Words  andes; glaciation; south america; glacial geomorphology; tectonics; erosion; cosmogenic nuclide chronology; cenozoic landscape evolution; southernmost south-america; surface exposure ages; lago buenos-aires; alpine-glaciation; transantarctic mountains; pa

In southern South America, the maximum areal extent of ice during the Quaternary Period, the Greatest Patagonian Glaciation (GPG, [Mercer, J.H., 1983. Cenozoic glaciation in the southern hemisphere. Annual Reviews of Earth and Planetary Science 11, 99-132.]), occurred at 1.1 Ma and subsequent glaciations were overall less extensive. The GPG preceded global minimum temperatures and maximal volume of ice, which occurred in the last similar to 800 kyr, as recorded in the marine delta O-18 record. Significant modification of the drainage morphology of the southern Andes from a non-glaciated to glaciated landscape occurred throughout the Quaternary Period. We infer a non-climatic relationship between glacial modification of the mountains and the decreasing extent of ice and we discuss processes of landscape development that could have caused the these include modification of valleys, such as development from a V- to a U-shape, and lowering of mass-accumulation areas. Such changes would strongly affect glacial dynamics, the mass balance profile and mass-flux during succeeding glaciations, especially for low-gradient outlet glaciers occupying low areas. Other areas around Earth (at least where ice has been warm-based) also may exhibit a non-random trend of decreasing extent of ice with time, ultimately because of glacial erosion in the Quaternary Period. (C) 2008 Elsevier B.V. All rights reserved.


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URL  <Go to ISI>://000261726600003
DOI  DOI 10.1016/j.geomorph.2008.04.020