Can glacial erosion limit the extent of glaciation?

Simon M. Lax, Alun L. Hubbard, Andrew S. Hein, Michael R. Kaplan

Research output: Contribution to journalArticlepeer-review

70 Citations (SciVal)


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.
Original languageEnglish
Pages (from-to)172-179
Number of pages8
Issue number2
Publication statusPublished - 15 Jan 2008


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