Abstract

Research Article| September 01, 2006 Apatite (U-Th)/He signal of large-magnitude accelerated glacial erosion, southwest British Columbia Todd A. Ehlers; Todd A. Ehlers 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA Search for other works by this author on: GSW Google Scholar Kenneth A. Farley; Kenneth A. Farley 2Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA Search for other works by this author on: GSW Google Scholar Margaret E. Rusmore; Margaret E. Rusmore 3Department of Geology, Occidental College, Los Angeles, California 90041, USA Search for other works by this author on: GSW Google Scholar Glenn J. Woodsworth Glenn J. Woodsworth 4Geological Survey of Canada, 101-605 Robson St., Vancouver, British Columbia V6B 5J3, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Todd A. Ehlers 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA Kenneth A. Farley 2Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA Margaret E. Rusmore 3Department of Geology, Occidental College, Los Angeles, California 90041, USA Glenn J. Woodsworth 4Geological Survey of Canada, 101-605 Robson St., Vancouver, British Columbia V6B 5J3, Canada Publisher: Geological Society of America Received: 07 Dec 2005 Revision Received: 24 Apr 2006 Accepted: 01 May 2006 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2006) 34 (9): 765–768. https://doi.org/10.1130/G22507.1 Article history Received: 07 Dec 2005 Revision Received: 24 Apr 2006 Accepted: 01 May 2006 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Todd A. Ehlers, Kenneth A. Farley, Margaret E. Rusmore, Glenn J. Woodsworth; Apatite (U-Th)/He signal of large-magnitude accelerated glacial erosion, southwest British Columbia. Geology 2006;; 34 (9): 765–768. doi: https://doi.org/10.1130/G22507.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Alpine glaciers are efficient agents of erosion and capable of significantly modifying topography. Despite recent advances in theoretical and field studies that quantify glacial erosion processes, few studies have documented glacial erosion rates over long (>106 yr) or large (more than tens of kilometers) scales. We use apatite (U-Th)/He (AHe) and apatite fission track (AFT) cooling ages to address the late Miocene to Holocene erosion history across two 60-km-long transects of the heavily glaciated southern Coast Mountains, British Columbia. Observed AHe cooling ages from equal elevation samples range between 1.5 and 8 Ma and suggest that thick alpine glaciers resulted in a 16 km shift of the highest point in the topography in the past 1.5–4.0 m.y. We evaluated temporal and spatial variations in erosion rates using a three-dimensional thermal-kinematic model that predicted AHe and AFT ages at the surface for different erosion histories. Comparison of model predicted and observed cooling ages suggests an increase in erosion rates of as much as 300% over the past 1.5–7 m.y., coincident with the onset of glaciation of this range. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

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