Cosmogenic nuclides 10Be and 26Al imply limited Antarctic Ice Sheet thickening and low erosion in the Shackleton Range for >1 m.y.

Research Article| March 01, 2004 Cosmogenic nuclides 10Be and 26Al imply limited Antarctic Ice Sheet thickening and low erosion in the Shackleton Range for >1 m.y. C.J. Fogwill; C.J. Fogwill 1Institute of Geography, School of GeoSciences, University of Edinburgh, Edinburgh EH8 9XP, UK Search for other works by this author on: GSW Google Scholar M.J. Bentley; M.J. Bentley 2Department of Geography, University of Durham, Durham DH1 3LE, UK Search for other works by this author on: GSW Google Scholar D.E. Sugden; D.E. Sugden 3 Institute of Geography, School of GeoSciences, University of Edinburgh, Edinburgh EH8 9XP, UK Search for other works by this author on: GSW Google Scholar A.R. Kerr; A.R. Kerr 3 Institute of Geography, School of GeoSciences, University of Edinburgh, Edinburgh EH8 9XP, UK Search for other works by this author on: GSW Google Scholar P.W. Kubik P.W. Kubik 4Paul Scherrer Institute, c/o Institute of Particle Physics, ETH Hönggerberg, CH-8093 Zurich, Switzerland Search for other works by this author on: GSW Google Scholar Geology (2004) 32 (3): 265–268. https://doi.org/10.1130/G19795.1 Article history received: 03 May 2003 rev-recd: 24 Nov 2003 accepted: 25 Nov 2003 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 C.J. Fogwill, M.J. Bentley, D.E. Sugden, A.R. Kerr, P.W. Kubik; Cosmogenic nuclides 10Be and 26Al imply limited Antarctic Ice Sheet thickening and low erosion in the Shackleton Range for >1 m.y.. Geology 2004;; 32 (3): 265–268. doi: https://doi.org/10.1130/G19795.1 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 Concentrations of the cosmogenic nuclides 10Be and 26Al on bedrock surfaces in the Shackleton Range, Antarctica, indicate minimum exposure ages between 3.0 ± 0.3 and 1.16 ± 0.10 Ma. The isotope data indicate that the maximum long-term erosion rate is 0.10–0.35 m/m.y., and the ratios suggest no prolonged periods of burial by cold-based ice. The findings are important because of the location of the massif close to the junction of the East Antarctic Ice Sheet and the landward extent of the Filchner Ice Shelf. These results point to three conclusions. First, the massif has not been overridden by the East Antarctic Ice Sheet during the late Quaternary. Rather, moraines 200–340 m above outlet glaciers are likely to represent the maximum thickening of the Filchner-Ronne Ice Shelf during the Quaternary. Second, the high radionuclide concentrations on bedrock surfaces, one of which is striated, suggest that some glacial landforms were created in at least Pliocene or more likely Miocene time. Third, the exceptionally low erosion rates imply that the modern cold, arid climate has persisted for millions of years. These findings provide evidence of old, stable landscapes over a wider area of Antarctica than the McMurdo Dry Valleys. 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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