Minimum 10Be exposure ages of early Pliocene for the Table Mountain plateau and the Sirius Group at Mount Fleming, Dry Valleys, Antarctica

Research Article| November 01, 1995 Minimum 10Be exposure ages of early Pliocene for the Table Mountain plateau and the Sirius Group at Mount Fleming, Dry Valleys, Antarctica Susan Ivy-Ochs; Susan Ivy-Ochs 1Institut für Teilchenphysik and Ingenieurgeologie, ETH Hönggerberg, CH-8093 Zürich, Switzerland Search for other works by this author on: GSW Google Scholar Christian Schlüchter; Christian Schlüchter 2Geologisches Institut, Universität Bern, CH-3012 Bern, Switzerland Search for other works by this author on: GSW Google Scholar Peter W. Kubik; Peter W. Kubik 3Paul Scherrer Institut, c/o Institut für Teilchenphysik, ETH Hönggerberg, CH-8093 Zürich, Switzerland Search for other works by this author on: GSW Google Scholar Beate Dittrich-Hannen; Beate Dittrich-Hannen 1Institut für Teilchenphysik and Ingenieurgeologie, ETH Hönggerberg, CH-8093 Zürich, Switzerland Search for other works by this author on: GSW Google Scholar Jürg Beer Jürg Beer 4EAWAG, CH-8600 Dübendorf, Switzerland Search for other works by this author on: GSW Google Scholar Author and Article Information Susan Ivy-Ochs 1Institut für Teilchenphysik and Ingenieurgeologie, ETH Hönggerberg, CH-8093 Zürich, Switzerland Christian Schlüchter 2Geologisches Institut, Universität Bern, CH-3012 Bern, Switzerland Peter W. Kubik 3Paul Scherrer Institut, c/o Institut für Teilchenphysik, ETH Hönggerberg, CH-8093 Zürich, Switzerland Beate Dittrich-Hannen 1Institut für Teilchenphysik and Ingenieurgeologie, ETH Hönggerberg, CH-8093 Zürich, Switzerland Jürg Beer 4EAWAG, CH-8600 Dübendorf, Switzerland Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1995) 23 (11): 1007–1010. https://doi.org/10.1130/0091-7613(1995)023<1007:MBEAOE>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Susan Ivy-Ochs, Christian Schlüchter, Peter W. Kubik, Beate Dittrich-Hannen, Jürg Beer; Minimum 10Be exposure ages of early Pliocene for the Table Mountain plateau and the Sirius Group at Mount Fleming, Dry Valleys, Antarctica. Geology 1995;; 23 (11): 1007–1010. doi: https://doi.org/10.1130/0091-7613(1995)023<1007:MBEAOE>2.3.CO;2 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 Using accelerator mass spectrometry (AMS), we have measured 10Be and 26Al in quartz from granites and sandstones from Table Mountain and Mount Fleming, Antarctica. Our data show that the plateau surface at Table Mountain had formed by early Pliocene time at the latest. Granites fringing but within the Sirius Group at Table Mountain give a minimum exposure age of 2.6 Ma for this deposit. A sandstone clast on the Ferrar dolerite surface just outside and below, and thus postdating, the Sirius Group has a minimum age of 2.9 Ma. Two samples from the Sirius Group at Mount Fleming have 10Be concentrations that have reached secular equilibrium. This deposit is at least 4.8 m.y. old. The Sirius Group at Mount Fleming cannot have been deposited after 3.0–2.5 Ma, as implied by biostratigraphic data. Our dates contradict the hypothesis that in the Pliocene East Antarctica was deglaciated and the climate was significantly warmer and wetter. The preservation of these surfaces indicates a continuous cold desert in the dry valleys since the beginning of the Pliocene. The high 10Be concentrations we have measured cannot be reconciled with uplift of the Transantarctic Mountains at a rate of 1 km/m.y. during the past 3 m.y. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.