Quaternary erosion and cosmic-ray-exposure history derived from 10Be and 26Al produced in situ—An example from Pajarito plateau, Valles caldera region

Abstract

Research Article| June 01, 1993 Quaternary erosion and cosmic-ray-exposure history derived from 10Be and 26Al produced in situ—An example from Pajarito plateau, Valles caldera region Achim Albrecht; Achim Albrecht 1Department of Chemistry, Rutgers University, New Brunswick, New Jersey 08903 Search for other works by this author on: GSW Google Scholar Gregory F. Herzog; Gregory F. Herzog 1Department of Chemistry, Rutgers University, New Brunswick, New Jersey 08903 Search for other works by this author on: GSW Google Scholar Jeffrey Klein; Jeffrey Klein 2Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104 Search for other works by this author on: GSW Google Scholar Bijan Dezfouly-Arjomandy; Bijan Dezfouly-Arjomandy 2Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104 Search for other works by this author on: GSW Google Scholar Fraser Goff Fraser Goff 3Los Alamos National Laboratory, EES-1, Los Alamos, New Mexico 87545 Search for other works by this author on: GSW Google Scholar Author and Article Information Achim Albrecht 1Department of Chemistry, Rutgers University, New Brunswick, New Jersey 08903 Gregory F. Herzog 1Department of Chemistry, Rutgers University, New Brunswick, New Jersey 08903 Jeffrey Klein 2Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104 Bijan Dezfouly-Arjomandy 2Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104 Fraser Goff 3Los Alamos National Laboratory, EES-1, Los Alamos, New Mexico 87545 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1993) 21 (6): 551–554. https://doi.org/10.1130/0091-7613(1993)021<0551:QEACRE>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 Achim Albrecht, Gregory F. Herzog, Jeffrey Klein, Bijan Dezfouly-Arjomandy, Fraser Goff; Quaternary erosion and cosmic-ray-exposure history derived from 10Be and 26Al produced in situ—An example from Pajarito plateau, Valles caldera region. Geology 1993;; 21 (6): 551–554. doi: https://doi.org/10.1130/0091-7613(1993)021<0551:QEACRE>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 10Be and 26Al concentrations measured by accelerator mass spectrometry in 20 samples of quartz separated from rhyolitic volcanic ash-flow tuffs collected on the Pajarito plateau of the Valles caldera, New Mexico, were used to model time-integrated erosion rates and cosmic ray-exposure histories. The model erosion rates determined for different stratigraphic units within the Tshirege member, upper Bandelier Tuff, vary from 0.1 cm/ka for the resistant unit to 1.1 cm/ka for the softer unit. Intermediate erosion rates are thought to indicate earlier age cover by post-tuff lithologies of different hardness. The geographic distribution of these intermediate rates allows an approximate determination of the extent of material now gone (stratigraphic ghosts). Periods of burial can be determined from 26Al/10Be ratios. For the Pajarito plateau, burial most likely resulted from cover by soil and sediment held in place by vegetation. Our data allow us to model the duration and extent of thick forest cover, which today exists only at higher altitudes. This content is PDF only. Please click on the PDF icon to access. 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.