40Ar/39Ar dating of Quaternary feldspar: Examples from the Taupo Volcanic Zone, New Zealand

Abstract

Research Article| June 01, 1992 40Ar/39Ar dating of Quaternary feldspar: Examples from the Taupo Volcanic Zone, New Zealand M. S. Pringle; M. S. Pringle 1U.S. Geological Survey, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar M. McWilliams; M. McWilliams 2Department of Geophysics, Stanford University, Stanford, California 94305-2215 Search for other works by this author on: GSW Google Scholar B. F. Houghton; B. F. Houghton 3Department of Scientific and Industrial Research, Geology and Geophysics, P.O. Box 499, Rotorua, New Zealand Search for other works by this author on: GSW Google Scholar M. A. Lanphere; M. A. Lanphere 1U.S. Geological Survey, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar C.J.N. Wilson C.J.N. Wilson 4Department of Earth Sciences, University of Cambridge, Cambridge CB3 0EZ, England Search for other works by this author on: GSW Google Scholar Author and Article Information M. S. Pringle 1U.S. Geological Survey, Menlo Park, California 94025 M. McWilliams 2Department of Geophysics, Stanford University, Stanford, California 94305-2215 B. F. Houghton 3Department of Scientific and Industrial Research, Geology and Geophysics, P.O. Box 499, Rotorua, New Zealand M. A. Lanphere 1U.S. Geological Survey, Menlo Park, California 94025 C.J.N. Wilson 4Department of Earth Sciences, University of Cambridge, Cambridge CB3 0EZ, England Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1992) 20 (6): 531–534. https://doi.org/10.1130/0091-7613(1992)020<0531:AADOQF>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 MailTo Tools Icon Tools Get Permissions Search Site Citation M. S. Pringle, M. McWilliams, B. F. Houghton, M. A. Lanphere, C.J.N. Wilson; 40Ar/39Ar dating of Quaternary feldspar: Examples from the Taupo Volcanic Zone, New Zealand. Geology 1992;; 20 (6): 531–534. doi: https://doi.org/10.1130/0091-7613(1992)020<0531:AADOQF>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 a continuous laser and resistance furnace, we have measured ages on Quaternary plagioclase with an absolute precision of about ±30 ka and on Quaternary sanidine with a relative precision of better than 1%. Such precision was achieved by using low-temperature heating steps to remove much of the nonradiogenic argon contamination. Plagioclase is one of the most common mineral phases in volcanic rocks; thus, these procedures will be widely applicable to many problems for which precise radiometric age control has not been available. We studied plagioclase and plagioclase-sanidine concentrates from the oldest and the three largest silicic ash-flow deposits of the Taupo Volcanic Zone, New Zealand, one of the world's largest and most active volcanic systems. The results are in close agreement with new magnetostratigraphic data, suggest that existing fission-track age determinations significantly underestimate the age of older units, and shift the inception of Taupo Volcanic Zone volcanism back to at least 1600 ka. The improved precision has permitted the first correlations between proximal and distal units; previous correlations with deep-sea ash flows in the western Pacific require major revision. 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.