Age of initial oceanic magmatism in the Late Proterozoic Arabian Shield

Abstract

Research Article| September 01, 1992 Age of initial oceanic magmatism in the Late Proterozoic Arabian Shield A. Kröner; A. Kröner 1Institut für Geowissenschaften, Universität Mainz, Postfach 3980, 6500 Mainz, Germany Search for other works by this author on: GSW Google Scholar J. S. Pallister; J. S. Pallister 2U.S. Geological Survey, Box 25046, Denver, Colorado 80225 Search for other works by this author on: GSW Google Scholar R. J. Fleck R. J. Fleck 3U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Author and Article Information A. Kröner 1Institut für Geowissenschaften, Universität Mainz, Postfach 3980, 6500 Mainz, Germany J. S. Pallister 2U.S. Geological Survey, Box 25046, Denver, Colorado 80225 R. J. Fleck 3U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 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 (9): 803–806. https://doi.org/10.1130/0091-7613(1992)020<0803:AOIOMI>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 A. Kröner, J. S. Pallister, R. J. Fleck; Age of initial oceanic magmatism in the Late Proterozoic Arabian Shield. Geology 1992;; 20 (9): 803–806. doi: https://doi.org/10.1130/0091-7613(1992)020<0803:AOIOMI>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 Lead isotopic data for zircons from a dacite clast in a volcanic breccia of the oldest oceanic assemblage (immature arc or oceanic plateau) of the southwestern Arabian Shield (Baish group), acquired with the single-grain evaporation technique, yielded a mean 207Pb/206Pb age of 842 ±17 Ma. Earlier published Rb-Sr data for Baish rocks yielded a three-point isochron of 1165 ±110 Ma. This age has been repeatedly cited as evidence for pre-1 Ga arc magmatism in the Arabian Shield. However, more recent Rb-Sr data and zircon ages for clastic metasedimentary rocks are in agreement with our new zircon age, suggesting that initial oceanic magmatism in the Arabian Shield did not begin until after 900 Ma and was coeval with arc evolution in the southern Red Sea Hills of the Sudan. 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.