Re-Os geochronology of postglacial black shales in Australia: Constraints on the timing of “Sturtian” glaciation

Abstract

Research Article| September 01, 2006 Re-Os geochronology of postglacial black shales in Australia: Constraints on the timing of "Sturtian" glaciation Brian Kendall; Brian Kendall 1Department of Earth and Atmospheric Sciences, University of Alberta, 1-26 Earth Sciences Building, Edmonton, Alberta T6G 2E3, Canada Search for other works by this author on: GSW Google Scholar Robert A. Creaser; Robert A. Creaser 1Department of Earth and Atmospheric Sciences, University of Alberta, 1-26 Earth Sciences Building, Edmonton, Alberta T6G 2E3, Canada Search for other works by this author on: GSW Google Scholar David Selby David Selby 2Department of Earth Sciences, University of Durham, Durham DH1 3LE, UK Search for other works by this author on: GSW Google Scholar Geology (2006) 34 (9): 729–732. https://doi.org/10.1130/G22775.1 Article history received: 02 Mar 2006 rev-recd: 30 Mar 2006 accepted: 11 Apr 2006 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 Brian Kendall, Robert A. Creaser, David Selby; Re-Os geochronology of postglacial black shales in Australia: Constraints on the timing of "Sturtian" glaciation. Geology 2006;; 34 (9): 729–732. doi: https://doi.org/10.1130/G22775.1 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 New Re-Os dates obtained from black shales overlying the Sturtian and Areyonga glacial deposits in southern and central Australia, respectively, challenge the prevailing consensus of three Neoproterozoic glaciations. The end of Sturtian glaciation in the Adelaide Rift Complex is constrained by a Re-Os date of 643.0 ± 2.4 Ma from the overlying Tindelpina Shale Member (basal Tapley Hill Formation). A Re-Os date of 657.2 ± 5.4 Ma for the basal Aralka Formation constrains the age of the underlying Areyonga glacial deposits in the Amadeus Basin. The Re-Os ages show that the Sturtian and Areyonga glacial deposits are younger than other radiometrically dated (ca. 685–750 Ma) Neoproterozoic glacial intervals previously regarded as possible correlatives. Thus, the "Sturtian" ice age was markedly diachronous, and/or there was more than one "Sturtian"-type glaciation. Some Neoproterozoic glacial deposits may represent the products of regional and diachronous glaciation associated with protracted breakup of the supercontinent Rodinia rather than "snowball" or "slushball" Earth ice ages. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.