Title: U-Pb zircon age constraints on late Neoproterozoic glaciation in Tasmania
Abstract: Research Article| October 01, 2004 U-Pb zircon age constraints on late Neoproterozoic glaciation in Tasmania Clive R. Calver; Clive R. Calver 1Mineral Resources Tasmania, P.O. Box 56, Rosny Park, Tasmania 7018, Australia Search for other works by this author on: GSW Google Scholar Lance P. Black; Lance P. Black 2Minerals Division, Geoscience Australia, GPO Box 378, Canberra, ACT 2601, Australia, and Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia Search for other works by this author on: GSW Google Scholar John L. Everard; John L. Everard 3Mineral Resources Tasmania, P.O. Box 56, Rosny Park, Tasmania 7018, Australia Search for other works by this author on: GSW Google Scholar David B. Seymour David B. Seymour 3Mineral Resources Tasmania, P.O. Box 56, Rosny Park, Tasmania 7018, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Clive R. Calver 1Mineral Resources Tasmania, P.O. Box 56, Rosny Park, Tasmania 7018, Australia Lance P. Black 2Minerals Division, Geoscience Australia, GPO Box 378, Canberra, ACT 2601, Australia, and Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia John L. Everard 3Mineral Resources Tasmania, P.O. Box 56, Rosny Park, Tasmania 7018, Australia David B. Seymour 3Mineral Resources Tasmania, P.O. Box 56, Rosny Park, Tasmania 7018, Australia Publisher: Geological Society of America Received: 05 Apr 2004 Revision Received: 02 Jul 2004 Accepted: 14 Jul 2004 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2004) 32 (10): 893–896. https://doi.org/10.1130/G20713.1 Article history Received: 05 Apr 2004 Revision Received: 02 Jul 2004 Accepted: 14 Jul 2004 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Clive R. Calver, Lance P. Black, John L. Everard, David B. Seymour; U-Pb zircon age constraints on late Neoproterozoic glaciation in Tasmania. Geology 2004;; 32 (10): 893–896. doi: https://doi.org/10.1130/G20713.1 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 Two new U-Pb dates (sensitive high-resolution ion microprobe on zircon) have an important bearing on the age of the Marinoan (Elatina) glaciation, a presumed global chronostratigraphic marker that has been previously poorly constrained in terms of its numerical age. In the Grassy Group of King Island, intermediate sills dated as 575 ± 3 Ma intrude an Elatina-equivalent diamictite (the Cottons Breccia), cap carbonate, and postglacial shale. The sills are locally vesicular, stratigraphically limited, probably intruded at shallow depth, and probably closely postdate the end of Marinoan glaciation. In the Togari Group of northwest Tasmania, a rhyodacite flow dated as 582 ± 4 Ma underlies the Croles Hill Diamictite, which is at least partly glaciogenic. No cap carbonate is known from the Croles Hill Diamictite, but in other respects its stratigraphic setting is similar to the Cottons Breccia. The two dates together support a significantly younger age (ca. 580 Ma) for the Marinoan glaciation than some previous estimates, and suggest correlation with the Gaskiers Formation of Newfoundland. The new data cannot exclude the possibility of a ca. 620 Ma age for the Marinoan glaciation, as suggested by recent evidence from outside Australia, but this would require a more complex and much less probable interpretation of the Tasmanian stratigraphic relationships. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Publication Year: 2004
Publication Date: 2004-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 162
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