Tectonic significance of 400 Ma zircon ages for ophiolitic rocks from the Lachlan fold belt, eastern Australia

Research Article| December 01, 1996 Tectonic significance of 400 Ma zircon ages for ophiolitic rocks from the Lachlan fold belt, eastern Australia I. T. Graham; I. T. Graham 1Department of Applied Geology, University of Technology, Sydney, P.O. Box 123, Broadway, Sydney, NSW 2007, Australia Search for other works by this author on: GSW Google Scholar B. J. Franklin; B. J. Franklin 1Department of Applied Geology, University of Technology, Sydney, P.O. Box 123, Broadway, Sydney, NSW 2007, Australia Search for other works by this author on: GSW Google Scholar B. Marshall; B. Marshall 1Department of Applied Geology, University of Technology, Sydney, P.O. Box 123, Broadway, Sydney, NSW 2007, Australia Search for other works by this author on: GSW Google Scholar E. C. Leitch; E. C. Leitch 1Department of Applied Geology, University of Technology, Sydney, P.O. Box 123, Broadway, Sydney, NSW 2007, Australia Search for other works by this author on: GSW Google Scholar M. Fanning M. Fanning 2Research School of Earth Sciences, Australian National University, Canberra, ACT 2601, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information I. T. Graham 1Department of Applied Geology, University of Technology, Sydney, P.O. Box 123, Broadway, Sydney, NSW 2007, Australia B. J. Franklin 1Department of Applied Geology, University of Technology, Sydney, P.O. Box 123, Broadway, Sydney, NSW 2007, Australia B. Marshall 1Department of Applied Geology, University of Technology, Sydney, P.O. Box 123, Broadway, Sydney, NSW 2007, Australia E. C. Leitch 1Department of Applied Geology, University of Technology, Sydney, P.O. Box 123, Broadway, Sydney, NSW 2007, Australia M. Fanning 2Research School of Earth Sciences, Australian National University, Canberra, ACT 2601, Australia Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1996) 24 (12): 1111–1114. https://doi.org/10.1130/0091-7613(1996)024<1111:TSOMZA>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 I. T. Graham, B. J. Franklin, B. Marshall, E. C. Leitch, M. Fanning; Tectonic significance of 400 Ma zircon ages for ophiolitic rocks from the Lachlan fold belt, eastern Australia. Geology 1996;; 24 (12): 1111–1114. doi: https://doi.org/10.1130/0091-7613(1996)024<1111:TSOMZA>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 New SHRIMP ion microprobe data provide constraints on the age of formation of ophiolitic rocks from the Tumut region of the Lachlan fold belt, southeastern Australia. Magmatic zircons from plagiogranites within both the Coolac serpentinite belt and Wambidgee serpentinite belt give 206Pb/238U ages of about 400 Ma. This Devonian age is considerably younger than those previously proposed for these ophiolitic rocks (Cambrian-Ordovician to Early Silurian) and provides important tectonic data for this region of the Lachlan fold belt. We suggest that these rocks formed within a narrow marginal basin akin to those of Cretaceous age within the Chilean Andes of South America. The dates presented are within the 420–390 Ma range assigned to most of the granitic bodies of the Lachlan fold belt. We therefore suggest that the generation of both the ophiolitic rocks and granitic magmas of the Lachlan fold belt were part of the same major tectonothermal event. 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.