Grenville-age magmatism at the South Tasman Rise (Australia): A new piercing point for the reconstruction of Rodinia

Abstract

Research Article| October 01, 2005 Grenville-age magmatism at the South Tasman Rise (Australia): A new piercing point for the reconstruction of Rodinia A.M. Fioretti; A.M. Fioretti 1Consiglio Nazionale delle Ricerche (CNR), Istituto di Geoscienze e Georisorse, Corso Garibaldi 37, I-35137 Padova, Italy, and Visiting Fellows at Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia Search for other works by this author on: GSW Google Scholar L.P. Black; L.P. Black 2Minerals Division, Geoscience Australia, GPO Box 378, Canberra, ACT 2601, Australia, and Visiting Fellows at Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia Search for other works by this author on: GSW Google Scholar J. Foden; J. Foden 3Department of Geology and Geophysics, University of Adelaide, Adelaide, SA 5005, Australia Search for other works by this author on: GSW Google Scholar D. Visonà D. Visonà 4Dipartimento di Mineralogia e Petrologia, Università di Padova, Corso Garibaldi 37, I-35137 Padova, Italy Search for other works by this author on: GSW Google Scholar Author and Article Information A.M. Fioretti 1Consiglio Nazionale delle Ricerche (CNR), Istituto di Geoscienze e Georisorse, Corso Garibaldi 37, I-35137 Padova, Italy, and Visiting Fellows at Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia L.P. Black 2Minerals Division, Geoscience Australia, GPO Box 378, Canberra, ACT 2601, Australia, and Visiting Fellows at Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia J. Foden 3Department of Geology and Geophysics, University of Adelaide, Adelaide, SA 5005, Australia D. Visonà 4Dipartimento di Mineralogia e Petrologia, Università di Padova, Corso Garibaldi 37, I-35137 Padova, Italy Publisher: Geological Society of America Received: 02 Mar 2005 Revision Received: 03 May 2005 Accepted: 03 May 2005 First Online: 03 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2005) 33 (10): 769–772. https://doi.org/10.1130/G21671.1 Article history Received: 02 Mar 2005 Revision Received: 03 May 2005 Accepted: 03 May 2005 First Online: 03 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 A.M. Fioretti, L.P. Black, J. Foden, D. Visonà; Grenville-age magmatism at the South Tasman Rise (Australia): A new piercing point for the reconstruction of Rodinia. Geology 2005;; 33 (10): 769–772. doi: https://doi.org/10.1130/G21671.1 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 A U-Pb zircon sensitive high-resolution ion microprobe age of 1119.4 ± 8.5 Ma, obtained from a quartz syenite dredged from the South Tasman Rise (Australia), provides the first direct evidence of the presence of Grenville-age magmatic rocks along the central part of the hypothesized Australia–East Antarctica conjugate margin of Laurentia. The distinctive mineralogy and geochemistry of the rock and its Sm-Nd and Pb isotopic signatures 1) indicate that it represents a juvenile Grenville-age addition to the crust, 2) support a correlation with the Grenville magmatic province of the western United States, and 3) set a unique pivotal point for a precise reconstruction of Rodinia. The resulting scenario implies the presence of a new magmatic province crossing the East Antarctic craton, the extension of Proterozoic belts of southwest Laurentia to East Antarctica, and appears consistent with the Australia–western United States (AUSWUS) model. This tectonic setting envisages a near-local source for the ubiquitous Grenville-age detrital zircon population in marginal Neoproterozoic to early Paleozoic Gondwanan sequences and suggests a possible direct source for the widespread Grenville-age inherited zircon component observed in most Paleozoic granites in northern Victoria Land (Antarctica) and east Tasmania (Australia). You do not have access to this content, please speak to your institutional administrator if you feel you should have access.