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Not all supercontinents are created equal: Gondwana-Rodinia case study

2013; Geological Society of America; Volume: 41; Issue: 7 Linguagem: Inglês

10.1130/g34520.1

1943-2682

Christopher J. Spencer, C. J. Hawkesworth, Peter A. Cawood, Bruno Dhuime,

Paleontology and Stratigraphy of Fossils

Research Article| July 01, 2013 Not all supercontinents are created equal: Gondwana-Rodinia case study Christopher J. Spencer; Christopher J. Spencer 1Department of Earth and Environmental Sciences, University of St. Andrews, North Street, St. Andrews KY16 9AL, UK Search for other works by this author on: GSW Google Scholar Chris Hawkesworth; Chris Hawkesworth 1Department of Earth and Environmental Sciences, University of St. Andrews, North Street, St. Andrews KY16 9AL, UK Search for other works by this author on: GSW Google Scholar Peter A. Cawood; Peter A. Cawood 1Department of Earth and Environmental Sciences, University of St. Andrews, North Street, St. Andrews KY16 9AL, UK Search for other works by this author on: GSW Google Scholar Bruno Dhuime Bruno Dhuime 1Department of Earth and Environmental Sciences, University of St. Andrews, North Street, St. Andrews KY16 9AL, UK2Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, UK Search for other works by this author on: GSW Google Scholar Author and Article Information Christopher J. Spencer 1Department of Earth and Environmental Sciences, University of St. Andrews, North Street, St. Andrews KY16 9AL, UK Chris Hawkesworth 1Department of Earth and Environmental Sciences, University of St. Andrews, North Street, St. Andrews KY16 9AL, UK Peter A. Cawood 1Department of Earth and Environmental Sciences, University of St. Andrews, North Street, St. Andrews KY16 9AL, UK Bruno Dhuime 1Department of Earth and Environmental Sciences, University of St. Andrews, North Street, St. Andrews KY16 9AL, UK2Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, UK Publisher: Geological Society of America Received: 14 Nov 2012 Accepted: 27 Feb 2013 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2013 Geological Society of America Geology (2013) 41 (7): 795–798. https://doi.org/10.1130/G34520.1 Article history Received: 14 Nov 2012 Accepted: 27 Feb 2013 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Christopher J. Spencer, Chris Hawkesworth, Peter A. Cawood, Bruno Dhuime; Not all supercontinents are created equal: Gondwana-Rodinia case study. Geology 2013;; 41 (7): 795–798. doi: https://doi.org/10.1130/G34520.1 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 The geologic records associated with the formation of the supercontinents Rodinia and Gondwana have markedly different seawater Sr and zircon Hf isotopic signatures. Rodinia-related (Grenville-Sveconorwegian-Sunsas) orogens display significantly less enriched crustal signatures than Gondwana-related (Pan-African) orogens. Seawater Sr isotope ratios also exhibit a more pronounced crustal signal during the span of the Gondwana supercontinent than at the time of Rodinia. Such isotopic differences are attributed to the age and nature of the continental margins involved in the collisional assembly, and specifically to the depleted mantle model ages, and hence the isotope ratios of the material weathered into the oceans. In our preferred model the isotopic signatures of Rodinia-suturing orogens reflect the closure of ocean basins with dual subduction zones verging in opposite directions, analogous to the modern Pacific basin. This would have resulted in the juxtaposition of juvenile continental and island arc terrains on both margins of the colliding plates, thus further reworking juvenile crust. Conversely, the assembly of Gondwana was accomplished primarily via a number of single-sided subduction zones that involved greater reworking of ancient cratonic lithologies within the collisional sutures. The proposed geodynamic models of the assembly of Rodinia and Gondwana provide a connection between the geodynamic configuration of supercontinent assembly and its resulting isotopic signature. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.