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• W1985192544 abstract "Research Article| November 01, 2014 Remnants of ancient Australia in Vanuatu: Implications for crustal evolution in island arcs and tectonic development of the southwest Pacific Janrich Buys; Janrich Buys School of Earth and Environmental Sciences, James Cook University, Townsville 4811, Australia Search for other works by this author on: GSW Google Scholar Carl Spandler; Carl Spandler * School of Earth and Environmental Sciences, James Cook University, Townsville 4811, Australia *E-mail: carl.spandler@jcu.edu.au. Search for other works by this author on: GSW Google Scholar Robert J. Holm; Robert J. Holm School of Earth and Environmental Sciences, James Cook University, Townsville 4811, Australia Search for other works by this author on: GSW Google Scholar Simon W. Richards Simon W. Richards School of Earth and Environmental Sciences, James Cook University, Townsville 4811, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Janrich Buys School of Earth and Environmental Sciences, James Cook University, Townsville 4811, Australia Carl Spandler * School of Earth and Environmental Sciences, James Cook University, Townsville 4811, Australia Robert J. Holm School of Earth and Environmental Sciences, James Cook University, Townsville 4811, Australia Simon W. Richards School of Earth and Environmental Sciences, James Cook University, Townsville 4811, Australia *E-mail: carl.spandler@jcu.edu.au. Publisher: Geological Society of America Received: 07 Aug 2014 Revision Received: 10 Aug 2014 Accepted: 11 Aug 2014 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2014 Geological Society of America Geology (2014) 42 (11): 939–942. https://doi.org/10.1130/G36155.1 Article history Received: 07 Aug 2014 Revision Received: 10 Aug 2014 Accepted: 11 Aug 2014 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Janrich Buys, Carl Spandler, Robert J. Holm, Simon W. Richards; Remnants of ancient Australia in Vanuatu: Implications for crustal evolution in island arcs and tectonic development of the southwest Pacific. Geology 2014;; 42 (11): 939–942. doi: https://doi.org/10.1130/G36155.1 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 We report new geochemical and geochronological data from igneous rocks of the little studied western belt of the Vanuatu intraoceanic arc. Ar-Ar dating of igneous hornblende from hornblende andesites and U-Pb dating of zircon from a tonalite place the time of formation of these rocks in the late Eocene to Miocene; therefore, they represent part of the earliest arc development at Vanuatu. The petrological and geochemical characteristics of these rocks are typical of island arc magmas, except they contain inherited zircon grains with significant age populations at ca. 2.8–2.5 Ga, 2.0–1.8 Ga, 1.75–1.5 Ga, 850–700 Ma, 530–430 Ma, and 330–220 Ma. This inheritance signature is unlike anything recognized from the oceanic realm of the southwest Pacific, but in general matches the age of major crustal blocks of the Australian continent. An exception is the significant proportion of zircons of Rodinia breakup age (ca. 800 Ma) that previously have not been found in such amounts in eastern Australia or the southwest Pacific. We propose that part of the Vanuatu arc basement comprises continental material that was rifted and transported thousands of kilometers from northeastern Australia prior to the Cenozoic. The presence of hitherto-unrecognized ancient continental material within an intraoceanic arc provides an alternative source for the crustal trace element and isotopic signature of island arc magmas, and may help reconcile the relatively large thickness and low density of the crust of Vanuatu and possible other intraoceanic arcs. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W1985192544 title "Remnants of ancient Australia in Vanuatu: Implications for crustal evolution in island arcs and tectonic development of the southwest Pacific" @default.
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