Research Article| November 01, 2016 A continental arc tempo discovered in the Pacific-Gondwana margin mudpile? Timothy Paulsen; Timothy Paulsen 1Department of Geology, University of Wisconsin Oshkosh, Oshkosh, Wisconsin 54901, USA Search for other works by this author on: GSW Google Scholar Chad Deering; Chad Deering 2Department of Geological and Mining Engineering and Sciences, Michigan Technological University, Houghton, Michigan 49931, USA Search for other works by this author on: GSW Google Scholar Jakub Sliwinski; Jakub Sliwinski 3Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zurich, 8092 Zurich, Switzerland Search for other works by this author on: GSW Google Scholar Olivier Bachmann; Olivier Bachmann 3Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zurich, 8092 Zurich, Switzerland Search for other works by this author on: GSW Google Scholar Marcel Guillong Marcel Guillong 3Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zurich, 8092 Zurich, Switzerland Search for other works by this author on: GSW Google Scholar Author and Article Information Timothy Paulsen 1Department of Geology, University of Wisconsin Oshkosh, Oshkosh, Wisconsin 54901, USA Chad Deering 2Department of Geological and Mining Engineering and Sciences, Michigan Technological University, Houghton, Michigan 49931, USA Jakub Sliwinski 3Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zurich, 8092 Zurich, Switzerland Olivier Bachmann 3Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zurich, 8092 Zurich, Switzerland Marcel Guillong 3Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zurich, 8092 Zurich, Switzerland Publisher: Geological Society of America Received: 03 Jun 2016 Revision Received: 18 Aug 2016 Accepted: 19 Aug 2016 First Online: 02 Jun 2017 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2016 Geological Society of America Geology (2016) 44 (11): 915–918. https://doi.org/10.1130/G38189.1 Article history Received: 03 Jun 2016 Revision Received: 18 Aug 2016 Accepted: 19 Aug 2016 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Timothy Paulsen, Chad Deering, Jakub Sliwinski, Olivier Bachmann, Marcel Guillong; A continental arc tempo discovered in the Pacific-Gondwana margin mudpile?. Geology 2016;; 44 (11): 915–918. doi: https://doi.org/10.1130/G38189.1 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 integration of detrital zircon age and trace element analyses provides a powerful tool with which to reconstruct continental arc evolution. Detrital zircons from the Ross-Delamerian orogen along the Pacific-Gondwana margin in north Victoria Land in Antarctica yield a broad 700–500 Ma U-Pb age population that shows a prominent period of activity centered at ca. 630–550 Ma. This activity is well correlated with the highest zircon Th/U and U/Yb ratios, suggesting an increase in lithospheric contribution coincident with fluid input from oceanic slab subduction, respectively. A low Yb/Gd ratio over this same period also suggests crustal thickening. Determination of zircon parent rock types using trace element proxies reveals the presence of previously unrecognized distinct pulses of granitoid activity that occur over tens of millions of years. Lulls between granitoid flare-ups overlap with increases in mafic-carbonatite-alkaline magma production, suggesting an influx of mantle or lower crustal melts during syn-subduction extension. A concomitant increase in the number of metamorphic zircons (U/Th > 10) and 40Ar/39Ar white mica cooling ages found during these extensional episodes suggest that significant thermal perturbations of the crust coincided with orogenic cooling, which was possibly influenced by uplift and exhumation. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.