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Discovery of ultrahigh-temperature metamorphism in the Acadian orogen, Connecticut, USA

2012; Geological Society of America; Volume: 41; Issue: 2 Linguagem: Inglês

10.1130/g33752.1

1943-2682

Jay J. Ague, James O. Eckert, Xu Chu, Ethan F. Baxter, C. Page Chamberlain,

earthquake and tectonic studies

Research Article| February 01, 2013 Discovery of ultrahigh-temperature metamorphism in the Acadian orogen, Connecticut, USA Jay J. Ague; Jay J. Ague * 1Department of Geology and Geophysics, Yale University, P.O. Box 208109, New Haven, Connecticut 06520-8109, USA2Peabody Museum of Natural History, Yale University, New Haven, Connecticut 06511, USA *E-mail: jay.ague@yale.edu. Search for other works by this author on: GSW Google Scholar James O. Eckert, Jr.; James O. Eckert, Jr. 1Department of Geology and Geophysics, Yale University, P.O. Box 208109, New Haven, Connecticut 06520-8109, USA Search for other works by this author on: GSW Google Scholar Xu Chu; Xu Chu 1Department of Geology and Geophysics, Yale University, P.O. Box 208109, New Haven, Connecticut 06520-8109, USA Search for other works by this author on: GSW Google Scholar Ethan F. Baxter; Ethan F. Baxter 3Department of Earth and Environment, Boston University, 685 Commonwealth Avenue, Boston, Massachusetts 02215, USA Search for other works by this author on: GSW Google Scholar C. Page Chamberlain C. Page Chamberlain 4Department of Environmental Earth System Science, Stanford University, Stanford, California 94305, USA Search for other works by this author on: GSW Google Scholar Geology (2013) 41 (2): 271–274. https://doi.org/10.1130/G33752.1 Article history received: 15 Jun 2012 rev-recd: 31 Aug 2012 accepted: 17 Sep 2012 first online: 09 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 Jay J. Ague, James O. Eckert, Xu Chu, Ethan F. Baxter, C. Page Chamberlain; Discovery of ultrahigh-temperature metamorphism in the Acadian orogen, Connecticut, USA. Geology 2013;; 41 (2): 271–274. doi: https://doi.org/10.1130/G33752.1 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 the discovery of granulite facies gneisses that attained ultrahigh temperatures (UHT) above those predicted by typical models of conductive thermal relaxation of over-thickened crust during exhumation. The rocks, which form part of the Acadian (Devonian) metamorphic belt in Connecticut (United States), reached ∼1000 °C and minimum pressures of ∼1 GPa based on Zr-in-rutile thermometry, ternary feldspar compositions, and pseudosection analysis. This is the first regional UHT locality in the United States of which we are aware, and one of relatively few post-Gondwana assembly UHT localities known worldwide. The UHT metamorphism requires heretofore unrecognized contributions to the regional thermal budget. Some possibilities include rapid exhumation from the mantle, underthrusting of extremely radiogenic crust, mechanical strain heating, asthenospheric upwelling, and/or heat input from mantle-derived magmas. The rocks are fairly ordinary looking in outcrop, raising the possibility that other UHT domains remain undiscovered in the orogen. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.