Does the arc accretion model adequately explain the Paleoproterozoic evolution of southern Laurentia?: An expanded interpretation

Abstract

Research Article| February 01, 2007 Does the arc accretion model adequately explain the Paleoproterozoic evolution of southern Laurentia?: An expanded interpretation M.E. Bickford; M.E. Bickford 1Department of Earth Sciences, 204 Heroy Geology Laboratory, Syracuse University, Syracuse, New York 13244-1070, USA Search for other works by this author on: GSW Google Scholar Barbara M. Hill Barbara M. Hill 1Department of Earth Sciences, 204 Heroy Geology Laboratory, Syracuse University, Syracuse, New York 13244-1070, USA Search for other works by this author on: GSW Google Scholar Author and Article Information M.E. Bickford 1Department of Earth Sciences, 204 Heroy Geology Laboratory, Syracuse University, Syracuse, New York 13244-1070, USA Barbara M. Hill 1Department of Earth Sciences, 204 Heroy Geology Laboratory, Syracuse University, Syracuse, New York 13244-1070, USA Publisher: Geological Society of America Received: 06 Jul 2006 Revision Received: 02 Oct 2006 Accepted: 06 Oct 2006 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2007) 35 (2): 167–170. https://doi.org/10.1130/G23174A.1 Article history Received: 06 Jul 2006 Revision Received: 02 Oct 2006 Accepted: 06 Oct 2006 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 M.E. Bickford, Barbara M. Hill; Does the arc accretion model adequately explain the Paleoproterozoic evolution of southern Laurentia?: An expanded interpretation. Geology 2007;; 35 (2): 167–170. doi: https://doi.org/10.1130/G23174A.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 common model for the Paleoproterozoic crustal evolution of southern Laurentia involves southerly accretion of successively younger island arcs from 1780 to 1650 Ma. This model may be oversimplified, however, for although andesite and basaltic andesite, major components of modern island arcs, occur, they are relatively rare, and large volumes of rocks are dominantly bimodal metavolcanic assemblages and related granitoids. Ophiolites occur, but they are also rare, and only one accretionary mélange has been described. Inherited zircons, and common Pb and Nd isotopic data indicate involvement of older crust in ca. 1750 Ma rocks of the Mojave Province of southeastern California and western Arizona and the bimodal assemblages of central Colorado. These data suggest that the bimodal volcanic rocks were derived from pre-existing continental crust, likely of ca. 1850 Ma Trans-Hudson–Penokean age, during extension and partial melting associated with the development of transpressional crustal-scale shear zones. The occurrence of the 1840 ± 1 Ma Elves Chasm pluton in the Grand Canyon demonstrates that rocks of Trans-Hudson–Penokean age are present in southwestern Laurentia. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.