Research Article| November 01, 2004 Crustal structure, fossil subduction, and the tectonic evolution of the Newfoundland Appalachians: Evidence from a reprocessed seismic reflection survey Arie J. van der Velden; Arie J. van der Velden 1Department of Geology and Geophysics, University of Calgary, 2500 University Drive, Calgary, Alberta T2N 1N4, Canada Search for other works by this author on: GSW Google Scholar Cees R. van Staal; Cees R. van Staal 2Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada Search for other works by this author on: GSW Google Scholar Frederick A. Cook Frederick A. Cook 3Department of Geology and Geophysics, University of Calgary, 2500 University Drive, Calgary, Alberta T2N 1N4, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Arie J. van der Velden 1Department of Geology and Geophysics, University of Calgary, 2500 University Drive, Calgary, Alberta T2N 1N4, Canada Cees R. van Staal 2Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada Frederick A. Cook 3Department of Geology and Geophysics, University of Calgary, 2500 University Drive, Calgary, Alberta T2N 1N4, Canada Publisher: Geological Society of America Received: 06 Nov 2003 Revision Received: 12 Mar 2004 Accepted: 27 Mar 2004 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2004) 116 (11-12): 1485–1498. https://doi.org/10.1130/B25518.1 Article history Received: 06 Nov 2003 Revision Received: 12 Mar 2004 Accepted: 27 Mar 2004 First Online: 08 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 Arie J. van der Velden, Cees R. van Staal, Frederick A. Cook; Crustal structure, fossil subduction, and the tectonic evolution of the Newfoundland Appalachians: Evidence from a reprocessed seismic reflection survey. GSA Bulletin 2004;; 116 (11-12): 1485–1498. doi: https://doi.org/10.1130/B25518.1 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 SocietyGSA Bulletin Search Advanced Search Abstract Reprocessed Lithoprobe seismic reflection data across the Appalachian orogen in Newfoundland provide images of an Ordovician–Devonian collision zone that separates Laurentia from Ganderia, an accreted peri-Gondwanan microcontinent. Prominent reflectivity within Ganderian basement tapers westward and merges with reflections that project beneath the Moho, outlining a probable Ordovician to Devonian subduction zone. Reflectivity within Ganderian basement likely originates from transposed compositional layering within Cambrian–Neoproterozoic arc basement. Migmatites and other high-grade rocks of the Meelpaeg allochthon were likely extruded in the Devonian toward the northeast. The reflection Moho may have been established in the Devonian in parts of Newfoundland by partial melting of the lower crust. Reflection truncations outline a near-vertical Carboniferous strike-slip fault zone that cuts the entire crust. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.