Collision-deformed Paleozoic continental margin of Alaska — Foundation for microplate accretion

Abstract

Research Article| November 01, 1980 Collision-deformed Paleozoic continental margin of Alaska — Foundation for microplate accretion MICHAEL CHURKIN, JR.; MICHAEL CHURKIN, JR. 1U.S. Geological Survey, Western Region, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar CLAIRE CARTER; CLAIRE CARTER 1U.S. Geological Survey, Western Region, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar JAMES H. TREXLER, JR. JAMES H. TREXLER, JR. 1U.S. Geological Survey, Western Region, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Author and Article Information MICHAEL CHURKIN, JR. 1U.S. Geological Survey, Western Region, Menlo Park, California 94025 CLAIRE CARTER 1U.S. Geological Survey, Western Region, Menlo Park, California 94025 JAMES H. TREXLER, JR. 1U.S. Geological Survey, Western Region, Menlo Park, California 94025 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1980) 91 (11): 648–654. https://doi.org/10.1130/0016-7606(1980)91<648:CPCMOA>2.0.CO;2 Article history First Online: 01 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 MICHAEL CHURKIN, CLAIRE CARTER, JAMES H. TREXLER; Collision-deformed Paleozoic continental margin of Alaska — Foundation for microplate accretion. GSA Bulletin 1980;; 91 (11): 648–654. doi: https://doi.org/10.1130/0016-7606(1980)91<648:CPCMOA>2.0.CO;2 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 Construction of a map of basement rocks of Alaska has revealed a complexly deformed, arcuate Paleozoic continental margin that is a northwestern extension of the western margin of North America. Three key areas in Alaska (Nation River, Livengood, and Terra Cotta Mountains) have similar sections of Ordovician to Devonian and locally younger Paleozoic siliceous shale and chert, interfingering with limestone and containing various turbidity-current and slope deposits. Microplates moving north from the Pacific basin have collided with this Paleozoic continental margin and deformed and collapsed the original shale-out facies. A similar south-facing collapsed continental margin of middle and late Paleozoic age can be traced across the western Brooks Range of northern Alaska. We believe that this continental margin in the Brooks Range, although it is mainly younger, may be an extension of the same margin in central Alaska. This continental margin has been offset to the Brooks Range along the Porcupine megashear. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.