Pennsylvanian pluton stitching of Wrangellia and the Alexander terrane, Wrangell Mountains, Alaska

Abstract

Research Article| November 01, 1988 Pennsylvanian pluton stitching of Wrangellia and the Alexander terrane, Wrangell Mountains, Alaska M. C. Gardner; M. C. Gardner 1ARCO Oil and Gas Company, 2300 West Plano Parkway, Plano, Texas 75075 Search for other works by this author on: GSW Google Scholar S. C. Bergman; S. C. Bergman 1ARCO Oil and Gas Company, 2300 West Plano Parkway, Plano, Texas 75075 Search for other works by this author on: GSW Google Scholar G. W. Cushing; G. W. Cushing 1ARCO Oil and Gas Company, 2300 West Plano Parkway, Plano, Texas 75075 Search for other works by this author on: GSW Google Scholar E. M. MacKevett, Jr.; E. M. MacKevett, Jr. 21230 Bayview Heights Drive, Los Osos, California 93402 Search for other works by this author on: GSW Google Scholar G. Plafker; G. Plafker 3U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar R. B. Campbell; R. B. Campbell 4Geological Survey of Canada, 100 West Pender Street, Vancouver, British Columbia V6B 1R8, Canada Search for other works by this author on: GSW Google Scholar C. J. Dodds; C. J. Dodds 4Geological Survey of Canada, 100 West Pender Street, Vancouver, British Columbia V6B 1R8, Canada Search for other works by this author on: GSW Google Scholar W. C. McClelland; W. C. McClelland 5Department of Geosciences, University of Arizona, Tucson, Arizona 85721 Search for other works by this author on: GSW Google Scholar P. A. Mueller P. A. Mueller 6Department of Geology, University of Florida, Gainesville, Florida 32611 Search for other works by this author on: GSW Google Scholar Author and Article Information M. C. Gardner 1ARCO Oil and Gas Company, 2300 West Plano Parkway, Plano, Texas 75075 S. C. Bergman 1ARCO Oil and Gas Company, 2300 West Plano Parkway, Plano, Texas 75075 G. W. Cushing 1ARCO Oil and Gas Company, 2300 West Plano Parkway, Plano, Texas 75075 E. M. MacKevett, Jr. 21230 Bayview Heights Drive, Los Osos, California 93402 G. Plafker 3U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 R. B. Campbell 4Geological Survey of Canada, 100 West Pender Street, Vancouver, British Columbia V6B 1R8, Canada C. J. Dodds 4Geological Survey of Canada, 100 West Pender Street, Vancouver, British Columbia V6B 1R8, Canada W. C. McClelland 5Department of Geosciences, University of Arizona, Tucson, Arizona 85721 P. A. Mueller 6Department of Geology, University of Florida, Gainesville, Florida 32611 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1988) 16 (11): 967–971. https://doi.org/10.1130/0091-7613(1988)016<0967:PPSOWA>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation M. C. Gardner, S. C. Bergman, G. W. Cushing, E. M. MacKevett, G. Plafker, R. B. Campbell, C. J. Dodds, W. C. McClelland, P. A. Mueller; Pennsylvanian pluton stitching of Wrangellia and the Alexander terrane, Wrangell Mountains, Alaska. Geology 1988;; 16 (11): 967–971. doi: https://doi.org/10.1130/0091-7613(1988)016<0967:PPSOWA>2.3.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 SocietyGeology Search Advanced Search Abstract A quartz monzonite-syenite-alkali granite plutonic complex in eastern Alaska crosscuts the contact of the Alexander terrane and Wrangellia and intrudes the basement rocks of both terranes. Zircon U-Pb data indicate an intrusion age of 309 ±5 Ma (Middle Pennsylvanian) for the pluton, and 40K-40Ar age data for hornblende separates indicate cooling to about 450 °C during Middle Pennsylvanian-Early Permian time. The new field relations and age data demonstrate that Wrangellia and the Alexander terrane were contiguous during the Middle Pennsylvanian. This conclusion provides an important new constraint on paleogeographic reconstructions of the northwest Cordillera, and necessitates reassessment of stratigraphic and paleomagnetic data that were cited as evidence that the terranes evolved separately until the late Mesozoic. 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.