Accretion and subduction tectonics in the Chugach Mountains and Copper River Basin, Alaska: Initial results of the Trans-Alaska Crustal Transect

Abstract

Research Article| June 01, 1986 Accretion and subduction tectonics in the Chugach Mountains and Copper River Basin, Alaska: Initial results of the Trans-Alaska Crustal Transect Robert A. Page; Robert A. Page 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar George Plafker; George Plafker 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Gary S. Fuis; Gary S. Fuis 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Warren J. Nokleberg; Warren J. Nokleberg 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Elizabeth L. Ambos; Elizabeth L. Ambos 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Walter D. Mooney; Walter D. Mooney 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar David L. Campbell David L. Campbell 2U.S. Geological Survey, Box 25046, Denver, Colorado 80225 Search for other works by this author on: GSW Google Scholar Geology (1986) 14 (6): 501–505. https://doi.org/10.1130/0091-7613(1986)14<501:AASTIT>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 Robert A. Page, George Plafker, Gary S. Fuis, Warren J. Nokleberg, Elizabeth L. Ambos, Walter D. Mooney, David L. Campbell; Accretion and subduction tectonics in the Chugach Mountains and Copper River Basin, Alaska: Initial results of the Trans-Alaska Crustal Transect. Geology 1986;; 14 (6): 501–505. doi: https://doi.org/10.1130/0091-7613(1986)14<501:AASTIT>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 SocietyGeology Search Advanced Search Abstract Geologic, seismic, gravity, and magnetic data from the northern Chugach Mountains and southern Copper River Basin, Alaska, indicate that the Chugach terrane (CGT) and the composite Peninsular/Wrangellia terrane (PET/WRT) are thin (<10 km), rootless sheets bounded on the south by north-dipping thrust faults that sole into a shallow, horizontal, low-velocity zone. The CGT has been thrust at least 40 km beneath the PET/WRT along the Border Ranges fault system (BRFS). Adjacent to the BRFS, uplift and erosion of 30–40 km since Jurassic time have exposed blueschist-facies rocks in the CGT and mafic and ultramafic cumulate rocks in the PET/WRT. Four paired north-dipping layers of low and high seismic velocities extend beneath the northern CGT and southern PET/WRT and may be slices of subducted oceanic crust and upper mantle; the upper two pairs may now be joined to the continental plate. 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.