Mid-Mesozoic Multiphase Folding Along the Border of the Shuswap Metamorphic Complex

Abstract

Research Article| May 01, 1968 Mid-Mesozoic Multiphase Folding Along the Border of the Shuswap Metamorphic Complex DONALD W HYNDMAN DONALD W HYNDMAN Department of Geology, University of Montana, Missoula, Montana Search for other works by this author on: GSW Google Scholar Author and Article Information DONALD W HYNDMAN Department of Geology, University of Montana, Missoula, Montana Publisher: Geological Society of America Received: 27 Jun 1966 Revision Received: 16 Jan 1967 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1968, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1968) 79 (5): 575–588. https://doi.org/10.1130/0016-7606(1968)79[575:MMFATB]2.0.CO;2 Article history Received: 27 Jun 1966 Revision Received: 16 Jan 1967 First Online: 02 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 DONALD W HYNDMAN; Mid-Mesozoic Multiphase Folding Along the Border of the Shuswap Metamorphic Complex. GSA Bulletin 1968;; 79 (5): 575–588. doi: https://doi.org/10.1130/0016-7606(1968)79[575:MMFATB]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 The high-grade regional metamorphism of the extensive Shuswap metamorphic complex of southeastern British Columbia has been considered by most geologists to be Precambrian in age. On the basis of structural analysis, it is now apparent that low-grade Triassic rocks of the nearby Slocan Group have undergone the same three generations of folding as the Shuswap, beginning with that accompanying regional metamorphism. Intense isoclinal recumbent folding of the first generation accompanied regional metamorphism and development of a schistosity parallel to the axial surfaces of these folds and a penetrative lineation parallel to their axes. Following regional metamorphism, a second deformation, accompanying formation of nearly upright macroscopic folds, formed a strain-slip cleavage by crenulation of the schistosity. Subsequent intrusion of granitic plutons developed mesoscopic folds having coplanar axes in any single domain. This third deformation refolded the nearly constant eastward plunge of earlier folds and lineations into small cones. Deformation accompanying regional metamorphism of the Shuswap complex must have occurred since the Triassic and probably during the Jurassic period. 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.