Tectonic accretion and the origin of the two major metamorphic and plutonic welts in the Canadian Cordillera

Abstract

Research Article| February 01, 1982 Tectonic accretion and the origin of the two major metamorphic and plutonic welts in the Canadian Cordillera J.W.H. Monger; J.W.H. Monger 1Geological Survey of Canada, 100 West Pender Street, Vancouver, British Columbia V6B 1R8, Canada Search for other works by this author on: GSW Google Scholar R. A. Price; R. A. Price 2Department of Geological Sciences, Queen's University, Kingston, Ontario K7L 3N6, Canada Search for other works by this author on: GSW Google Scholar D. J. Tempelman-Kluit D. J. Tempelman-Kluit 3Department of Indian Affairs and Northern Development, Whitehorse, Yukon, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information J.W.H. Monger 1Geological Survey of Canada, 100 West Pender Street, Vancouver, British Columbia V6B 1R8, Canada R. A. Price 2Department of Geological Sciences, Queen's University, Kingston, Ontario K7L 3N6, Canada D. J. Tempelman-Kluit 3Department of Indian Affairs and Northern Development, Whitehorse, Yukon, Canada Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1982) 10 (2): 70–75. https://doi.org/10.1130/0091-7613(1982)10<70:TAATOO>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 J.W.H. Monger, R. A. Price, D. J. Tempelman-Kluit; Tectonic accretion and the origin of the two major metamorphic and plutonic welts in the Canadian Cordillera. Geology 1982;; 10 (2): 70–75. doi: https://doi.org/10.1130/0091-7613(1982)10<70:TAATOO>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 The Omineca Crystalline Belt and Coast Plutonic Complex are the two major regional tectonic welts in the Canadian Cordillera in which were concentrated intense deformation, regional metamorphism, granitic magmatism, uplift, and erosion. The welts, which formerly were thought to result from subduction of Pacific Ocean lithosphere beneath the western edge of North America, can now be viewed partly as the result of tectonic overlap and/or compressional thickening of crustal rocks during collisions between North America and two large, composite, allochthonous terranes that were accreted to its ancient western margin. The inner composite terrane, Terrane I, includes four smaller terranes that apparently were together by the end of Triassic time. The outer composite terrane, Terrane II, comprises two terranes, amalgamated by Late Jurassic time. The Omineca Crystalline Belt formed mainly from mid-Jurassic time onward, during and following the collision of Terrane I with North America. This belt straddles the zone of overlap of autochthonous and allochthonous terranes, and its characteristic metamorphism and structure are superimposed on both. The Coast Plutonic Complex formed mainly in Cretaceous to early Tertiary time during and following the attachment of Terrane II to the new, Jurassic, continental margin. It lies along the boundary of Terrane I and Terrane II and involves elements of both terranes. The collisions took place within the overall setting of the North American plate moving relatively westward into various Pacific plates from Jurassic time onward and in conjunction with subduction of Pacific Ocean lithosphere. 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.