Major dextral transcurrent displacements along the Northern Rocky Mountain Trench and related lineaments in north-central British Columbia

Abstract

Research Article| January 01, 1985 Major dextral transcurrent displacements along the Northern Rocky Mountain Trench and related lineaments in north-central British Columbia H. GABRIELSE H. GABRIELSE 1Geological Survey of Canada, 100 West Pender Street, Vancouver, B.C. V6B 1R8, Canada Search for other works by this author on: GSW Google Scholar GSA Bulletin (1985) 96 (1): 1–14. https://doi.org/10.1130/0016-7606(1985)96<1:MDTDAT>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 H. GABRIELSE; Major dextral transcurrent displacements along the Northern Rocky Mountain Trench and related lineaments in north-central British Columbia. GSA Bulletin 1985;; 96 (1): 1–14. doi: https://doi.org/10.1130/0016-7606(1985)96<1:MDTDAT>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 Northern Rocky Mountain Trench and a number of other prominent lineaments, along and east of the eastern margin of the Intermontane Belt, mark faults along which dextral transcurrent movements have been dominant. Offsets of shelf to off-shelf facies boundaries in lower Paleozoic rocks indicate a cumulative displacement of at least 750 km, and probably >900 km, within the system of faults related to those in the Northern Rocky Mountain and the Tintina Trenches. Farther west, another system of faults appears to offset plutons and stratigraphic assemblages along the eastern margin of the Intermontane Belt by as much as 300 km. These faults, including the Kutcho and the Pinchi, connect in part with the Teslin Suture Zone in Yukon Territory and probably with the Fraser River-Straight Creek fault zone in southern British Columbia. Although dextral transcurrent faulting may have taken place between the Middle Jurassic and early Cenozoic, the most convincing evidence points to middle Cretaceous and particularly to early Cenozoic (Eocene?) displacements. The Eocene(?) movements were temporally related to plutonism, volcanism, lamprophyre dike emplacement, high heat flow, sedimentation in grabens, and rapid uplift of northwesterly trending elongate ranges. Climactic episodes of granite emplacement, particularly in and near the northern Omineca Crystalline Belt, at ∼100 m.y., 70 m.y., and 50 m.y. ago may have been facilitated by changes from dominantly compressional to dominantly transcurrent and related tensional strain. 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.