Columbia River fault zone; southeastern margin of the Shuswap and Monashee complexes, southern British Columbia

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doi: 10.1139/e81-108
Authors:Read, Peter B.; Brown, Richard L.
Author Affiliations:Primary:
Geotex Consult., Vancouver, BC, Canada
Other:
Carleton Univ., Canada
Volume Title:Canadian Journal of Earth Sciences Revue Canadienne des Sciences de la Terre
Source:Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre, 18(7), p.1127-1145. Publisher: National Research Council of Canada, Ottawa, ON, Canada. ISSN: 0008-4077
Publication Date:1981
Note:In English with French summary. 41 refs.; illus. incl. 1 tables, sects., geol. sketch maps
Summary:The zone extends for 250 km from S of Nakusp to N of Bigmouth Creek. It is a composite fault zone, which dips 20-20oE and separates major tectonic elements; it retains evidence of a long history of movement extending from the mid-Mesozoic to the Eocene. Early deformation formed a mylonite zone up to 1 km wide in which rocks crystallized under greenschist facies conditions. Later displacement caused intense fracturing, folding of mylonite, and development of gouge zones, and late movement was again normal. Metamorphic zones, juxtaposed along the fault, imply a minimum dip-slip displacement of 15-25 km. The tectonic slices E of the Columbia River fault zone are part of an allochthonous cover that was transported at least tens of km eastward over the Shuswap and Monashee complexes during the Late Jurassic. [P.Br.]
Subjects:Allochthons; Decollement; Dip-slip faults; Displacements; Fabric; Fault zones; Faults; Gouge; Interpretation; Metamorphic rocks; Monashee Complex; Mylonites; Normal faults; Slickensides; Structural analysis; Structural geology; Tectonics; Textures; British Columbia; Canada; North America; Shuswap Complex; Western Canada; Columbia River Fault
Coordinates:N500000 N520000 W1170000 W1190000
Abstract Numbers:82M/0939
Record ID:1982001860
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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