Possible pre-Cenozoic left-lateral slip on the Yalakom fault, southwestern British Columbia

Abstract

Research Article| July 01, 1988 Possible pre-Cenozoic left-lateral slip on the Yalakom fault, southwestern British Columbia Martin G. Miller Martin G. Miller 1Department of Geological Sciences, AJ-20, University of Washington Seattle, Washington 98195 Search for other works by this author on: GSW Google Scholar Author and Article Information Martin G. Miller 1Department of Geological Sciences, AJ-20, University of Washington Seattle, Washington 98195 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1988) 16 (7): 584–587. https://doi.org/10.1130/0091-7613(1988)016<0584:PPCLLS>2.3.CO;2 Article history First Online: 02 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 Martin G. Miller; Possible pre-Cenozoic left-lateral slip on the Yalakom fault, southwestern British Columbia. Geology 1988;; 16 (7): 584–587. doi: https://doi.org/10.1130/0091-7613(1988)016<0584:PPCLLS>2.3.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 Yalakom fault strikes northwest for nearly 250 km in southern British Columbia. Immediately north of the town of Lillooet, between the Yalakom and Fraser faults, structures within Jurassic and Cretaceous clastic rocks suggest that the Yalakom fault had a history of left-lateral followed by high-angle contractional motion. North- and northeast-trending folds offset by west-northwest-trending left-lateral and normal(?) faults, plus numerous small conjugate left- and right-lateral faults with associated extension fractures fit a strain ellipse for left-lateral slip on the Yalakom fault. Younger right-lateral bedding-plane faults, a large vertically plunging open fold, and a thrust fault adjacent to the Yalakom fault zone suggest later high-angle contractional motion.Left-lateral motion preceded, whereas contractional motion probably coincided with, 50 Ma Fraser fault deformation. To the northwest along the Yalakom fault, and on the Pasayten fault in Washington, left-lateral slip possibly occurred between about 100 and 95 Ma. Left lateral motion may prove an important element in the pre-Tertiary history of southern British Columbia. 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.