Age and regional tectonic implications of Late Cretaceous thrusting and Eocene extension, Cabinet Mountains, northwest Montana and northern Idaho

Abstract

Research Article| August 01, 1994 Age and regional tectonic implications of Late Cretaceous thrusting and Eocene extension, Cabinet Mountains, northwest Montana and northern Idaho JEFFREY A. FILLIPONE; JEFFREY A. FILLIPONE 1Department of Earth and Space Sciences, University of California, Los Angeles, California 90024-1567 Search for other works by this author on: GSW Google Scholar AN YIN AN YIN 1Department of Earth and Space Sciences, University of California, Los Angeles, California 90024-1567 Search for other works by this author on: GSW Google Scholar Author and Article Information JEFFREY A. FILLIPONE 1Department of Earth and Space Sciences, University of California, Los Angeles, California 90024-1567 AN YIN 1Department of Earth and Space Sciences, University of California, Los Angeles, California 90024-1567 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1994) 106 (8): 1017–1032. https://doi.org/10.1130/0016-7606(1994)106<1017:AARTIO>2.3.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 JEFFREY A. FILLIPONE, AN YIN; Age and regional tectonic implications of Late Cretaceous thrusting and Eocene extension, Cabinet Mountains, northwest Montana and northern Idaho. GSA Bulletin 1994;; 106 (8): 1017–1032. doi: https://doi.org/10.1130/0016-7606(1994)106<1017:AARTIO>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 SocietyGSA Bulletin Search Advanced Search Abstract Understanding the kinematic and temporal relationships between the Cordilleran magmatic belt and the foreland fold and thrust belt can provide insights into the development of thrust systems in retro-arc settings. Combining data from field mapping and 40Ar/39Ar geochronometry and thermochronometry, we show that Late Cretaceous thrusting in the Cabinet Mountains of the northwest Montana thrust belt coincided both spatially and temporally with hinterland magmatism. Thrusting and magmatism in the hinterland of the northwest and southwest Montana thrust belt were coeval with development of the foreland fold and thrust belt during the Late Cretaceous. Movement on the Moyie thrust, a principal thrust in the western part of the Purcell anticlinorium, occurred between ca. 71 and 69 Ma. In the Cabinet Mountains, the anticlinorium developed by systems of east- and west- directed trusts, with a southward decrease in slip on the Moyie thrust that the heloped contribute to less overall shortening in the anticlinorium in Montana than in British Columbia. The lithosphere underlying the anticlinorium may have been thermally weakened by magmatic heating, promoting the development of both the Late Cretaceous thrusts and early to middle Eocene normal faults. 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.