Tectonic evolution of lower Proterozoic rocks, Uinta Mountains, Utah and Colorado

Abstract

Research Article| October 01, 1982 Tectonic evolution of lower Proterozoic rocks, Uinta Mountains, Utah and Colorado J. W. SEARS; J. W. SEARS 1Department of Geology, University of Montana, Missoula, Montana 59801 Search for other works by this author on: GSW Google Scholar P. J. GRAFF; P. J. GRAFF 2Research Associates of Wyoming, 2220 East Seventeenth Street, Casper, Wyoming 82609 Search for other works by this author on: GSW Google Scholar G. S. HOLDEN G. S. HOLDEN 3Department of Geology, Colorado School of Mines, Golden, Colorado 80401 Search for other works by this author on: GSW Google Scholar Author and Article Information J. W. SEARS 1Department of Geology, University of Montana, Missoula, Montana 59801 P. J. GRAFF 2Research Associates of Wyoming, 2220 East Seventeenth Street, Casper, Wyoming 82609 G. S. HOLDEN 3Department of Geology, Colorado School of Mines, Golden, Colorado 80401 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1982) 93 (10): 990–997. https://doi.org/10.1130/0016-7606(1982)93<990:TEOLPR>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 Email Permissions Search Site Citation J. W. SEARS, P. J. GRAFF, G. S. HOLDEN; Tectonic evolution of lower Proterozoic rocks, Uinta Mountains, Utah and Colorado. GSA Bulletin 1982;; 93 (10): 990–997. doi: https://doi.org/10.1130/0016-7606(1982)93<990:TEOLPR>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 Rocks of the early Proterozoic orogenic system that fringes the Archean-aged Wyoming province are exposed along the Uinta fault in the northeastern Uinta Mountains of Utah and Colorado. Exposed here are the Red Creek Quartzite, an early Proterozoic-type miogeoclinal metasedimentary sequence more than 4 km thick, and an underlying, newly recognized, Archean gneiss complex more than 2.7 b.y. old. During the Hudsonian orogenic period, the miogeoclinal sequence was emplaced northward over the Archean complex by tectonic translation along a thick mylonite zone in the waning phases of upper amphibolite metamorphism. The orogen was disrupted by east-trending block faults with several kilometres displacement during initiation of the Uinta aulacogen and was buried by more than 7 km of middle Proterozoic sediments of the Uinta Mountain Group. The middle Proterozoic block faults were reactivated with reversed sense of displacement during the Laramide uplift of the Uinta Mountain block. 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.