Mechanics of thrust faulting in crystalline basement, Sevier erogenic belt, Utah

Abstract

Research Article| May 01, 1981 Mechanics of thrust faulting in crystalline basement, Sevier erogenic belt, Utah Ronald L. Bruhn; Ronald L. Bruhn 1Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112 Search for other works by this author on: GSW Google Scholar Susan L. Beck Susan L. Beck 1Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112 Search for other works by this author on: GSW Google Scholar Author and Article Information Ronald L. Bruhn 1Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112 Susan L. Beck 1Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1981) 9 (5): 200–204. https://doi.org/10.1130/0091-7613(1981)9<200:MOTFIC>2.0.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 Ronald L. Bruhn, Susan L. Beck; Mechanics of thrust faulting in crystalline basement, Sevier erogenic belt, Utah. Geology 1981;; 9 (5): 200–204. doi: https://doi.org/10.1130/0091-7613(1981)9<200:MOTFIC>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 SocietyGeology Search Advanced Search Abstract Archean and Proterozoic basement was involved in foreland thrust faulting during the Sevier orogeny in northern Utah. Mesozoic structures in the Farmington Canyon Complex provide evidence for the mechanics of crystalline thrust plate transport and emplacement. Structures formed during the last stage of transport of the Farmington Canyon Complex over folded but mostly unmetamorphosed Paleozoic strata occur in the upper plate of the Ogden thrust fault, which was emplaced by cataclastic flow. Intraplate strain was accommodated by brittle faulting, and new greenschist facies minerals formed during hydro-thermal alteration. The Paleozoic strata directly below the thrust fault were ductilely deformed.The upper thrust plate was buckled into an anticline-syncline fold pair as it moved eastward along the Ogden thrust fault. The fold axes were oriented subparallel to the eastward direction of tectonic transport. Shortening at a high angle to the fault plane and eastward extension occurred in the cataclastic gneiss of the upper plate and the underlying sedimentary tectonites. These strains developed as the result of progressive simple shear during overthrusting. Strain due to buckling of the upper plate was superimposed on the simple shear strains in the cataclastic gneiss and caused lateral variations in the three-dimensional strain field within the thrust plate. Constrictional strain developed in the anticlinal hinge area of the thrust plate, whereas flattening strain occurred in the synclinal hinge zone. 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.