Prevolcanic extensional Seaman breakaway fault and its geologic implications for eastern Nevada and western Utah

Abstract

Research Article| March 01, 1992 Prevolcanic extensional Seaman breakaway fault and its geologic implications for eastern Nevada and western Utah WANDA J. TAYLOR; WANDA J. TAYLOR 1Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112 Search for other works by this author on: GSW Google Scholar JOHN M. BARTLEY JOHN M. BARTLEY 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 WANDA J. TAYLOR 1Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112 JOHN M. BARTLEY 1Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1992) 104 (3): 255–266. https://doi.org/10.1130/0016-7606(1992)104<0255:PESBFA>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 Email Permissions Search Site Citation WANDA J. TAYLOR, JOHN M. BARTLEY; Prevolcanic extensional Seaman breakaway fault and its geologic implications for eastern Nevada and western Utah. GSA Bulletin 1992;; 104 (3): 255–266. doi: https://doi.org/10.1130/0016-7606(1992)104<0255:PESBFA>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 Stratigraphic and structural relations indicate that a large-displacement east-dipping normal fault, the Seaman fault, is concealed under southern White River Valley, Nevada. The Seaman fault forms the breakaway of an eastward-rooting pre-middle Oligocene (pre-30.6 Ma) extensional detachment system and may connect northward to the breakaway of the Oligocene extensional system exposed in the Snake, Schell Creek, and Egan Ranges. We propose that this regional breakaway zone bounds a single eastward-rooting Oligocene extensional belt, the Snake-Stampede system, that affected much of eastern Nevada and western Utah. The southward migration with time of Tertiary volcanism in the Great Basin caused varying temporal relations between volcanism and deformation in the Snake-Stampede system; approximately synchronous extension is prevolcanic to the south but syn- to postvolcanic to the north. This pattern conflicts with widely accepted temporal and genetic links between volcanism and crustal extension. Basin and Range crustal extension probably neither triggered nor was triggered by magmatism, but instead volcanism and extension operated somewhat independently. 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.