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Cenozoic and Mesozoic structure of the eastern Basin and Range province, Utah, from COCORP seismic-reflection data

1983; Geological Society of America; Volume: 11; Issue: 9 Linguagem: Inglês

10.1130/0091-7613(1983)11 2.0.co;2

1943-2682

Richard W. Allmendinger, James Sharp, Douglas Von Tish, Laura Serpa, Larry R. Brown, S. Kaufman, Jack Oliver, Robert B. Smith,

Geochemistry and Geologic Mapping

Research Article| September 01, 1983 Cenozoic and Mesozoic structure of the eastern Basin and Range province, Utah, from COCORP seismic-reflection data Richard W. Allmendinger; Richard W. Allmendinger 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853 Search for other works by this author on: GSW Google Scholar James W. Sharp; James W. Sharp 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853 Search for other works by this author on: GSW Google Scholar Douglas Von Tish; Douglas Von Tish 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853 Search for other works by this author on: GSW Google Scholar Laura Serpa; Laura Serpa 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853 Search for other works by this author on: GSW Google Scholar Larry Brown; Larry Brown 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853 Search for other works by this author on: GSW Google Scholar Sidney Kaufman; Sidney Kaufman 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853 Search for other works by this author on: GSW Google Scholar Jack Oliver; Jack Oliver 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853 Search for other works by this author on: GSW Google Scholar Robert B. Smith Robert B. Smith 2Department 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 Richard W. Allmendinger 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853 James W. Sharp 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853 Douglas Von Tish 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853 Laura Serpa 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853 Larry Brown 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853 Sidney Kaufman 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853 Jack Oliver 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853 Robert B. Smith 2Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1983) 11 (9): 532–536. https://doi.org/10.1130/0091-7613(1983)11 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 Richard W. Allmendinger, James W. Sharp, Douglas Von Tish, Laura Serpa, Larry Brown, Sidney Kaufman, Jack Oliver, Robert B. Smith; Cenozoic and Mesozoic structure of the eastern Basin and Range province, Utah, from COCORP seismic-reflection data. Geology 1983;; 11 (9): 532–536. doi: https://doi.org/10.1130/0091-7613(1983)11 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 COCORP seismic-reflection data collected from the eastern Basin and Range in west-central Utah provide information on Cenozoic extensional tectonics, Mesozoic thrusting, and their interrelationships. Those data show a series of remarkably continuous, low-angle reflectors that extend more than 120 km perpendicular to strike and can be traced as deep as 15–20 km. Over that distance, none of these events are significantly cut by any high-angle normal faults. A major detachment beneath the Sevier Desert can be traced from a surface zone of normal faulting to a depth of 12–15 km, with a regional apparent westward dip of 12°. Tentative correlation of upper- and lower-plate events suggests 30–60 km of extensional displacement on this detachment. Whether this structure is a reactivated Mesozoic thrust is uncertain. West-steepening splays off the end of the detachment reach depths of 20 km and may represent a major Mesozoic ramp or zones of distributed ductile shearing during extension. Some events are interpreted to be Mesozoic thrusts, of which at least one (beneath the House Range) has been reactivated during the Cenozoic. The Snake Range decollement dips gently east and has a sense of Cenozoic displacement opposite to that of other Cenozoic detachments farther east. Deep events are most numerous beneath the east side of the Sevier Desert where they occur to depths of 30 km, at the top of or perhaps partly within the anomalously low velocity upper mantle. This content is PDF only. Please click on the PDF icon to access. 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