Title: Structural analysis of a Laramide, basement-involved, foreland fault zone, Rawlins uplift, south-central Wyoming
Abstract: Research Article| January 01, 2005 Structural analysis of a Laramide, basement-involved, foreland fault zone, Rawlins uplift, south-central Wyoming Aaron S. Otteman; Aaron S. Otteman Department of Geology and Geophysics, Dept. 3006, 1000 East University Avenue, University of Wyoming, Laramie, WY 82071, U.S.A. 1Present address: Exxon Mobil Production Company, 396 West Greens Road, CORP-WGR-207, Houston, TX 77067, U.S.A. Search for other works by this author on: GSW Google Scholar Arthur W. Snoke Arthur W. Snoke * Department of Geology and Geophysics, Dept. 3006, 1000 East University Avenue, University of Wyoming, Laramie, WY 82071, U.S.A. *Correspondence should be addressed to: [email protected] Search for other works by this author on: GSW Google Scholar Author and Article Information Aaron S. Otteman 1Present address: Exxon Mobil Production Company, 396 West Greens Road, CORP-WGR-207, Houston, TX 77067, U.S.A. Department of Geology and Geophysics, Dept. 3006, 1000 East University Avenue, University of Wyoming, Laramie, WY 82071, U.S.A. Arthur W. Snoke * Department of Geology and Geophysics, Dept. 3006, 1000 East University Avenue, University of Wyoming, Laramie, WY 82071, U.S.A. *Correspondence should be addressed to: [email protected] Publisher: University of Wyoming Received: 21 Mar 2005 Revision Received: 29 May 2005 Accepted: 03 Jun 2005 First Online: 03 Mar 2017 Online Issn: 1555-7340 Print Issn: 1555-7332 UW Department of Geology and Geophysics Rocky Mountain Geology (2005) 40 (1): 65–89. https://doi.org/10.2113/40.1.65 Article history Received: 21 Mar 2005 Revision Received: 29 May 2005 Accepted: 03 Jun 2005 First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Aaron S. Otteman, Arthur W. Snoke; Structural analysis of a Laramide, basement-involved, foreland fault zone, Rawlins uplift, south-central Wyoming. Rocky Mountain Geology 2005;; 40 (1): 65–89. doi: https://doi.org/10.2113/40.1.65 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 SocietyRocky Mountain Geology Search Advanced Search Abstract The western border of the Hanna Basin is defined by the Rawlins uplift, a Laramide, basement-involved, faulted arch. This north-northwest–south-southeast-trending structure separates the Hanna Basin on the east from the Great Divide Basin (part of the greater Green River depositional basin) on the west. The Rawlins uplift is a west–southwest-vergent, macroscale, fault-related fold. Detailed geologic mapping, construction of serial cross sections, and the incorporation of data from a seismic-reflection profile indicate that displacement along the fault zone flanking the uplift's western margin cannot account for the net structural relief between the Hanna and Great Divide Basins (∼37,000 vertical ft [∼11,285 vertical m] and ∼27,000 vertical ft [∼8,235 vertical m], respectively). The exposed frontal fault traces are interpreted as high-angle (∼70°) splays off a shallowly dipping (∼25°), master fault zone developed within Archean granitic rocks of the Wyoming province. A low-dipping, braided, plastic-to-brittle thrust-fault zone in the Precambrian basement is inferred to accommodate much of the fault displacement and thus account for the structural relief between the core of the uplift and the adjacent basins. Within the study area, displacement along the exposed frontal fault zone decreases from south to north. Within the map area, bedding attitudes along the southwest limb (forelimb) of the uplift range from ∼30–90° with only local areas of overturned beds. However, southwest of the map area, Upper Cretaceous strata are sub-vertical to overturned. On the homoclinal backlimb, dips are ∼10–15° east-northeast into the Hanna Basin. Eastward structural bends at the southern and northern margins of the uplift suggest a component of left-lateral, oblique-slip displacement along the southern margin and right-lateral, oblique-slip displacement along the northern margin. Pre-existing basement anisotropies or discontinuities are likely responsible for these important changes in structural grain. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Publication Year: 2005
Publication Date: 2005-07-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 10
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