Styles of deformation and thrust interactions on the Paris, Laketown, and Crawford thrust faults, northern Utah
Conference
·
· Geological Society of America, Abstracts with Programs; (United States)
OSTI ID:5129188
- Utah State Univ., Logan, UT (United States). Dept. of Geology
Surface geology is combined with abundant industry seismic-reflection data in the central Bear River Range and Bear Lake Plateau to depict the form and interactions of the Paris-Willard, Laketown-Meade, and Crawford thrust faults. The Paris thrust loses displacement to the south, dying out into splays and a conical fold as displacement is transferred to the Willard thrust. West-southwest of Woodruff, Utah, splays of the Laketown-Meade and Woodruff thrust faults interfinger through extensive footwall imbrication and accommodate a major splay that trends northeast into the Crawford thrust fault, indicating a change in palinspastic thrust vectors. Reorientation of these vectors is possible due to the imbricate stack of thrusts acting as a pivot while simultaneously accommodating thrust-to-thrust displacement transfer. This thrust ramps lower Paleozoic rocks up to the base of the overlying Tertiary Wasatch Conglomerate. This relationship implies possible reactivation and incorporation of this older thrust into the Crawford thrust fault east of Bear Lake. The sharp bend in the surface trace of the Crawford normal fault southeast of Randolph, Utah reflects the separation of the Crawford thrust and this splay. Cross-sections indicate a major splay off the basal decollement in the Crawford thrust sheet that accommodated displacement during the transition from thrusting on the western thrust system to the structurally lower eastern thrust system. This thrust folds the Laketown-Meade thrust in the central Bear River Range and trends northeast where it forms a series of hanging-wall anticlines that have been extensively targeted for hydrocarbon exploration.
- OSTI ID:
- 5129188
- Report Number(s):
- CONF-9305259--
- Conference Information:
- Journal Name: Geological Society of America, Abstracts with Programs; (United States) Journal Volume: 25:5
- Country of Publication:
- United States
- Language:
- English
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