Control by Precambrian Basement Structure on the Location of the Tensleep-Beaver Creek Fault, Bighorn Mountains, Wyoming

Hoppin, R. A.; Palmquist, John C.; Williams, Lyman O.

doi:10.1086/627055

Cited by 20 publications

(12 citation statements)

References 7 publications

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“…WNW-and NE-striking zones of potential basement weakness are also present across Wyoming ( Fig. 2; Sims et al, 2001), with the most significant being the North Owl Creek, Tensleep, North Granite Mountains, and Big Trails faults, all likely having Precambrian ancestries (Hoppin et al, 1965;Allison, 1986;Paylor and Yin, 1993;Ver Ploeg and Greer, 1997;Grace et al, 2006).…”

Section: Precambrian Deformations-previous Workmentioning

confidence: 99%

“…Limited Precambrian basement of the Wyoming Province is available for study and is only exposed in the cores of Laramide arches and uplifts; however, Precambrian fabric data from the Bighorn (Hoppin et al, 1965;Palmquist, 1967;Hudson, 1969), Wind River (Frost et al, 2000;Chamberlain et al, 2003), and Owl Creek (Paylor and Yin, 1993) Mountains allow for comparison of Precambrian fabrics in proximity to major Laramide structures of Wyoming along the three hypothesized directions of potential basement weakness. These include the Piney Creek and Wind River thrusts (NNW strike), the Tensleep and North Owl Creek faults (WNW strike), and the Big Trails fault (NE strike).…”

Section: Precambrian Fabricsmentioning

confidence: 99%

“…Tensleep fault zone. Fabric data from Hoppin et al (1965) for Precambrian gneiss exposed adjacent to the Tensleep fault in the central Bighorn Mountains were used for Figures 5A and 5B. Foliations (n = 55) have an average strike of N81W (99°) and are subparallel with the strike of the Tensleep fault at N75W (105°; Fig.…”

Section: Bighorn Mountainsmentioning

confidence: 99%

“…The Tensleep fault is an E-W-striking, high-angle fault that extends ~50 km across the Bighorn Mountains and into the southern part of the Bighorn Basin (Finn et al, 2010). The fault is interpreted as a Precambrian structure that was reactivated in the Phanerozoic (Hoppin et al, 1965;Allison, 1986). Allison (1986) indicated that the fault is dominantly a reverse fault with only minor sinistral slip, an interpretation supported by the work of Weil et al (2014), who found no widespread evidence for vertical-axis rotations on the fault, thus suggesting limited sinistral slip.…”

Section: Wnw Rectilinear Zonesmentioning

confidence: 99%

“…Using available geologic and structural data, this study presents a structural analysis of the Wyoming portion of the Wyoming Province (study area; Fig. 1) that shows evidence for structural inheritance during Laramide contraction (Hoppin, 1961;Hoppin et al, 1965;Allison, 1986;Paylor and Yin, 1993;Ver Ploeg and Greer, 1997;Frost et al, 2000Frost et al, , 2006aStone, 2002;Erslev and Koenig, 2009;Weil, 2015, 2017). This work is unique in that the data set for the study consists of assimilation and synthesis of voluminous amounts of previous and pertinent research conducted by others on Laramide orogenesis, including both published and unpublished disparate data sets.…”

Section: Introductionmentioning

confidence: 99%

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Structural inheritance and the role of basement anisotropies in the Laramide structural and tectonic evolution of the North American Cordilleran foreland, Wyoming

Bader

2018

Lithosphere

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The Laramide belt of the North American Cordillera is a thickskinned orogen that continues to garner attention due to many unresolved ambiguities, particularly in the subsurface. Recent seismic studies provide a better understanding of Laramide tectonism at deep crustal levels. However, mechanisms for deformation accommodation in the upper crust remain unclear. A structural/tectonic analysis of Precambrian fabrics and structural grain of basement-cored Laramide arches and uplifts in Wyoming using only previously collected data, along with a hypothesis on the potential role of these features in Laramide orogenesis, is presented. This work provides evidence for the presence of Neoarchean convergence zones dominantly directed from the SW-NE toward the Wyoming Province forming NNW anisotropies. In addition, regional compressional forces from convergence formed WNW-and NE-striking conjugate shears. Precambrian basement fabrics characterize all three directions of major anisotropy, and they likely have a complex history of deformation since the Precambrian, most recently, during the Laramide orogeny. This Precambrian deformation system was likely a fundamental tectonic control in Laramide arch/uplift formation in Wyoming. During the Laramide orogeny, reactivation of anisotropies occurred throughout Laramide contraction, forming somewhat symmetrical, but discrete zones of transpression, displaced along a SW-NE-directed Laramide deformational front. Reverse-left oblique-slip faults developed from reactivation of WNW fabrics and, where connected, acted as relay zones, facilitating major arch development along NNWstriking faults. Internal controls for Laramide orogenesis in the upper crust are likely related to these basement anisotropies, which may link the evolution of foreland arches at deeper crustal levels to surface structures.

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Section: Precambrian Deformations-previous Workmentioning

confidence: 99%

Section: Precambrian Fabricsmentioning

confidence: 99%

Section: Bighorn Mountainsmentioning

confidence: 99%

Section: Wnw Rectilinear Zonesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural inheritance and the role of basement anisotropies in the Laramide structural and tectonic evolution of the North American Cordilleran foreland, Wyoming

Bader

2018

Lithosphere

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Tectonic evolution of a Laramide transverse structural zone: Sweetwater Arch, south central Wyoming

2016

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Structural, anisotropy of magnetic susceptibility (AMS), and paleomagnetic data record patterns of layer‐parallel shortening (LPS), vertical‐axis rotation, and regional fault‐fold evolution across the Sweetwater Arch, a major west to WNW trending, basement‐cored Laramide uplift in Wyoming. The southern arch flank is bounded by a WNW striking reverse fault zone that imbricated basement and cover rocks, the northern flank is bounded by a west striking fault zone with a component of strike‐slip and NW trending en echelon folds, and the eastern plunge transitions into an area of multiple‐trending faults and folds. Synorogenic strata record major arch uplift from Maastrichtian to Early Eocene time, followed by arch collapse. LPS, with development of systematic minor fault sets and AMS lineations, preceded large‐scale folding. LPS directions, estimated from both minor fault and AMS data, were oriented WSW along the northern flank, subparallel to Laramide regional shortening, but were refracted to the SSW along the southern flank, and to the west along the eastern arch plunge. Additional minor faults developed along steep fold limbs during continued shortening, with directions remaining SSW along the southern flank but becoming more variable along the eastern plunge where an increasingly heterogeneous stress field developed as additional faults were activated along basement heterogeneities. Vertical‐axis rotation was limited along the arch flanks, whereas the eastern plunge underwent counterclockwise rotation. Deflections in shortening directions were partly related to basement heterogeneities, including weak supracrustal belts on the arch flanks, a strong granitic core, and local reactivation of Precambrian shear zones.

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Interpretation of Precambrian K-Ar biotite dates in the bighorn mountains, wyoming

Condie

Heimlich

1969

Earth and Planetary Science Letters

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Control by Precambrian Basement Structure on the Location of the Tensleep-Beaver Creek Fault, Bighorn Mountains, Wyoming

Cited by 20 publications

References 7 publications

Structural inheritance and the role of basement anisotropies in the Laramide structural and tectonic evolution of the North American Cordilleran foreland, Wyoming

Structural inheritance and the role of basement anisotropies in the Laramide structural and tectonic evolution of the North American Cordilleran foreland, Wyoming

Tectonic evolution of a Laramide transverse structural zone: Sweetwater Arch, south central Wyoming

Interpretation of Precambrian K-Ar biotite dates in the bighorn mountains, wyoming

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