Implications of Thrust and Detachment Faulting for the Structural Geology of the Thermo Hot Springs KGRA, Utah PDF Download
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Author: Ronald L. Bruhn
Publisher: Utah Geological Survey
ISBN:
Category : Geology, Structural
Languages : en
Pages : 27
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Book Description
This 23 page report is an initial investigation into the role that low-angle faulting may play in the formation of the Thermo Hot Springs Known Geothermal Area (KGRA), within the Sevier geothermal anomaly of southwestern Utah. The stratigraphy and structures exposed in the southern mineral mountains are used as an analog for studying the subsurface stratigraphy and the detachment fault within the Thermo Hot Springs KGRA.
Author: Ronald L. Bruhn
Publisher: Utah Geological Survey
ISBN:
Category : Geology, Structural
Languages : en
Pages : 27
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Book Description
This 23 page report is an initial investigation into the role that low-angle faulting may play in the formation of the Thermo Hot Springs Known Geothermal Area (KGRA), within the Sevier geothermal anomaly of southwestern Utah. The stratigraphy and structures exposed in the southern mineral mountains are used as an analog for studying the subsurface stratigraphy and the detachment fault within the Thermo Hot Springs KGRA.
Author: Ken McClay
Publisher: AAPG
ISBN: 0891813764
Category : Science
Languages : en
Pages : 404
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Book Description
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 16
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Book Description
Author: Stephanie Kay Riess
Publisher:
ISBN:
Category : Thrust faults (Geology)
Languages : en
Pages : 146
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Book Description
Author: Michael Gordon Prior
Publisher:
ISBN:
Category :
Languages : en
Pages : 352
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Book Description
The structural evolution of low-angle normal faults (detachment faults) has been an extensively debated topic since the initial recognition of these structures throughout the western U.S. Cordillera and their subsequent identification within extensional provinces across the globe. An improved understanding of how detachment faulting occurred at a variety of scales within continental extensional provinces can help refine structural models of how complex detachment fault systems evolved during progressive extensional deformation. This dissertation addresses the evolution of detachment fault systems using a thermochronometric approach that is coupled to hanging wall stratigraphic data in order to evaluate how the thermal history along detachment faults can evolution inform our understanding of the spatial, geometric, and temporal evolution of these fundamental extensional structures. Evaluating the accuracy of thermochronometrically-derived fault slip rates within large magnitude extensional systems has important implications for slip rate interpretations that can be significantly affected by various structural complexities within the footwall and hanging wall. Three new and distinct case studies are presented in order to understand the temporal and spatial development of low-angle normal fault systems and the resulting metamorphic core complexes that have developed within varied extensional settings. Chapter 1 utilizes (U-Th)/He thermochronometry to understand the significance of small-scale (100's to 1000 m scale) fault blocks within the Bullfrog Hills-Bare Mountain detachment fault system that accommodated transtensional deformation within the southern Walker Lane in southwestern Nevada. The timing of Miocene extensional exhumation was determined in the Bullfrog Hills and Bare Mountain Nevada as well as the effects of several main detachment faults, faults with multiple segments, small scale incisement and excisement detachment faults, and preexisting contractional structures on detachment fault evolution and the interpretation of thermochronometric data from within detachment fault domains. Chapter 2 focused on evaluating the larger scale (km to 10's of km) structural evolution of progressive detachment fault breakaways that developed along the Buckskin-Rawhide detachment fault system during large-magnitude (~40-50 km) Miocene displacement in the lower Colorado River extensional corridor of west-central Arizona. By coupling geothermochronometry data from within the pre-and synextensional sedimentary record preserved within the Lincoln Ranch hanging-wall basin, this study constrains the timing of a tertiary detachment fault breakaway and provides new insights on the timing of subaerial footwall exposure. Chapter 3 applies a high-density sampling strategy along an ~55 km long, slip-parallel transect within the Harquahala Mountains of west-central Arizona, one of the lesser studied examples of a classic Cordilleran metamorphic core complex in the lower Colorado River extensional corridor. Apatite and zircon (U-Th)/He ages throughout the Eagle Eye detachment fault footwall are combined with geothermochronometry data from sedimentary and basaltic hanging-wall rocks in order to determine the inception and duration of extension, fault displacement magnitude, fault slip rates, fault geometry, and timing of subaerial footwall exposure along the Eagle Eye detachment fault. New results are used to evaluate the structural evolution of the regionally correlative lower Colorado River extensional corridor detachment fault system at the southern extent of the Whipple tilt domain, which has important implications for the coherent behavior of regionally extensive continental detachment fault systems.
Author: Russell L. Wheeler
Publisher:
ISBN:
Category : Faults (Geology)
Languages : en
Pages : 54
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Book Description
Descriptions, with supporting evidence, of segment boundaries as they are expressed in gravity, aeromagnetic, seismological, fault-geometric, topographic, and structural data.
Author: Kenneth L. Cook
Publisher:
ISBN:
Category : Gravity
Languages : en
Pages : 112
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Book Description
Author: Thomas D. Fassio
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 114
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Book Description
Author: William Joseph Michael Chandonia
Publisher:
ISBN:
Category :
Languages : en
Pages : 105
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Book Description
"Deformation processes leading to formation and abandonment of 'triangle zones' along the leading edge of the Sevier fold and thrust belt are investigated near Kanarraville, Utah through construction of a detailed geologic map and cross-section along Spring Creek. Here the eastern limb of the Kanarra fold, a Sevier structure, is well exposed along the Hurricane Cliffs due to uplift and erosion of the footwall of the Hurricane Fault. The east-verging Kanarra fold changes from upright to overturned within Spring Creek. Within the fold limb, parasitic folds, minor thrust faults, and duplex structures result in local tectonic overthickening of units and demonstrate overall east-directed tectonic transport. Results from construction of the geologic cross-section indicate the Kanarra fold is a fault propagation fold forming above a blind thrust ramp - the 'Kanarra thrust'. In addition, the Taylor Creek thrust system, a system of west-directed thrust faults (backthrusts) as previously mapped along strike to the south, is inferred to be folded and overturned within the line of section. A combination of east-directed fault-related folding, the presence of a west-directed major backthrust, and the beginnings of tectonic overthickening, represent basic structural elements of a nascent 'triangle zone'. This triangle zone appears to have been abandoned prior to becoming fully developed. Merging of the Kanarra thrust and the folded Taylor Creek backthrust creates an effective west-dipping ramp that circumvented development of the triangle zone by enabling the Kanarra thrust to continue to cut up section through the Navajo Sandstone (Jn). These results suggest triangle zones may be less likely to fully develop in association with fault-propagation folds in comparison to fault bend folds"--Abstract, page iii.
Author: David William Szymanski
Publisher:
ISBN:
Category : Faults (Geology)
Languages : en
Pages : 218
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Book Description
