Keywords and Phrases
Fault Propagation Fold; Fold And Thrust Belt; Frontal Margin; Kanarra Fold; Sevier; Triangle Zone
"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.
Hogan, John Patrick
Geosciences and Geological and Petroleum Engineering
M.S. in Geology and Geophysics
Missouri University of Science and Technology
viii, 105 pages
© 2017 William Joseph Michael Chandonia
Thesis - Open Access
Electronic OCLC #
Chandonia, William Joseph Michael, "Deformation processes at the leading edge of the sevier fold and thrust belt, southwest Utah" (2017). Masters Theses. 7634.