Keywords and Phrases
Iron Springs; Sevier; Three Peaks; Thrust fault
"The temporal and spatial distribution of strain associated with the Sevier Orogeny in western North America is significantly different in the southern end of the belt, at the latitude of Las Vegas, than further to the north at the latitude of Salt Lake City. Until this study, reasons for these differences were speculative as a lack of thrust kinematic data in the intervening region hindered along strike correlation across the belt. A crystallization age of 100.18 ± 14 0.04 Ma was determined for zircons extracted from a recently recognized ash fall tuff near the base of the synorogenic Iron Springs Formation at Three Peaks, Iron County, Utah. Field relationships and this age constrain movement on the Iron Springs thrust and the end of the sub-Cretaceous unconformity in the critical intervening area to latest Albian/earliest Cenomanian. Movement on the Iron Springs thrust and other Sevier thrusts at ~100 Ma is synchronous with a period of global plate reorganization and a high convergence rate for the Farallon Plate, which led to a Cordilleran arc flare-up event, and triggered widespread thrusting across the retroarc Sevier deformation belts. Based on these results, we suggest temporal and spatial variation along the strike of the orogenic belt are inherited from variation in the thickness of the rifted Precambrian craton"--Abstract, page iv.
Hogan, John Patrick
Wizevich, Michael C.
Geosciences and Geological and Petroleum Engineering
M.S. in Geology and Geophysics
Missouri University of Science and Technology
Journal article titles appearing in thesis/dissertation
- The role of tectonic inheritance, plate reorganization, and magma flare-ups in the evolution of the Sevier Orogeny
ix, 74 pages
© 2020 James Daniel Quick, All rights reserved.
Thesis - Open Access
Electronic OCLC #
Quick, J. Daniel, "The role of tectonic inheritance, plate-reorganization, and magma flare-ups in the evolution of the Sevier Orogeny" (2020). Masters Theses. 7969.