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Title:Tectonics of the Uinta Recess in the Sevier Fold-Thrust Belt, Utah
Author(s):Paulsen, Timothy Scott
Doctoral Committee Chair(s):S. Marshak
Department / Program:Geology
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Physical Geography
Abstract:Regional synthesis of stratigraphic data and study of thrust-belt analog models suggests that the map-view geometry of the Sevier fold-thrust belt was influenced during formation, at the site of the future U/C arch because the site marked an abrupt change in the thickness of the sedimentary basin in which the fold-thrust belt formed. Basin geometry, in turn, was affected by reactivation of a long-lived basement fault system. Abrupt thickening of sedimentary strata to the south of this fault zone led to the development of the CTZ, for thrust systems propagate further to the foreland where strata are thicker. Thinning of strata adjacent to the north flank of the basement fault zone similarly retarded foreland propagation of the thrust belt, but because the thinning was not so abrupt as on the south side, an ESE-verging low-angle thrust and fold system developed, rather than a tear. In sum, the Uinta recess reflects both variation in sedimentary basin thickness prior to the origin of the Sevier fold-thrust belt, and the affects of later (Laramide) uplift and Tertiary extension.
Issue Date:1997
Description:127 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1997.
Other Identifier(s):(MiAaPQ)AAI9717325
Date Available in IDEALS:2015-09-28
Date Deposited:1997

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