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- W100830701 abstract "In order to understand interactions between motion along thrusts and the associated style of deformation and strain distribution in their hangingwalls, geologic mapping and strain measurements were conducted in an excellently exposed thrust-related fold system in the Lewis thrust plate, northwestern Montana. This system consists of (1) an E-directed basal thrust (the Gunsight thrust) that has a flat-ramp geometry and a slip of about 3.5 km, (2) an E-verging asymmetric anticline with its nearly vertical forelimb truncated by the basal thrust from below, (3) a 4-km wide fold belt, the frontal fold complex, that lies directly in front of the E-verging anticline, (4) a W-directed bedding-parallel fault (the Mt. Thompson fault) that bounds the top of the frontal fold belt and separates it from the undeformed to broadly folded strata above, and (5) regionally developed, W-dipping spaced cleavage. Strain in the thrust-related fold system was determined by the preferred orientation of mica and chlorite grains. The direction and magnitude of the post-compaction strain varies from place to place. Strains in the forelimb of the hangingwall anticline imply bedding-parallel thinning at some localities and thickening at others. The inhomogeneity may be caused by the development of thrusts and folds. Strain inmore » the backlimb of the hangingwall anticline implies bedding-parallel stretching in the thrust transport direction. This could be the effect of bending as the E-verging anticline was tightened and transported across the basal thrust ramp. Strain measured next to the Gunsight thrust again indicates locally varying shortening and extension in the transport direction, perhaps in response to inhomogeneous friction on the fault or else to a history of alternating strain hardening and softening in the basal thrust zone.« less" @default.
- W100830701 created "2016-06-24" @default.
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- W100830701 date "1992-01-01" @default.
- W100830701 modified "2023-09-26" @default.
- W100830701 title "Structural evolution of a thrust-related fold system in the Lewis thrust plate, northwestern Montana" @default.
- W100830701 hasPublicationYear "1992" @default.
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