Brittle to ductile transition due to large strains along the White Rock Thrust, Wind River Mountains, Wyoming

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doi: 10.1016/0191-8141(84)90083-X
Authors:Mitra, Gautam
Author Affiliations:Primary:
Univ. Rochester, Dep. Geol. Sci., Rochester, NY, United States
Volume Title:Planar and linear fabrics of deformed rocks; a selection of papers delivered at an international conference held at ETH
Volume Authors:Hancock, P. L., editors; Klaper, E. M.; Mancktelow, N. S.; Ramsay, John G.
Source:Journal of Structural Geology, 6(1-2), p.51-61; Planar and linear fabrics of deformed rocks, Zurich, Switzerland, Aug. 30-Sept. 2, 1982, P. L. Hancock, E. M. Klaper, N. S. Mancktelow and John G. Ramsay. Publisher: Pergamon, Oxford-New York, International. ISSN: 0191-8141
Publication Date:1984
Note:In English. 22 refs.; illus. incl. 4 plates, sect., geol. sketch map
Summary:The White Rock thrust in the Wind River Mountains of Wyoming is one such fault that developed at fairly shallow levels in the crust. Detailed study of grain-size variations and textures within the fault zone provide a framework for discussion of the mechanics of movement along the fault. Textural criteria are suggested for distinguishing between dominantly brittle and dominantly ductile deformation. A transition from brittle fracturing to ductile deformation is seen with increasing strain and resultant decrease in grain-size along the fault zone. Diffusional creep in the final stages of deformation leads to strain softening and may allow large strains to take place along narrow zones at low deviatoric stresses. This may be one way of obtaining large displacements along major faults at shallow levels in the crust.—Modified journal abstract. [M.E.J.]
Subjects:Basement; Cenozoic; Cretaceous; Deformation; Displacements; Ductility; Experimental studies; Faults; Field studies; Fractures; Grain size; Laramide Orogeny; Lower Tertiary; Mesozoic; Metamorphic rocks; Precambrian; Pressure solution; Reverse faults; Strain; Structural analysis; Structural geology; Tertiary; Textures; Thrust faults; Upper Cretaceous; North America; Rocky Mountains; U. S. Rocky Mountains; United States; Wind River Range; Wyoming; Diffusional creep; Grain size reduction; Rocky Mountain Cordilleras; White Rock Thrust; Wind River Thrust
Coordinates:N422000 N424500 W1083000 W1093000
Abstract Numbers:84M/4339
Record ID:1985013817
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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