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Mechanics of fold-and-thrust belts and accretionary wedges Cohesive Coulomb theoryA self-consistent theory for the mechanics of thin-skinned accretionary Coulomb wedges is developed and applied to the active fold-and-thrust belt of western Taiwan. The state of stress everywhere within a critical wedge is determined by solving the static equilibrium equations subject to the appropriate boundary conditions. The influence of wedge cohesion, which gives rise to a concave curvature of the critical topographic surface and affects the orientation of the principal stresses and Coulomb fracture within the wedge, is considered. The shape of the topographic surface and the angles at which thrust faults step up from the basal decollement in the Taiwanese belt is analyzed taking into account the extensive structural and fluid-pressure data available there. It is concluded that the gross geometry and structure of the Taiwan wedge are consistent with normal laboratory frictional and fracture strengths of sedimentary rocks.
Document ID
19850031796
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Dahlen, F. A.
(Princeton Univ. NJ, United States)
Suppe, J.
(Princeton University Princeton, NJ, United States)
Davis, D.
(Lamont-Doherty Geological Observatory, Palisades, NY; MIT, Cambridge MA, United States)
Date Acquired
August 12, 2013
Publication Date
November 10, 1984
Publication Information
Publication: Journal of Geophysical Research
Volume: 89
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
85A13947
Funding Number(s)
CONTRACT_GRANT: NAS5-27339
CONTRACT_GRANT: NSF EAR-81-21196
CONTRACT_GRANT: NSF EAR-81-21197
CONTRACT_GRANT: NSF EAR-78-12936
Distribution Limits
Public
Copyright
Other

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