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The AAPG/Datapages Combined Publications Database
Four Corners Geological Society
Abstract
Colluvium-Filled Fault Fissures in the Needles Fault Zone, Cataract Canyon, Utah
Abstract
Two exposures of the Needles fault zone in Cataract Canyon indicate that the opposing fault blocks have been pulled apart at deep structural levels and the resultant voids filled with colluvium. These exposures validate the McGill and Stromquist (1975, 1979) model of shallow evaporite flow beneath a brittle plate creating the Needles fault zone. Because one of the observed faults has experienced a later episode of reverse displacement, gravity sliding of the post-salt sediments toward the canyon on a decollement surface at the top of the salt in the manner proposed by Huntoon (1982) also appears to have taken place. Rotated horst blocks suggest that shallow evaporite flow was confined to a region within 2 miles east of the Colorado River. Unrotated horst blocks between grabens farther east appear to be due to later eastward propagation of a decollement surface.
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