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The AAPG/Datapages Combined Publications Database
Oklahoma City Geological Society
Abstract
Structural Analysis of Portions of the Washita Valley Fault Zone, Arbuckle Mountains, Oklahoma
ABSTRACT
Secondary structures associated with the Washita Valley fault suggested that wrench fault movement was initiated in the early Pennsylvanian. The various structural and stratigraphic observations in the study areas include: en enchelon folds suggesting a left lateral sense of movement; synthetic fractures at an angle of approximately 10 degrees with respect to the trend of the Washita Valley fault; antithetic fractures at an angle of approximately 60 to 85 degrees; horizontal to near horizontal slickensides; and major thickness differences in the Hunton Group across the fault. These features are predicted by the wrench fault model proposed by Wilcox, Harding, and Seely (1973). Pennsylvanian left slip on the order of 10 to 40 miles (16 to 24 km) may have occurred along the Washita Valley fault.
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