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Calculating Thrust-Fault Displacement in the Ouachita Mountains Frontal Belt, Oklahoma
Analysis of the "bow and arrow" rule as applied to the Ouachita frontal belt of southeastern Oklahoma indicates that an estimated minimum thrust fault displacement of 72 mi (116 km) has occurred. Maximum displacement is estimated between 97 and 127 miles (156-204 km). These values correspond to balanced cross-sections in western Arkansas where regional shortening was estimated between 68-96 mi (110-155 km). The Ti Valley fault, interpreted as the dominant thrust in the Oklahoma Ouachitas, subdivides the Ouachita Mountains into a two-component thrust system: a trailing imbricate fan from the Choctaw fault to the Ti Valley fault; and a leading imbricate fan from the Ti Valley south. This is an important consideration when calculating total displacement.
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