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FAULT CONTROL OF THE CHICKASAW BLUFF/BIG CREEK LINEAMENT.

FAULT CONTROL OF THE CHICKASAW BLUFF/BIG CREEK LINEAMENT. Randel Tom Cox, Roy Van Arsdale, and James Harris, The University of Memphis, Memphis, Tennessee (RTC, RVA), and Millsaps College, Jackson, Mississippi (JH). The Chickasaw Bluff/Big Creek lineament (extending [sim]N45E from Arkansas into Tennessee) has been long suspected to be a fault of the seismogenic Reelfoot rift. Our geomorphic analysis of drainage basins suggests it indeed follows a boundary between tilting crustal blocks. Prompted by these results we acquired two reflection s-wave profiles across the lineament at prominent west-facing scarps at Porter Gap and Union City, Tennessee. At Porter Gap, where the lineament is the Chickasaw Bluffs, reflectors at 100--200 m depth dip west beneath the bluff face, and a steep reverse fault underlies the base of the bluff. Similarly, at Union City west-dipping reflectors beneath the scarp face appear truncated on the west near the base of the scarp, and auger data suggest a fault. Interestingly, structural rel ief at Porter Gap is higher on the east (consistent with topography), but separation on the fault is up-to-the-west. Thus, structure has been inverted during late Tertiary or Quaternary time.
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Author:LARSEN, DANIEL
Publication:Journal of the Tennessee Academy of Science
Article Type:Brief Article
Geographic Code:1U6TN
Date:Jan 1, 2000
Words:190
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