Master of Science (MS)
First Committee Member
Wanda J. Taylor
Number of Pages
New geologic map data (1:24,000 scale), geometric analyses, and kinematic analyses in the vicinity of the Crescent Spring fault zone (CSFZ), an E-W-striking fault zone in eastern Nevada, allow the recognition of four distinct extensional episodes. The episodes are pre-volcanic (pre-27 Ma), syn-volcanic (∼27-18 Ma), Miocene (?) post-volcanic, and Miocene (?) - Pliocene or Quaternary post-volcanic extension. This extensional pattern, which is consistent with other fault studies along the broadly defined Timpahute lineament, has several important aspects. (1) Transverse faults of the CSFZ are normal faults that accommodated a distinct N-S extensional event. (2) The strain field within this part of the Great Basin reoriented at least twice during the Tertiary, from E-W extension to N-S extension and back to E-W extension. (3) The dominantly southdipping, transverse normal faults moved crustal material southward, which may explain N-S shortening during large-magnitude E-W extension at the latitude of Las Vegas. (4) The eastern part of the Timpahute lineament is a regional transfer fault system that accommodated changes in the magnitude, timing, location, and direction of extension.
Basin; Extension; Faults; Great Role Transfer; Transverse
University of Nevada, Las Vegas
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Bidgoli, Tandis S, "The role of transverse faults in Great Basin extension: Transfer faults or N-S extension?" (2005). UNLV Retrospective Theses & Dissertations. 1820.