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Chapter 14: Effect of Cenozoic extension on Mesozoic thrust surfaces in the central and southern Funeral Mountains, Death Valley, California

By
Ibrahim Cemen
Ibrahim Cemen
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Lauren A. Wright
Lauren A. Wright
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Published:
January 01, 1990

The central and southern Funeral Mountains of the Death Valley region contain at least two structural relations that suggest reactivation of the Mesozoic thrust surfaces during Cenozoic extension. One is at the Bat Mountain area of the southern Funeral Mountains where the Bat Mountain fault, named by Denny and Drewes (1965), dips about 20° northwest and shows as much as 2,000 m normal dip-separation along its northern exposures. The fault loses this separation progressively southwestward and joins along its strike to the northwest-dipping Mesozoic Clery thrust, named by McAllister (1971). The thrust has as much as 1,600 m reverse dip-separation and dips about 30 to 40°. This geometry, together with a structural reconstruction through the Bat Mountain area, suggests that the Bat Mountain fault is a reactivated thrust surface. Since the Bat Mountain fault and the Clery thrust are essentially the same fault surface, we suggest that the name Clery-Bat Mountain fault be used for the entire length of the fault.

The other structural relation that suggests reactivation is in the Schwaub Peak area of the central Funeral Mountains where Schwaub Peak thrust and its associated faults extend across the Funeral Mountains. The northwest-trending Keane Wonder strike-slip fault divides the upper plate into an only slightly extended northeast part and a strongly extended southwest part, a geometry requiring reactivation along the thrust faults. An offset anticline in the area suggests a 5-km normal separation on the underly-ing Schwaub Peak thrust and associated faults.

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GSA Memoirs

Basin and Range Extensional Tectonics Near the Latitude of Las Vegas, Nevada

Brian P. Wernicke
Brian P. Wernicke
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Geological Society of America
Volume
176
ISBN print:
9780813711768
Publication date:
January 01, 1990

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