STRUCTURAL FRAMEWORK AND LATE OLIGOCENE PALEOTOPOGRAPHY OF THE PAH RAH RANGE, WESTERN NEVADA: IMPLICATIONS FOR ESTIMATING OFFSET ACROSS THE WARM SPRINGS VALLEY FAULT ZONE IN THE NORTHERN WALKER LANE
Typical of transtensional settings, the western PR is cut by a complex array of multiple, apparently kinematically linked fault sets, including NW- to NNW-striking oblique dextral-normal faults, NE-striking oblique sinistral faults, and NNE-striking normal faults. On the SW flank of the PR, the NW-striking dextral-normal faults generally dip steeply NE and accommodated 15-30o of SW tilting. Many of the NW-striking faults along the lower reaches of the PR may be splays of the WSF. In the north part of Warm Springs Valley (WSV), a broad WNW-trending syncline plunges moderately (~20o)west. The fold probably formed through a combination of drag, clockwise rotation, and local shortening induced by dextral motion on the WSF. The main strand of the WSF may be buried in WSV directly south of the fold.
The paleovalley margin in the western PR serves as a potential piercing-line with which to estimate slip across the WSF. A strikingly similar paleovalley margin is exposed at Dogskin Mt on the southwest side of the WSF. If correlative, this would imply ~20 km of dextral offset on the WSF. However, other correlations implying less offset are possible across the WSF and may be more likely considering the apparent termination of the WSF only 10 km SE of the study area.