THE NEOGENE VERDI BASIN RECORDS <2.0 – 2.5 MA DEXTRAL FAULTING WEST OF THE WALKER LANE NEAR RENO, NV
The post-depositional deformation of the Verdi Basin deposits demonstrates significant strike-slip, as well as extensional, motion since 2.6 (or 1.9?) Ma. Tilting (predominantly eastward) of the Neogene section pre-dates most of the faulting, and suggests that much of the initial deformation was extension accomplished by a west-dipping normal fault system farther east, probably along the west flank of the Virginia Range. Several sets of faults post-date most of the tilting; these include: NW-striking dextral, NE-striking sinistral, and N-striking normal-dextral oblique-slip faults. These faults are widely distributed throughout the Verdi Basin, and some (particularly the dextral and oblique-slip faults) have tens or hundreds of meters of slip. They accommodate both E-W extension and significant NW-directed dextral slip.
The sedimentary rocks of the Verdi Basin record faulting and basin initiation around 10.5 Ma, and a dramatic tectonic and paleogeographic change < 22.5 Ma. The latter included the initiation of extension as well as NW-striking dextral strike-slip motion west of the Walker Lane sensu stricto, in rocks that are part of the eastern edge of the Sierra Nevada block.