Exhumation of the Inyo Mountains, California: Implications for the Timing of Extension along the Western Boundary of the Basin and Range Province and Distribution of Dextral Fault Slip Rates across the Eastern California Shear Zone

摘要: [1] New geologic mapping, tectonic geomorphologic, 10Be terrestrial cosmogenic nuclide, and (U-Th)/He zircon apatite thermochronometric data provide the first numerical constraints on late Cretaceous to Quaternary exhumation of Inyo Mountains vertical slip horizontal extension rates across eastern fault zone, California. The east-dipping zone bounds flank Mountains, a prominent geomorphic feature within western Basin Range Province California shear zone. thermochronometry yield age patterns range that are interpreted as indicating: (1) two episodes moderate rapid associated with Laramide deformation during Cretaceous/early Tertiary; (2) development slowly eroding surface prolonged period from early Eocene middle Miocene; (3) cooling, exhumation, initiation normal along accommodated by westward tilting block, at 15.6 Ma; (4) renewed 2.8 Ma. Fault continues today indicated scarps cut Pleistocene alluvial fan surfaces. second episode Ma also signals onset dextral Hunter Mountain fault, yielding Pliocene rate 3.3 ± 1.0 mm/a, where is years. Summing this estimated Owens Valley, Death Stateline faults yields net 9.3 + 2.2/–1.4 9.8 1.4/–1.0 mm/a.