Abstract

Deep seismic-reflection data which were collected by COCORP in central Nevada at ∼40°N latitude reveal a horizontally laminated, reflective lower crust and an upper crust containing prominent moderately dipping reflections from Cenozoic lava flows, basin fill, normal faults, older thrust: faults, and Paleozoic sediments. Prominent Moho reflections are seen at depths of 31–35 km, in agreement with refraction-based Moho depths for this area. The strongly layered character of the lower crust is best developed near the mid-Miocene Northern Nevada rift, suggesting that Cenozoic magmatism and ductile extension have played an important role in the development of this fabric. East-dipping reflections beneath southern Grass Valley in Lander County may locally disrupt an otherwise continuous “reflection Moho.”

First Page Preview

First page PDF preview
You do not currently have access to this article.