Hydrothermal Alteration, Virginia Range, Nevada

ID 2205

The Virginia Range southeast of Reno is composed of a thick section (up to 11,000 feet) of Tertiary volcanic rocks. This photograph shows tilted and altered volcanic rocks overlain by relatively unaltered basaltic andesites. Structurally, this block of west-dipping volcanic rocks was tilted and rotated during movement on east-dipping normal faults (not shown). Hydrothermal fluids rich in sulfuric acid probably altered the volcanic rocks. The slopes above the outcrop are covered by a pinyon-juniper woodland. Photograph taken along highway 341.

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