Detection and Mapping of Hydrothermally Altered Rocks in the Vicinity of the Comstock Lode, Virginia Range, Nevada, Using Enhanced Landsat Images

The Virginia Range, immediately southeast of Reno, Nev., consists mainly of flows, breccias, and tuffs of Miocene age. Most of these volcanic rocks are of intermediate composition; rhyodacite is the most common rock type. Basalt, rhyolite and rhyolite tuff, and tuffaceous sedimentary rocks of Miocene and Pliocene age also cover substantial areas in the range. Pre-Tertiary metasedimentary, metavolcanic, and granitic rocks are exposed in scattered inliers, mostly along the southern and eastern margins of the range. Several large areas and many small areas within the volcanic pile were subjected to hydrothermal alteration during and after the period of intermediate volcanic activity. Economic precious metal mineralization is spatially and temporally associated with the hydrothermal alteration in several areas. The most important deposit is the Comstock Lode, which produced 192 million troy ounces of silver and 8.3 million troy ounces of gold from epithermal veins (Bonham, 1969).

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Metadata Source

Additional Info

Field Value
Citation Date 1979-01-01T12:00:00

Harvest Information

Original ID 50ec3aefb656b70647f32e38bcc68431
Index Date 2015-07-01T21:47:46Z
Original Format ISO-USGIN
Original Version 1.2

Authors

Name Ashley, R.P.
Position missing
Organization U.S. Geological Survey
Email metadata@usgin.org
Name Goetz, A.F.H.
Position missing
Organization Jet Propulsion Laboratory
Email metadata@usgin.org
Name Rowan, L.C.
Position missing
Organization U.S. Geological Survey
Email metadata@usgin.org
Name Abrams, M.J.
Position missing
Organization Jet Propulsion Laboratory
Email metadata@usgin.org

Geographic Extent

North Bound 39.5
South Bound 39.25
East Bound -119.5
West Bound -119.75