Igneous activity in the Comstock District, Nevada

Eos, Transactions, American Geophysical Union



The oldest igneous rocks in the Comstock District are amphibolites probably derived from basalts and of Triassic age. These are intruded by pre‐Tertiary quartz monzonlte and by granodiorite of Sierran facies, the latter not being exposed on the surface but found on mine‐dumps. Igneous activity recorded mainly in volcanic rocks was almost continuous throughout the Tertiary. Its products, in order of age, were as follows: Eocene—Rhyolitic flows aggregating a few hundred feet in thickness: One intrusive plug of rhyolite occurs. Eocene or Miocene—Hornblende‐auglte andesite intrusive into the rhyolite, type locality American Ravine. ©1938. American Geophysical Union. All Rights Reserved.

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Publication type Article
Publication Subtype Journal Article
Title Igneous activity in the Comstock District, Nevada
Series title Eos, Transactions, American Geophysical Union
DOI 10.1029/TR019i001p00262-1
Volume 19
Issue 1
Year Published 1938
Language English
Publisher American Geophysical Union
Description 1 p.
First page 262
Last page 262
Country United States
State Nevada
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