Igneous activity in the Comstock District, Nevada
Eos, Transactions, American Geophysical Union
By: F. C. Calkins
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Abstract
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.
Study Area
| 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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