Geology, age, and tectonic setting of the Cretaceous Sliderock Mountain Volcano, Montana
Professional Paper
1602
By: E. A. Du Bray and Stephen S. Harlan
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Abstract
The Sliderock Mountain stratovolcano, part of the Upper Cretaceous continental magmatic arc in southwestern Montana, consists of volcaniclastic strata and basaltic andesite lava flows. An intrusive complex represents the volcano's solidified magma chamber. Compositional diversity within components of the volcano appears to reflect evolution via about 50 percent fractional crystallization involving clinopyroxene and plagioclase. 40Ar/39Ar indicate that the volcano was active about 78?1 Ma.
Suggested Citation
Du Bray, E., Harlan, S.S., 1998, Geology, age, and tectonic setting of the Cretaceous Sliderock Mountain Volcano, Montana: U.S. Geological Survey Professional Paper 1602, 19 p., https://doi.org/10.3133/pp1602.
ISSN: 2330-7102 (online)
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Geology, age, and tectonic setting of the Cretaceous Sliderock Mountain Volcano, Montana |
| Series title | Professional Paper |
| Series number | 1602 |
| DOI | 10.3133/pp1602 |
| Year Published | 1998 |
| Language | ENGLISH |
| Publisher | U.S. Dept. of the Interior, U.S. Geological Survey ; For sale by U.S. Geological Survey, Information Services, |
| Description | 19 p. |