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Geology, age, and tectonic setting of the Cretaceous Sliderock Mountain Volcano, Montana

Professional Paper 1602

By:
and

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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.

Additional Publication Details

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
Edition:
-
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.