The circle creek rhyolite, a volcanic complex in northern Elko county, Nevada

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Abstract

The Circle Creek Rhyolite is a multiple-source mass of fayalite-ferro-augite rhyolite, forming an extensive complex in northern Elko County, Nevada, with a diameter of about 8 miles and an exposed area of about 36 square miles. From the structure of the flow layering and the complex sequence of microbrecciation structures, it seems to be a relatively thick mass that rose passively through many fissures to flood a sag basin in the older rocks, which are as young as the early Pliocene Idavada Volcanics, a sequence of ignimbrites and tuffs. Chemical analyses, thin-sections, and X-ray diffractometer studies show that the Circle Creek Rhyolite is a two-feldspar rhyolite. The interrelations of the pyroxene phases are unusually complex. The Circle Creek is partly concealed by later tuffs, gravels, and olivine basalt and is cut by two sequences of high-angle faults of different ages.

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Additional publication details

Publication type Book chapter
Publication Subtype Book Chapter
Title The circle creek rhyolite, a volcanic complex in northern Elko county, Nevada
DOI 10.1130/MEM116-p69
Volume 116
Year Published 1968
Language English
Publisher Geological Society of America
Description 39 p.
Larger Work Type Book
Larger Work Subtype Monograph
Larger Work Title Studies in Volcanology
First page 69
Last page 106
Country United States
State Nevada
County Elko County
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