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Title: Petrology of the quaternary volcanics of the Roosevelt KGRA, and adjoining area, Utah. Final report, Volume 1

Abstract

The Roosevelt KGRA (Known Geothermal Resource Aarea) located near Milford, Utah, is associated with a suite of quaternary silicic volcanics distributed for 15 km along the crest and western flank of the Mineral Mountains, a large tertiary granite batholith. The volcanics are high-silica rhyolites and occur as domes, flows and tuffs. Initial eruptions resulted in two flows of low viscosity, phenocryst-poor rhyolite. Later activity consisted of pyroclastic eruptions and the emplacement of at least 9 viscous domes. In addition to abundant glass the rhyolites contain alkali feldspar, plagioclase, biotite, iron-titanium oxides and small amounts of hornblende, allanite, apatite, zircon, sphene and topaz. Magmatic temperatures were about 700C and water fugacities ranged from 350 to 3450 bars. Based on water fugacity calculations it is concluded that there may have been one or more shallow magma chambers in the Mineral Range at depths of about 1.6 km.

Authors:
Publication Date:
Research Org.:
Utah Univ., Salt Lake City (USA). Dept. of Geology and Geophysics
Sponsoring Org.:
National Science Foundation, Arlington, VA (USA)
OSTI Identifier:
7308985
Report Number(s):
UU-76-1-Z; PB-261549
Resource Type:
Technical Report
Resource Relation:
Other Information: Report on Known Geothermal Resource Area (KGRA)
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; RHYOLITES; PETROLOGY; UTAH; VOLCANIC ROCKS; VOLCANIC REGIONS; ALBITE; ALLANITE; ANORTHOSITES; APATITES; BIOTITE; FELDSPARS; GLASS; HORNBLENDE; KGRA; LAVA; WATER; ZIRCON; ACTINIDE COMPOUNDS; AMPHIBOLE; GEOLOGY; HYDROGEN COMPOUNDS; IGNEOUS ROCKS; MICA; MINERALS; NORTH AMERICA; OXYGEN COMPOUNDS; RADIOACTIVE MATERIALS; RADIOACTIVE MINERALS; ROCKS; ROCKY MOUNTAIN REGION; SILICATES; SILICON COMPOUNDS; THORIUM COMPOUNDS; THORIUM MINERALS; THORIUM SILICATES; TRANSITION ELEMENT COMPOUNDS; USA; ZIRCONIUM COMPOUNDS; ZIRCONIUM SILICATES; Geothermal Legacy; 150201* - Geology & Hydrology of Geothermal Systems- USA- (-1989)

Citation Formats

Nash, W.P.. Petrology of the quaternary volcanics of the Roosevelt KGRA, and adjoining area, Utah. Final report, Volume 1. United States: N. p., 1976. Web. doi:10.2172/7308985.
Nash, W.P.. Petrology of the quaternary volcanics of the Roosevelt KGRA, and adjoining area, Utah. Final report, Volume 1. United States. doi:10.2172/7308985.
Nash, W.P.. Tue . "Petrology of the quaternary volcanics of the Roosevelt KGRA, and adjoining area, Utah. Final report, Volume 1". United States. doi:10.2172/7308985. https://www.osti.gov/servlets/purl/7308985.
@article{osti_7308985,
title = {Petrology of the quaternary volcanics of the Roosevelt KGRA, and adjoining area, Utah. Final report, Volume 1},
author = {Nash, W.P.},
abstractNote = {The Roosevelt KGRA (Known Geothermal Resource Aarea) located near Milford, Utah, is associated with a suite of quaternary silicic volcanics distributed for 15 km along the crest and western flank of the Mineral Mountains, a large tertiary granite batholith. The volcanics are high-silica rhyolites and occur as domes, flows and tuffs. Initial eruptions resulted in two flows of low viscosity, phenocryst-poor rhyolite. Later activity consisted of pyroclastic eruptions and the emplacement of at least 9 viscous domes. In addition to abundant glass the rhyolites contain alkali feldspar, plagioclase, biotite, iron-titanium oxides and small amounts of hornblende, allanite, apatite, zircon, sphene and topaz. Magmatic temperatures were about 700C and water fugacities ranged from 350 to 3450 bars. Based on water fugacity calculations it is concluded that there may have been one or more shallow magma chambers in the Mineral Range at depths of about 1.6 km.},
doi = {10.2172/7308985},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jun 01 00:00:00 EDT 1976},
month = {Tue Jun 01 00:00:00 EDT 1976}
}

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