Petrology of the quaternary volcanics of the Roosevelt KGRA, and adjoining area, Utah. Final report, Volume 1
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.
- Research Organization:
- Utah Univ., Salt Lake City (USA). Dept. of Geology and Geophysics
- Sponsoring Organization:
- National Science Foundation, Arlington, VA (USA)
- OSTI ID:
- 7308985
- Report Number(s):
- UU-76-1-Z; PB-261549
- Resource Relation:
- Other Information: Report on Known Geothermal Resource Area (KGRA)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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)