Oxygen-isotope geochemistry of quaternary rhyolite from the Mineral Mountains, Utah, USA
Oxygen isotope analyses were made of phenocryst and glass separates from four Quaternary rhyolite flows and domes in the Mineral Mountains, southwest Utah. With the exception of biotite in all samples and alkali feldspar in the rhyolite domes, all minerals appear to be in close oxygen isotope exchange equilibrium. The geothermometry equations proposed by Bottinga and Javoy (1973) and Javoy (1977) for quartz, alkali feldspar and magnetite produce the best agreement with temperature results fom two-feldspar and iron-titanium oxide geothermometry for these rhyolites. If the rhyolites were generated by partial melting in the crust, their whole-rock (glass) delta/sup 18/O values (6.3 to 6.9 permil) are consistent with generation from I-type (Chappell and White, 1974, O'Neil and Chappell, 1977; O'Neil et. al., 1977) sources.
- Research Organization:
- Utah Univ., Salt Lake City (USA). Dept. of Geology and Geophysics
- DOE Contract Number:
- AC07-79ID12079
- OSTI ID:
- 5350286
- Report Number(s):
- DOE/ID/12079-61; ON: DE82019951
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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BIOTITE
CHALCOGENIDES
CHEMISTRY
EVEN-EVEN NUCLEI
FEDERAL REGION VIII
FELDSPARS
GEOCHEMISTRY
GEOTHERMOMETRY
Geothermal Legacy
IGNEOUS ROCKS
IRON COMPOUNDS
IRON ORES
IRON OXIDES
ISOTOPES
LIGHT NUCLEI
MAGNETITE
MICA
MINERALS
NORTH AMERICA
NUCLEI
ORES
OXIDE MINERALS
OXIDES
OXYGEN 18
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
QUARTZ
RHYOLITES
ROCKS
SILICATE MINERALS
SILICON COMPOUNDS
SILICON OXIDES
STABLE ISOTOPES
TRANSITION ELEMENT COMPOUNDS
USA
UTAH
VOLCANIC ROCKS