Petrology, geochronology, and chemical evolution of the Twin Peaks Rhyolite Domes, Utah
Two distinct sequences of silicic volcanism at the Twin Peaks volcanic field, Millard County, Utah, spanned periods from 2.74 +- .10 to 2.54 +- .09 m.y. and 2.43 +- .08 to 2.35 +- .08 m.y., and produced a total exposed volume of 4 km/sup 3/ of rhyolites and volcanoclastics. Wet chemical, x-ray fluorescence, microprobe, atomic absorption, and neutron activation methods have been employed to obtain a wide range of chemical data on whole rock and mineral separate samples. Calculated distribution coefficients are comparable to previously published values for high silica rocks. Each sequence is characterized by a systematic trend from < 72% to > 76% SiO/sub 2/. Accompanying this increase in SiO/sub 2/ over time are increases in Rb, Y, Sb, Cs, U, Th, HREE and decreases in Mg, Co, Fe, Sr, Ba, and LREE. Decreases in temperature and fO/sub 2/ and an increase in fH/sub 2/O are also indicated. These trends are very similar to gradients observed in ash flow tuffs erupted instantaneously from compositionally zoned magma chambers. Chemical evolution at Twin Peaks was dominated by the same mechanism of liquid state differentiation which produce the compositional zonation in larger silicic magma chambers.
- Research Organization:
- Utah Univ., Salt Lake City (USA). Dept. of Geology and Geophysics
- DOE Contract Number:
- AC07-79ID12079
- OSTI ID:
- 5285924
- Report Number(s):
- DOE/ID/12079-4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
15 GEOTHERMAL ENERGY
ABSORPTION SPECTROSCOPY
ACTIVATION ANALYSIS
AGE ESTIMATION
ANORTHOSITES
BIOTITE
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMISTRY
COMPUTER CODES
D CODES
DISTRIBUTION FUNCTIONS
ELECTRON MICROPROBE ANALYSIS
FRACTIONATION
GABBROS
GEOCHEMISTRY
GEOLOGY
Geothermal Legacy
IGNEOUS ROCKS
IRON COMPOUNDS
IRON OXIDES
MAGMA
MICA
MICROANALYSIS
MINERALOGY
MINERALS
NONDESTRUCTIVE ANALYSIS
NORTH AMERICA
OXIDES
OXYGEN COMPOUNDS
PARTITION
PETROGENESIS
PETROGRAPHY
PLUTONIC ROCKS
PYROXENES
QUARTZ
RHYOLITES
ROCKS
ROCKY MOUNTAIN REGION
SEPARATION PROCESSES
SILICA
SILICATES
SILICON COMPOUNDS
SILICON OXIDES
SPECTROSCOPY
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRACE AMOUNTS
TRANSITION ELEMENT COMPOUNDS
USA
UTAH
VOLCANIC REGIONS
VOLCANIC ROCKS
X-RAY EMISSION ANALYSIS
X-RAY FLUORESCENCE ANALYSIS
ABSORPTION SPECTROSCOPY
ACTIVATION ANALYSIS
AGE ESTIMATION
ANORTHOSITES
BIOTITE
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMISTRY
COMPUTER CODES
D CODES
DISTRIBUTION FUNCTIONS
ELECTRON MICROPROBE ANALYSIS
FRACTIONATION
GABBROS
GEOCHEMISTRY
GEOLOGY
Geothermal Legacy
IGNEOUS ROCKS
IRON COMPOUNDS
IRON OXIDES
MAGMA
MICA
MICROANALYSIS
MINERALOGY
MINERALS
NONDESTRUCTIVE ANALYSIS
NORTH AMERICA
OXIDES
OXYGEN COMPOUNDS
PARTITION
PETROGENESIS
PETROGRAPHY
PLUTONIC ROCKS
PYROXENES
QUARTZ
RHYOLITES
ROCKS
ROCKY MOUNTAIN REGION
SEPARATION PROCESSES
SILICA
SILICATES
SILICON COMPOUNDS
SILICON OXIDES
SPECTROSCOPY
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRACE AMOUNTS
TRANSITION ELEMENT COMPOUNDS
USA
UTAH
VOLCANIC REGIONS
VOLCANIC ROCKS
X-RAY EMISSION ANALYSIS
X-RAY FLUORESCENCE ANALYSIS