Oxygen isotope, fluid inclusion, microprobe and petrographic studies of the Precambrian granites from the southern Wind River Range and the Granite Mountains, Central Wyoming, U. S. A. : constraints on origin, hydrothermal alteration and uranium genesis
The Granite Mountain is comprised of the granite of Long Creek Mountain and the volumetrically dominant granite of Lankin Dome. It is concluded from the whole-rock oxygen isotopic, mineralogical, chemical and strontium isotopic data that the unaltered granites in the Granite Mountains were probably derived from a uranium-enriched source with some peraluminous metasedimentary component which favoured the preconcentration of uranium and thorium, whereas the Louis Lake Batholith was formed by partial melting of igneous source materials that are not strongly enriched in uranium. /sup 18/O depletion of these altered granites indicates interaction with a low /sup 18/O fluid (probably meteoric water), thus preconditioning the rock for leaching of uranium from the granites during later events. ..delta..Quartz-feldspar isotopic fractionations in altered granites reveal that the hydrothermal alteration took place at approximately 363 +/- 50/sup 0/C. Fluid inclusion studies show that late state fluid formed at approximately 144 +/- 22/sup 0/C (107 measurements, 8 samples) and of moderate salinity of about 23 equivalent weight % NaCl (40 measurements, 8 samples) occurs within the altered units. These fluids may have been partly responsible for the uranium loss (up to 80%) in the Granite Mountains during the Cenozoic.
- Research Organization:
- Georgia State Univ., Atlanta (USA)
- OSTI ID:
- 5497473
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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58 GEOSCIENCES
URANIUM MINERALS
HYDROTHERMAL ALTERATION
ORIGIN
WYOMING
PETROGRAPHY
FELDSPARS
FLUIDS
GRANITES
ISOTOPE RATIO
LEACHING
METEORIC WATER
MINERALOGY
OXYGEN 16
OXYGEN 18
PETROGENESIS
PRECAMBRIAN ERA
QUARTZ
CHALCOGENIDES
DISSOLUTION
EVEN-EVEN NUCLEI
FEDERAL REGION VIII
GEOLOGIC AGES
GROUND WATER
HYDROGEN COMPOUNDS
IGNEOUS ROCKS
ISOTOPES
LIGHT NUCLEI
MATERIALS
MINERALS
NORTH AMERICA
NUCLEI
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PLUTONIC ROCKS
RADIOACTIVE MATERIALS
RADIOACTIVE MINERALS
ROCKS
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SILICON COMPOUNDS
SILICON OXIDES
STABLE ISOTOPES
USA
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580100 - Geology & Hydrology- (-1989)