Hydrothermal adularia at Bodie, Mono County, California
Technical Report
·
OSTI ID:6250495
Adularia occurs in gold- and silver-bearing quartz veins and in hydrothermally altered dacite host rocks of late Miocene age at the Bodie mining district, Mono County, California. Chemical analyses of vein adularia indicate a composition of 95 percent KAlSi/sub 3/O/sub 8/. Optical, physical, and x-ray crystallographic properties of the adularia are consistent with those of high sanidine. The adularia formed between 8.6 and 7.1 m.y. ago, late in the history of the Bodie Hills volcanic field, during a period of intense potassium-silicate hydrothermal alteration and gold-silver mineralization. Chemical and isotopic analyses of adularia and associated vein minerals, quartz and calcite, and delta /sup 18/O and delta D measurements of fluid inclusions in these minerals indicate that a K- and Rb-rich solution of meteoric origin was the agent of alteration. Temperature (approximately 250/sup 0/C), K/Rb ratio, and delta /sup 18/O of the solution probably remained constant during potassium metasomatism and precipitation of the adularia.
- Research Organization:
- California State Dept. of Conservation, San Francisco (USA). Div. of Oil and Gas
- OSTI ID:
- 6250495
- Report Number(s):
- USGS-OFR-78-942; ON: DE83902126
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
AGE ESTIMATION
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
CALIFORNIA
CENOZOIC ERA
CHEMICAL COMPOSITION
ELEMENTS
FEDERAL REGION IX
FELDSPARS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GOLD
HYDROTHERMAL ALTERATION
IGNEOUS ROCKS
INCLUSIONS
ISOTOPE DATING
ISOTOPE RATIO
METALS
MINERALS
NORTH AMERICA
ORTHOCLASE
OXYGEN COMPOUNDS
PETROGENESIS
POTASSIUM COMPOUNDS
POTASSIUM SILICATES
ROCKS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
TERTIARY PERIOD
TRANSITION ELEMENTS
USA
VOLCANIC ROCKS
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
AGE ESTIMATION
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
CALIFORNIA
CENOZOIC ERA
CHEMICAL COMPOSITION
ELEMENTS
FEDERAL REGION IX
FELDSPARS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GOLD
HYDROTHERMAL ALTERATION
IGNEOUS ROCKS
INCLUSIONS
ISOTOPE DATING
ISOTOPE RATIO
METALS
MINERALS
NORTH AMERICA
ORTHOCLASE
OXYGEN COMPOUNDS
PETROGENESIS
POTASSIUM COMPOUNDS
POTASSIUM SILICATES
ROCKS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
TERTIARY PERIOD
TRANSITION ELEMENTS
USA
VOLCANIC ROCKS