Leadville, Colorado district: oxygen isotopic evidence for a magmatic-hydrothermal origin
Conference
·
· Geol. Soc. Am., Abstr. Programs; (United States)
OSTI ID:6595576
A magmatic-hydrothermal origin for much of the manto and vein complex at Leadville, Colorado, is indicated by 60 /sup 18/O//sup 16/O and D/H analyses of rocks and minerals. The ore-related samples around Breece Hill all interacted with a high-/sup 18/O and high-D fluid. Phyllically altered Tertiary porphyries equilibrated with fluids of delta/sup 18/O = +4.5 to +7.5 and deltaD = -53 to -70 permil (SMOW). Metal-rich quartz veins above, and vug quartz within manto ore, were deposited by fluids with delta/sup 18/O = +3.4 to +11.3. The host Leadville Dolomite shows high-/sup 18/O alteration adjacent to ore. Finally, silica-dolomite tubes surrounding mantos, possible conduits for spent ore fluids, transmitted fluids of delta/sup 18/O = +6.4 to +8.7. By contrast, early jasperoid and late golden barite formed from meteoric waters. Early white barite formed from a fluid of indeterminate origin. These data clearly show that a local meteoric-hydrothermal system was interrupted by a massive flux of high-/sup 18/O high-D fluid with the isotopic character of magmatic water.
- Research Organization:
- Noranda Exploration, Inc., Denver, CO (USA)
- OSTI ID:
- 6595576
- Report Number(s):
- CONF-8510489-
- Conference Information:
- Journal Name: Geol. Soc. Am., Abstr. Programs; (United States) Journal Volume: 17
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
580300 -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
580400* -- Geochemistry-- (-1989)
ALKALINE EARTH METAL COMPOUNDS
BARITE
BARIUM COMPOUNDS
BARIUM SULFATES
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMISTRY
COLORADO
FEDERAL REGION VIII
FLUIDS
GEOCHEMISTRY
GEOTHERMAL FLUIDS
GOLD ORES
HYDROTHERMAL ALTERATION
HYDROTHERMAL STAGE
ISOTOPE RATIO
ISOTOPES
LEAD ORES
MAGMATISM
MINERALOGY
MINERALS
NORTH AMERICA
ORES
ORIGIN
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
QUANTITATIVE CHEMICAL ANALYSIS
SULFATE MINERALS
SULFATES
SULFUR COMPOUNDS
USA
580300 -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
580400* -- Geochemistry-- (-1989)
ALKALINE EARTH METAL COMPOUNDS
BARITE
BARIUM COMPOUNDS
BARIUM SULFATES
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMISTRY
COLORADO
FEDERAL REGION VIII
FLUIDS
GEOCHEMISTRY
GEOTHERMAL FLUIDS
GOLD ORES
HYDROTHERMAL ALTERATION
HYDROTHERMAL STAGE
ISOTOPE RATIO
ISOTOPES
LEAD ORES
MAGMATISM
MINERALOGY
MINERALS
NORTH AMERICA
ORES
ORIGIN
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
QUANTITATIVE CHEMICAL ANALYSIS
SULFATE MINERALS
SULFATES
SULFUR COMPOUNDS
USA