Evolution of mineralizing brines in the east Tennessee Mississippi Valley-type ore field
- Univ. of Michingan, Ann Arbor (USA)
The east Tennessee Mississippi Valley-type (MVT) ore field contains barite-fluorite and sphalterite deposits in a continuous paleoaquifer consisting of breccia zones in the Upper Cambrian-Lower Ordovician Knox Group. Paragenetic observations and fluid inclusion compositions in these deposits indicate that the Knox paleoaquifer was invaded first by Ca-rich brines (Ca:Na about 1) that deposited fluorite and barite, and later by Na-Ca brines (Ca:Na = 0.1 to 0.5) that deposited sphalerite. Geologic relation sindicate that these brines were derived from the southeast, in the area of the Middle Ordovician Servier foreland shale basin, and that imposed by fluorite solubility indicate further that all original connate water in the Sevier basin was required to deposit the estimated flourite reserves of the ore field.Thus, the later, sphalerite-depositing brines represent recycled meteoric water from the Sevier basin or connate brines from underlying (Cambrian) shales.
- OSTI ID:
- 7000855
- Journal Information:
- Geology; (USA), Journal Name: Geology; (USA) Vol. 17:4; ISSN GLGYB; ISSN 0091-7613
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
580000* -- Geosciences
ALKALI METALS
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
AQUIFERS
BARITE
BARIUM COMPOUNDS
BARIUM SULFATES
BRINES
CALCIUM
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
CHEMISTRY
CONNATE WATER
ELEMENTS
FEDERAL REGION IV
FILTRATION
FLUORIDES
FLUORINE COMPOUNDS
FLUORITE
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
GROUND WATER
HALIDE MINERALS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INTERSTITIAL WATER
METALS
METEORIC WATER
MINERALIZATION
MINERALS
NORTH AMERICA
ORIGIN
OXYGEN COMPOUNDS
RECYCLING
SEPARATION PROCESSES
SODIUM
SPHALERITE
SULFATE MINERALS
SULFATES
SULFIDE MINERALS
SULFUR COMPOUNDS
TENNESSEE
USA
WATER
WATER CHEMISTRY