MVT Deposits
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MVT Deposits. (Mississippi Valley Type Deposits). MVT Ores. Sphalerite and Galena in brecciated, dolomitized limestone. Spalerite-galena-bearing breccia. Galena. Sphalerite. Distribution of MVT Deposits. Zn-Pb Reserves and Production by Deposit Type.

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MVT Deposits

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Mvt deposits

MVT Deposits

(Mississippi Valley Type Deposits)


Mvt deposits

MVT Ores

Sphalerite and Galena in brecciated, dolomitized limestone

Spalerite-galena-bearing breccia

Galena

Sphalerite


Mvt deposits

Distribution of MVT Deposits


Mvt deposits

Zn-Pb Reserves and Production by Deposit Type


Mvt deposits

Grade and Tonnage Data for MVT Deposits


Mvt deposits

The MVT Districts of the SE United States


Mvt deposits

Geological Setting of Pine Point


Mvt deposits

Pine Point Ore and Host Textures

Dolomitized Limestone

Breccia infilled by sulphides

Oil seeps

Sphalerite-galena ore


Mvt deposits

Cross-section through the Pine Point Deposit


Mvt deposits

Cartoon of the Robb Lake MVT Deposit, Yukon


Mvt deposits

Karst Formation


Mvt deposits

Fluid Inclusion Data

Th: 125 – 200 oC

Salinity : ~ 15wt% NaCl eq.

2-Phase Aqueous Inclusions

Oil-bearing aqueous inclusions

Asphaltene

Oil

Oil


Mvt deposits

Composition of MVT Fluids


Mvt deposits

Sulphur Isotopic Composition of MVT Deposits


Mvt deposits

Solubility of Sphalerite and Galena


Mvt deposits

Genetic Model for MVT Deposits

  • Oil and then brine released from clastic sedimentary basin

  • Dissolution of reefal limestone creates porosity (Karst)

  • Oil leaves residues in limestone

  • Basinal brine leaches Pb, Zn from sandstones, shales

  • Basinal brine transports metals to porous limestone reef;

  • dolomitizes limestone

  • Backreef brine transport sulphate to reef

  • Galena and sphalerite deposit as a result of mixing of

  • metalliferous brine with sulphate-bearing brine, reduced

  • by interaction with oil residues.

ZnCl+ + SO42- = ZnS + Cl- + 2O2

PbCl+ + SO42- = PbS + Cl- + 2O2


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