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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



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




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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