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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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Presentation Transcript
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MVT Deposits

(Mississippi Valley Type Deposits)

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MVT Ores

Sphalerite and Galena in brecciated, dolomitized limestone

Spalerite-galena-bearing breccia

Galena

Sphalerite

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Pine Point Ore and Host Textures

Dolomitized Limestone

Breccia infilled by sulphides

Oil seeps

Sphalerite-galena ore

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Fluid Inclusion Data

Th: 125 – 200 oC

Salinity : ~ 15wt% NaCl eq.

2-Phase Aqueous Inclusions

Oil-bearing aqueous inclusions

Asphaltene

Oil

Oil

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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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