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MVT Deposits

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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  1. MVT Deposits (Mississippi Valley Type Deposits)

  2. MVT Ores Sphalerite and Galena in brecciated, dolomitized limestone Spalerite-galena-bearing breccia Galena Sphalerite

  3. Distribution of MVT Deposits

  4. Zn-Pb Reserves and Production by Deposit Type

  5. Grade and Tonnage Data for MVT Deposits

  6. The MVT Districts of the SE United States

  7. Geological Setting of Pine Point

  8. Pine Point Ore and Host Textures Dolomitized Limestone Breccia infilled by sulphides Oil seeps Sphalerite-galena ore

  9. Cross-section through the Pine Point Deposit

  10. Cartoon of the Robb Lake MVT Deposit, Yukon

  11. Karst Formation

  12. Fluid Inclusion Data Th: 125 – 200 oC Salinity : ~ 15wt% NaCl eq. 2-Phase Aqueous Inclusions Oil-bearing aqueous inclusions Asphaltene Oil Oil

  13. Composition of MVT Fluids

  14. Sulphur Isotopic Composition of MVT Deposits

  15. Solubility of Sphalerite and Galena

  16. 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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