Classification and Key Characteristics of VMS Deposits

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Type 2: Mafic-Backarc (ophiolite)• Setting: Mature ocean-ocean backarc, oceanicspreading ridges– Av. Size and Composition: 2.7 m.t., 1.8 Cu, 0.84 Zn,0.02 Pb, 1.4 g/t Au, 11 g/t Ag– Geology: Tholeiitic: MORB to LILE and LREE-enriched, ocean island basalt– Ore: Massive sulfides bulbous pyritic, low As, Sb, Sn;prominent Cu-stringer zones.– Pipe alteration: pronounced, zoned Fe -Mg chloritecore, sericite+/- paragonite rim ; silicic veins– Semiconformable: Epidote-albite-actinolite, localsilicification; regular metal depletion– Examples: Cyprus, Oman, Lokken (Norway)
Ophiolite-hosted•Usually formed in matureoceanic backarcs•May be obducted oceanicspreading ridges•Productive areas haveplagiogranite in thesubvolcanic sequence•biggest deposits low instratigraphic section•Au-rich caps generallyoverlooked by early miners
Page 2 and 3: Contributors (Alphabetical)• D. A
Page 4 and 5: Sources of Information• Studies o
Page 6 and 7: VMS Model• What are the key geolo
Page 8 and 9: HydrothermalEscapePrecipitationSite
Page 11 and 12: Five VMS Lithotectonic Settings•1
Page 13: 2: VMS Deposits: Zinc-Lead-Rich Dep
Page 16 and 17: Excellent Oceanic BackarcPotential
Page 18 and 19: Median Metal Content (Millions of T
Page 20 and 21: Metal Correlation MatrixCu Pb Zn Au
Page 22 and 23: Bimodal mafic: Comparison of Subtyp
Page 24 and 25: Noranda Cross Section
Page 26 and 27: • Snow Lake- two major VMSepisode
Page 28 and 29: Typical Noranda-type Deposit•Sulf
Page 30 and 31: Sturgeon Lake District: Example of
Page 32 and 33: Sturgeon LakeBimodal mafic 1BPyrocl
Page 36: Type 3: Pelitic - Mafic Backarc (Be
Page 39: Type 4: Bimodal felsic-dominated•
Page 43 and 44: Type 5: Felsic siliciclastic hosted
Page 46 and 47: Geologyof theBrunswickDistrict
Page 48: Summary• Cu-rich deposits form in

Classification and Key Characteristics of VMS Deposits

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