Classification and Key Characteristics of VMS Deposits
Classification and Key Characteristics of VMS Deposits
Classification and Key Characteristics of VMS Deposits
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Type 4: Bimodal felsic-dominated• Setting: Ocean-continent arc, nascent arc rifting– Av. Size <strong>and</strong> Composition: 3.4 m.t., 1.0 Cu, 4.4 Zn, 1.1Pb, 1.1 g/t Au, 56 g/t Ag– Geology: 35%pillowed tholeiitic to calc-alkaline <strong>and</strong>esite, Felsic subvolc.intrusions, not prominent– Ore: Massive sulfides bulbous to tabular, pyritic, As, Sb,Sn variable; some Au-rich, local (late?) high-S zones;limited Cu-stringer zones.– Pipe alteration: pronounced, silicification <strong>and</strong> sericitedominant, zoned Fe -Mg chlorite core, sericite rim– Semiconformable: Lower albitic, upper K-spar rich, Nadepleted,uppermost zoned (Fe) carbonate– Examples: Kuroko, Skellefte, Sturgeon Lake, Buchans,Buttle Lake
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