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 3: Pelitic - Mafic Backarc (Besshi)• Setting: Mature ocean-ocean backarc– Av. Size <strong>and</strong> Composition: 4.7 m.t., 1.2 Cu, 1.6 Zn, 0.7Pb, 0.75 g/t Au, 19 g/t Ag– Geology: pelitic to semi-pelitic distal, minor siliciclasticsediments. Tholeiitic basalt, MORB to LILE <strong>and</strong> LREEenriched, ocean isl<strong>and</strong> basalt– Ore: Massive sulfides tabular, pyrite & pyrrhotite, lowAs, Sb, Sn; high Co (+/- Ni?), minor Cu-stringerzones.Some sulfidic sediments, chert, IF.– Pipe alteration: zoned Fe -Mg chlorite core, sericite;– Semiconformable: not well established– Examples: Besshi, Windy Craggy
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