Classification and Key Characteristics of VMS Deposits

•These are a “special case” of the bimodal-felsic-dominated class•There are two types•1:Unusual compositions: Boliden, Neves Corvo: possible direct magmatic input•High Hg, Sn, Te; unusual non-stratiform shapes, not high S•Unusually enriched in “high volatility “elements (Hg, Sb, As, S):•probable exceptionally high vapour-phase (boiling) systems•not really “high S” either!