HYDROTHERMAL SULFIDE MINERALIZATION OF OC EANIC RIFTS

Three groups of hydrothermal mineralization were discovered in oceanic rifts: in sediment-starved and sedimented rifts acid in rift depressi ons with dense bottom-hugging brines. They differ in size and morpholo gy of deposits and their composition and properties. The main reason o f these differences is transformation of primary hydrothermal ore-bear ing fluid when it propagates from the zone of chemical element mobiliz ation tb bottom surface and near hydrothermal vent.