Fluid and melt inclusions in minerals from magmatic rocks and associated ores and metasomatites were studied. Based on the results obtained as well as on experimental data, possible evolution trends are considered for the phase composition of magmatogene fluids separating from granitoid and basic melts at different depths. Three types of fluids have been recognized according to their composition and phase state, which differ in metal contents: (1) homogeneous supercritical, (2) heterophase “oxidized” and “reduced”, and (3) “dry”, essentially gaseous. Heterophase fluids are shown to have the highest metal-bearing capacity; their ore element complex is determined by the geochemistry of the ore-magmatic system. The obtained composition data evidence different metal-bearing capacity of the gas and water-salt phases of magmatogene fluids. It is shown that the high metal-bearing capacity of these fluids are due to their heterophase state, the high extraction capacity of each their component, dynamics and high temperature of fluid separation from melts (>700 °C), and high concentrations of ore elements in the original ore-bearing melts.

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