Geochemistry of silver in oxidized zone of sulfidic deposits |
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| Abstract: | We studied distribution of vein formations (from quartz veins and pegmatites of different types to migmatites) in three regions with well-developed metamorphic zonation, with a similar temperature range of metamorphism but a variable total pressure. We considered the tectonic position of the metamorphic belts, the geochemical features of the progressive stage of metamorphism, granitization, and the formation of the pegmatite veins. After analyzing the geological and geochemical data, and physicochemical parameters (T, Ptotal, Pstress, and Pfl), we conclude that change in pressure and the composition of the volatile components plays the principal role in the degree of development of particular types of pegmatites in the various facies series of metamorphism, and that the distribution of pegmatites of different types is determined by the relationships between the temperature of crystallization of the melts and that of the surrounding rocks. —Authors. |
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