ABSTRACT
This contribution presents results of studies of fluid regime of Sn-Ag ore-forming systems, and computer modeling of forming of silver parageneses in these systems. Computer modeling, based on using data of fluid inclusions studies in minerals of Ag-Sb and Ag-Pb deposits, indicates high Ag-bearing capacity of concentrated chloride solutions which are interpreted as the original fluids for Ag-Sb and Ag-Pb deposits. Main Ag species in these solutions are chloride complexes, which change under alteration of PTX-parameter of hydrothermal fluid (AgCl4 3-→AgCl3 2-→AgCl2 -). Different mineral parageneses of Ag deposits are formed owing to decrease of temperature and chlorine concentration during evolution of ore-forming process. Ag-Sb ore was deposited from low temperature (<200°C) high concentrated solutions, and Ag-Pb ore is formed from diluted solutions.
