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UDC 553.411.064.32:550.41(571.150) GENESIS OF AU-SKARN DEPOSITS OF THE TOPOLNINSKOE ORE FIELD (GORNY ALTAI)
Five mineral associations are recognized in the ore field: quartz-pyrite-arsenopyrite-calcite, quartzmolybdenite-calcite; quartz-arsenopyrite-pyrite-calcite, quartz-polymetallic-epidot-amphibole-calcite and telluride-sulfide ones. Fluid inclusions in calcite and quartz grains from metasomatites of propylitic and beresitic formations accompanying the specified mineral associations were examined in order to determine the conditions of mineral precipitation. It was found out that two fluid brines, different from each other by salinity and metallogenic load, participated in mineralization. It is determined that calcitic veinlets with molybdenite were formed at 250–150 °C and salinity of 13–6 wt.% NaCl-equiv. Quartz-arsenopyrite-pyritecalcite association was formed at 310–150 °C and salinity of 19–11 wt.% NaCl-equiv. The quartz-chloritepolymetallic-epidot-amphibole-calcite association formed at 190–150 °C. The metasomatites are divided into two facies: medium temperature epidot-actinolite one with salinity of 18–8 wt.% NaCl-equiv. and low temperature calcite-chlorite one with salinity of 9-4.5 wt.% NaCl-equiv. Beresites were formed at 240–187 °C and salinity of 9-4.5 wt.% NaCl-equiv.
Key words: Au-skarn formation, microthermometry, fluid inclusion, gold, mineral association.
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