New data on the composition of jordanite-geocronite Pb-Sb-As sulfosalts at the Berezitovoe deposit (Upper Amur Region, Russia)

摘要

New data on the composition of jordanite-geocronite Pb-Sb-As sulfosalts in the vein-disseminated gold ore at the Berezitovoe deposit were provided. Within the studied quartz-sulfide sample, some grains of Pb-Sb-As sulfosalts, uniform in composition and azonal, are drastically different from each other in As and Sb contents forming a quasi-continuous range of solid compounds from jordanite to geocronite. Jordanite-geocronite minerals at the Berezitovoe deposit (relative to the Darasun deposit) are characterized by a higher Pb concentration with a low polymetal total. It is assumed that such typomorphic features of the composition of Pb-Sb-As sulfosalts are indicative of specific formation conditions of gold mineralization in polymetallic ores at the Berezitovoe deposit.