ПОЛІБАЗИТ ТА ПІРАРГІРИТ МУЖІЄВСЬКОГО РОДОВИЩА

Анотація

The Muzhievo epithermal gold–silver–base-metal deposit is situated in the
Intercarpathian volcanic belt, in the Beregovo explosive caldera. Here in sulphide
aggregates there are thin grains of pyrargyrite and polybasite, which form main silver ores
in the deposit. By mineralogical observations of spatial distribution of the sulphosalts and
geochemical investigations in the sulphide aggregates two types of silver ores have been
established: 1) rich ores, represented by polybasite and pyrargyrite grains in galena with
veinlets of polybasite with Ag sulphides and native silver sometimes; 2) poor ores,
represented by rare polybasite grains in galena. As a result of the mineral forming system
evolution during silicification of sulphide aggregates the rich ores have been changed by
the poor ones. These processes led to recrystallisation of the Ag-sulphosalt grains and
dissolution of polybasite veinlets and pyrargyrite in sulphide aggregates.