Typomorphism of Pyrite from the Ugakhan Gold Deposit (Baikal-Patom Highlands)

The results of studying the isotopic, geochemical, and TEDS properties of various generations of pyrite and pyrrhotite from the Ugakhan deposit, Bodaibo district of Irkutsk region, are presented. Differences in the composition of impurities are established. Early pyrites (py-I and py-II) are characterized by the presence of Ni, Co, Cr, and Au admixtures, the electronic type of conductivity, and values of delta S-3(4)similar to +5.6 parts per thousand; py-III is characterized by a decreased amount of Ni, Co, and Cr, and an increased amount of As, the hole type of conductivity, and delta S-3(4) from +8.6 to +9.1 parts per thousand. Post-ore py-IV and py-IVQ are characterized by the smallest admix- ture concentrations, the electronic type of conductivity, and isotopically lighter sulfur (delta S-3(4) <= +3.8 parts per thousand).