Paragenetic Relationships between Pyrite, Carbon, and Gold at the Sukhoi Log Deposit and Typomorphism of the Pyrite Surface

摘要

The Sukhoi Log deposit is situated in the central Baikal-Patom Highland [1, 2] and hosted in carbonaceous terrigenous rocks of the Khomolkho Formation. The economic stringer-disseminated gold-sulfide ore is composed largely of pyrite, quartz, and Fe-Mg carbonates. Carbonaceous matter is dispersed throughout the rock mass and concentrates in interstices between minerals or along cleavage fractures. The bulk carbon content in host shale varies from 0.5 to 5.0 wt % (occasionally up to 7%). Its main percentage falls on insoluble carbonaceous matter (ICM, or kerogen) that occurs in finely dispersed form [3, 4].