PYRRHOTITE TYPOMORPHISM OF THE CHYORTOVO KORYTO GOLD ORE DEPOSIT

E. A. Sinkina, I. V. Kucherenko, R. Yu. Gavrilov

Insti tute of Natural Resources of the Tomsk Polytechnic University, Tomsk, Russia

The paper presents the results of analysing chemical composition, microhardness, and domain structure of pyrrhotite produced from the central part of the Chyortovo Koryto deposit ore body. It was established that the pyrrhotites of three generations are characterised by stable chemical composition (Fe 59.88…62.86% wt., S 36.58…39.79% wt.). Nickel (0.00…1.44% wt.) and copper (0.00…0.34% wt.) were identified as inclusions. The correlations of monoclinal and hexagonal modifications in the pyrrhotites of three generations vary. The amount of monoclinal modification increases from the early to the late generation, which is proved by the domain structures of pyrrhotite. The early-generation pyrrhotite I is characterised by feeble domain structures, and the late-generati on pyrrhotite III by strongly marked ones. The microhardness of pyrrhotites varies within 210.239…409.116 kgf/mm2. The early-generati on pyrrhotite is marked by prevailing low hardness, the lategeneration one by high hardness, which is due to different correlation of modifications. The study indicated that pyrrhotites I, II, and III are represented by two modifications—hexagonal and monoclinal – that vary in typomorphic properties: their chemical compositi on, domain structure, and microhardness.

Key words: gold ore deposit, pyrrhotite, hexagonal, monoclinal, microhardness, domain structures.

DOI 10.20403/2078-0575-2017-1-58-65 

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