CARBONACEOUS SUBSTANCE OF THE SUKHOI LOG GOLD DEPOSIT (East Siberia)
E.A. Razvozzhaeva, V.K. Nemerov, A.M. Spiridonov, S.I. Prokopchuk
Institute of Geochemistry, Siberian Branch of the RAS, 1a ul. Favorskogo, Irkutsk, 664033, Russia
Keywords: Carbonaceous shale; insoluble carbonaceous substance; concentrate of insoluble carbonaceous substance
Pages: 371-377
Abstract
nsoluble carbonaceous substance (ICS) at the Sukhoi Log gold deposit has been studied following the scheme: source shales - concentrates - residual substance of rocks. Examination by electron microscopy, transmission electron microscopy with electron microdiffraction, thermography, and mass spectrometry revealed several morphogenetic ICS varieties: dot-drop-like, honeycomb, single graphite crystals, and spherical graphite crystals.
Study of source shales and concentrates has shown their similar carbon isotope compositions (δ13C av = 18.03-17.54 ‰). Residual carbonaceous substance is characterized by a heavy carbon isotope composition (δ13C av = 10 ‰). Its enrichment with heavy carbon isotope, as compared with the source rocks, calls for special geochemical studies. The ICS heterogeneity in the Sukhoi Log shales points to variations in the physicochemical settings of ore formation at the deposit.
|
