CARBON AND OXYGEN ISOTOPY IN LARGE-VOLUME NONTRADITIONAL GOLD-ORE OCCURRENCES OF THE FEDOROVSKO-MAGYZY-KALTASSKAYA ZONE (KUZNETSK ALATAU)

A. B. Shepel, M. E. Gavrilenko

Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk

The first part of the paper was published in the previous issue of the journal. The second part provides the findings of isotope study of carbon in graphites and carbon and oxygen in carbonates of the Kedrovskoye, Pakhomovskoye, and Kaltasskoye gold-ore occurrences in the Fedorovsko-Magyzy-Kaltasskaya orecontrolling zone. The aim was to develop exploration criteria and to specify the genesis of mineralisation. The authors suggested a hypothesis on the mantle origin of carbon in graphite occurring in gold-bearing metasomatites, hydrothermalites, and graphitised marbelised limestones. It is estimated that during graphitisation, the carbon derived from intratelluric fluids that had extracted dispersed “light-isotopic” and concentrated “heavy-isotopic” carbon from mantle substrate. At different stages of mineralisation, these fluids supplied the Earth’s crust along the Kuznetsko-Altaysky deep fault with carbon in the form of СО2, Н2СО3, НСО3 -, СО3 -, СН4.

Key words: Kuznetsko-Altaysky deep fault, Tomsky ledge, Fedorovsko-Magyzy-Kaltasskaya zone, largevolume non-traditional Kedrovskoye gold-ore occurrence, gold-bearing metasomatites and hydrothermalites, carbonic matter, graphitization, carbon and oxygen isotopes.

DOI 10.20403/2078-0575-2016-4-41-52