The paper presents the S isotopic composition of sulfdes from the Ak-Sug Au-Cu-porphyry deposit hosted by Early Proterozoic magmatic rocks. The S isotopic composition of sulfdes varies from +1.0 to +3.2 ‰: +2.5 to +3.2 ‰ for molybdenite-I, +1.0 to +3.1 ‰ for pyrite-III, -2.3 to -0.9 ‰ for chalcopyrite-III-V,-2.9 to -2.4 ‰, for chalcopyrite-VI and -1.0 ‰ for pyrite-V. The close-to-zero S isotopic ratios of sulfdes from the Ak-Sug deposit indicate magmatic (from -5 to +5 ‰) or mantle (from -3 to +3 ‰) S source typical of most Cu-porphyry deposits of the Pacifc Fire Ring.

Figures 5. Table 1. References 23.

Key words: sulfdes, sulfur isotopes, copper porphyry deposits, Tuva.

R.V. Kuzhuget, Tuvinian Institute for Exploration of Natural Resources SB RAS,
ul. Internatsionalnaya, 117a, Kyzyl, 667007 Russia; rkuzhuget@mail.ru

A.O. Mongush, Tuvan State University, ul. Lenina, 36, Kyzyl, 667000 Russia

N.N. Ankusheva, South-Urals Federal Research Center of Mineralogy and Geoecology UB RAS, Institute of Mineralogy, Miass, Chelyabinsk region, 456317 Russia

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