MINERAL AND GEOCHEMICAL FEATURES OF THE ARYSKANSKOYE GOLD-QUARTZ MINERALISATION IN BERESITES (WESTERN TUVA)

R. V. Kuzhuget 1, V. V. Zaykov 2, 3, N. N. Ankusheva 2, 3

1 Tuvinian Institute for Exploration of Natural Resources SB RAS, Kyzyl, Russia; 2 Institute of Mineralogy UB RAS, Miass, Russia; 3 South Ural State University Miass Branch Miass, Russia

The article discusses mineral and geochemical features and conditions of formation of producing mineral associations of the Aryskanskoye gold-quartz mineralisation located in beresitised sedimentary and magmatic rocks. There are two productive stages of the mineralisation: gold-sulphide-quartz and gold-telluride-sulphidequartz ones. The late gold-telluride-sulphide-quartz stage was identified for the first time. It is represented by the gold-telluride association with gold, petzite (Ag3AuTe2), hessite (Ag2Te), altaite (PbTe), Se-containing altaite, bismuth telluride (Bi2Te3), and buckhornite (AuPb2BiTe2S3). The gold is native, as well as petzites and buckhornites (complex Au chalcogenide). It was established that the ores of the Aryskanskoye mineralisation were formed at a temperature of 340–128°C (the early gold-sulphide-quartz stage at 340–208°С, the late goldtelluride-sulphide-quartz stage at 128–280°С).

Key words: beresites, gold, tellurides, mineralogy, quartz, conditions of formation, fluid inclusions, Tuva.

DOI 10.20403/2078-0575-2017-1-98-110

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