Abstract
Two gold deposits (Kuoerzhenkuola and Buerkesidai) have been discovered, explored and mined in the Sawuershan district, Xinjiang, NW China. Gold mineralization at Kuoerzhenkuola deposit occurs within Carboniferous andesite and volcanic breccias. Gold mineralization at Buerkesidai deposit occurs within Carboniferous siltstones. δ34S‰ values of pyrite separates of ores and altered andesite from Kuoerzhenkuola deposit variy from 0.25‰ to 1.3‰ and 1.5‰ to 2.44‰, respectively. δ34S‰ values of pyrite separates of ores and altered albite porphyry from Buerkesidai deposit vary from 0.44‰ to 0.84‰ and 1.1‰ to 2.81‰, respectively. He isotope data from fluid inclusions in pyrites formed during mineralization stage of Kuoerzhenkuola and Buerkesidai gold deposits show that the 40Ar/36Ar and 3He/4He ratios of fluid inclusions are respectively in the range of 282–525 and 0.64–9.48 R/Ra, suggesting that mantle fluids may have played an important role in the ore-forming processes. On the basis of S, He and Ar isotope data, we conclude that the ore-forming materials may be derived from the mantle and the ore-forming fluid may be a mixture of mantle-derived fluid with the meteoric water.
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