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Sources and Thermo-Chemical Sulfate Reduction for Reduced Sulfur in the Hydrothermal Fluids, Southeastern SYG Pb-Zn Metallogenic Province, SW China TEXT SIZE: A A A

Located on the western Yangtze Block, the Sichuan ()-Yunnan (M)-Guizhou (SYG) Pb-Zn metallogenic province has been a major source of base metals for China. In the southeastern SYG province, structures are well developed and strictly control about 100 Pb-Zn deposits. Almost all the deposits are hosted in Devonian to Permian carbonate rocks. Lead-zinc ores occur either as veinlets or disseminations in dolomitic rocks with massive and disseminated textures. Ore minerals are composed of pyrite, sphalerite and galena, and gangue minerals are calcite and dolomite. Sulfide minerals from four typical Pb-Zn deposits are analyzed for sulfur isotope compositions to trace the origin and evolution of hydrothermal fluids. The results show that delta S-34 values of sulfide minerals range from +3.50%0 to +20.26%0, with a broad peak in +10%0 to +16%0, unlike mantle-derived sulfur (0 +/- 3%0). However, the mean delta S-34 sulfide and delta(83)Ssfluids values are similar to that of sulfate-bearing evaporites in the host rocks (gypsum: similar to+15%0 and barite: +22%0 to +28%0) and Cambrian to Permian seawater sulfate (+15%0 to +35%0). This suggests that reduced sulfur in hydrothermal fluids was likely derived from evaporates in the host rocks by thermo-chemical sulfate reduction (TSR). Calculated delta S-34 Sigma S-fluid, values of the Shanshulin (), Qingshan (*LW, Shaojiwan (ffX/4) and Tianqiao () Pb-Zn deposits are +21.59%0, +18.33%0, +11.43%0 and +10.62%0, respectively, indicating sulfur-bearing hydrothermal fluids may be evolved from the Shanshulin to Qingshan and then the Shaojiwan to Tianqiao deposition sites along the Yadu ()-Ziyun lithospheric fracture in the southeastern SYG province.

Publication name

 JOURNAL OF EARTH SCIENCE  Volume: 24   Issue: 5   Pages: 759-771 Published: OCT 2013

Author(s)

 Zhou, Jiaxi; Huang, Zhilong; Bao, Guangping; Gao, Jianguo

Corresponding author  

 ZHOU Jiaxi
 jarcyz@163.com 
 Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China.

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