Sulfur isotopic composition of the Tianqiao Pb-Zn ore deposit,Northwest Guizhou Province,China:Implications for the source of sulfur in the ore-forming fluids  

作　　者：ZHOU Jiaxi HUANG Zhilong ZHOU Guofu LI Xiaobiao DING Wei BAO Guangping 

机构地区：[1]The State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China [2]The Graduate University, Chinese Academy of Seiences, Beijing 100049, China

出　　处：《Chinese Journal Of Geochemistry》2010年第3期301-306,共6页中国地球化学学报

基　　金：supported by the National Basic Research Program of China (No. 2007CB411402);the National Natural Science Foundation of China (Grant No. 40573036)

摘　　要：The Tianqiao Pb-Zn ore deposit of Guizhou Province, China, is located in the mid-east of the Sichuan-Yunnan-Guizhou Pb-Zn-Ag multi-metallic mineralization area, which is representative of the Pb-Zn ore de-posits in this area. It consists of three main orebodies, whose Pb+Zn reserves are more than 0.2 million ton. This paper analyzes the sulfur isotopic composition of these orebodies. The data show that the ore minerals (galena, sphalerite, pyrite) in these orebodies are enriched in heavy sulfur, with δ34SV-CDT values varying between 8.35‰ and 14.44‰, i.e. the δ34SV-CDT values of pyrite are between 12.81‰ and 14.44‰, the mean value is 13.40‰; the δ34SV-CDT values of sphalerite are range from 10.87‰ to 14.00‰, the mean value is 12.53‰; the δ34SV-CDT values of galena are range from 8.35‰ to 9.83‰, the mean value is 8.84‰, and they have the feature of δ34Spyrite>δ34Ssphalerite>δ34Sgalena, which indicates the sulfur isotope in ore-forming fluids has attained equilibrium. The δ34S V-CDT values of the deposit are close to those of sulfates from carbonate strata of different ages in the ore-field (15‰), which suggests that the sulfur in the ore-forming fluids should be derived from the thermo-chemical sulfate reduction of sulfates from the sedimentary strata.The Tianqiao Pb-Zn ore deposit of Guizhou Province, China, is located in the mid-east of the Sichuan-Yunnan-Guizhou Pb-Zn-Ag multi-metallic mineralization area, which is representative of the Pb-Zn ore de-posits in this area. It consists of three main orebodies, whose Pb＋Zn reserves are more than 0.2 million ton. This paper analyzes the sulfur isotopic composition of these orebodies. The data show that the ore minerals （galena, sphalerite, pyrite） in these orebodies are enriched in heavy sulfur, with δ^34V-CDT values varying between 8.35‰ and 14.44‰, i.e. the δ^34V-CDT values of pyrite are between 12.81‰ and 14.44‰, the mean value is 13.40‰; the δ^34V-CDT values of sphalerite are range from 10.87‰ to 14.00‰, the mean value is 12.53‰; the δ^34V-CDT values of galena are range from 8.35‰ to 9.83‰, the mean value is 8.84‰, and they have the feature of δ^34pyrite〉δ^34sphalerite〉δ^34galena, which indicates the sulfur isotope in ore-forming fluids has attained equilibrium. The δ^34 V-CDT values of the deposit are close to those of sulfates from carbonate strata of different ages in the ore-field （15‰）, which suggests that the sulfur in the ore-forming fluids should be derived from the thermo-chemical sulfate reduction of sulfates from the sedimentary strata.

关 键 词：硫同位素组成 成矿流体来源 铅锌矿 贵州省 天桥 中国 西北部 硫酸盐还原 

分 类 号：P597[天文地球—地球化学] X513[天文地球—地质学]