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《Geoscience》 2014-01
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Fluid Inclusions and S,Pb,C Isotope Geochemistry of Pb-Zn Deposits Hosted by Lower Cambrian in Western Hunan-Eastern Guizhou Area

CAI Ying-xiong;YANG Hong-mei;DUAN Rui-chun;LU Shan-song;ZHANG Li-guo;LIU Chong-peng;QIU Xiao-fei;Isotopic Geochemistry Laboratory,Wuhan Center of Geological Survey;  
The western Hunan-eastern Guizhou area is an important Pb-Zn polymetallic ore district,some of which hosted in the algal limestone of the Lower Cambrian Qingxudong Formation. In this study,fluid inclusions and S,Pb,C isotope compositions were studied for four typical Pb-Zn deposits( Limei,Shizishan,Xiunao and Pukouchang) hosted in the Qingxudong Formation. The results show the ore-forming fluid with low temperature and medium to high salinity. The δ34S values of sulfides are high. The δ13C and δ18OV-SMOWvalues of wall-rock and calcite show the same characteristic with the normal marine carbonate. The Pb isotope of the wall-rocks and ore have a little variation scope,showing the linear distribution in the207Pb /204Pb-206Pb /204Pb diagram. Our results indicated that ore-forming materials of the Pb-Zn deposits in the western Hunan-eastern Guizhou area mostly derived from the carbonate wall-rocks. Meanwhile,migrating fluid added Pb,Zn materials to the deposits as well. Pb,Zn and associated minerals were precipitated due to the changes of the physical and chemical conditions,resulted from mixing of two sources,indicating that the genesis type of our studied deposits is the Mississippi Valley-type( MVT) lead-zinc deposit.
【Fund】: 国土资源部公益性行业科研专项“湘西—鄂西典型铅锌矿床同位素定年方法与应用示范研究”(201011027-3);; 中国地质调查局项目“中南地区重大地质事件同位素年代学研究”(1212011121102)
【CateGory Index】: P618.4
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