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《Journal of Jilin University(Earth Science Edition)》 2011-01
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Characteristics of Fluid Inclusions in Jiama Copper-Pollymetallic Ore Deposit,Tibet and Its Geological Significance

LI Yong-sheng1,ZHAO Cai-sheng1,2,Lü Zhi-cheng2,YAN Guang-sheng3,ZHEN Shi-min1 1.Faculty of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China 2.Development and Research Center,China Geological Survey,Beijing 100037,China 3.China Geological Survey,Beijing 100037,China  
The recently discovered Jiama super large copper-polymetallic deposit is located in the middle section of Gangdese metallogenic belt,Tibet.Systematic studies including petrography,microthermometry,laser Raman microprobe and SEM/EDS were carried out on the primary fluid inclusions in metallogentic granite and major ore bodies.The analytical results show that dominant fluid inclusions from skarn ore related to metallogensis include liquid-rich,gas-rich two-phase and daughter-minerals bearing polyphase types.Homogenization temperatures of the fluid inclusions range from 225 ℃ to 500 ℃.The average of the salinities of ore-forming fluid is 36.2% NaCleq and the densities vary from 0.89 to 0.98 g/cm3.The ore-forming fluids belong to NaCl-H2O type characterized by high-moderate temperature,high salinity,low density and strong reduction.Besides H2O,the gas compositions are immiscible system rich in CH4,H2S,CO2 and N2 etc.The occurrence of organic matter,such as CH4,C2H4 and C3H6,suggests that the ore-forming materials were formed in a reduced environment.Based on estimation of mineralization pressure and the relationship between pressure and depth in fracture zones,the mineralization depth is considered to be at 2.2-8.3 km.The analytical results of hydrogen and oxygen isotopic elements show that ore-forming fluids are mainly derived from magmatic water mixed with meteoric water later.The coexistence of daughter-minerals bearing multi-phase inclusions and those liquid-and gas-rich inclusions with different filling degrees,together with their similar homogenization temperatures and much different salinities,indicates that ore-forming fluids had experienced boiling.
【Fund】: 全国危机矿山接替资源找矿项目(200699105);; 中国黄金集团西藏华泰龙矿业公司项目(E0804)
【CateGory Index】: P618.41
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