基于老王寨金矿成矿流体稀有气体同位素地球化学特征研究  

Geochemical Characteristcs of Noble Gas Isotopes Based on Ore-forming Fluids of Laowangzhai Gold Deposit

作　　者：邓碧平 练晓矜 刘琴 吴永忠 张耀 丁旭 DENG Bi-ping;LIAN Xiao-qin;LIU Qin;WU Yong-zhong;ZHANG Yao;DING Xu(Guizhou Vocational and Technical College of Water Resources and Hydropower,Guiyang 551416,China)

机构地区：[1]贵州水利水电职业技术学院,贵州贵阳551416

出　　处：《世界有色金属》2023年第16期83-85,共3页World Nonferrous Metals

摘　　要：老王寨金矿床流体包裹体中稀有气体同位素地球化学特征表明:40Ar/36Ar、38Ar/36Ar平均比值约为1400.0、0.20,相应地介于地球大气与MORB之间;3He/4He平均比值约为0.75Ra,相应地在地壳和地幔之间;20Ne/22Ne和21Ne/22Ne平均比值约为11.6、0.04,相应地接近地幔;129Xe/130Xe、132Xe/130Xe、134Xe/130Xe、136Xe/130Xe平均比值分别约为2.2、2.6、6.8、6.6,相应地高于大气而呈现过剩。稀有气体同位素系统研究揭示,成矿流体主要来自深部地幔,在深部地质过程中,不可避免地混入了地壳流体,有利于大量金与硫化物等沉淀形成矿床。Geochemical characteristics of noble gas isotopes in fluid inclusions of Laowangzhai gold deposit shows that average ratio of 40Ar/36Ar and 38Ar/36Ar is about 1400.0 and 0.20 which is between ratio of earth atmosphere and MORB,and average ratio of 3He/4He is about 0.75Ra which is between crustal characteristic value and mantle characteristic value,and average ratio of 20Ne/22Ne and 21Ne/22Ne is about 11.6 and 0.04 which is close to ratio of mantle,and average ratio of 129Xe/130Xe and 132Xe/130Xe and 134Xe/130Xe and 136Xe/130Xe is about 2.2 and 2.6 and 6.8 and 6.6 which presents overall excess characteristics relative to ratio of atmosphere.Systematic study of noble gas isotopes reveals that ore-forming fluids mainly come from deep mantle and are inevitably mixed with crustal fluids in deep geological process,which is beneficial to abundant gold and sulfides to precipitate and form deposits.

关 键 词：稀有气体同位素 老王寨金矿 成矿流体 地球化学特征 

分 类 号：P611[天文地球—矿床学]