哀牢山成矿带老王寨金矿床成矿流体来源——来自氩-氦-氖-氙同位素证据  

作　　者：邓碧平 刘琴 练晓矜 吴永忠 张耀 丁旭 

机构地区：[1]贵州水利水电职业技术学院,贵阳551416

出　　处：《科技创新与应用》2023年第25期107-110,共4页Technology Innovation and Application

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0.75 Ra,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,不可避免地混入地壳流体,有利于大量金与硫化物等沉淀形成矿床。The geochemical characteristics of rare gases in fluid inclusions of Laowangzhai gold deposit show that the average ratios of 40Ar/36Ar and 38Ar/36Ar are about 1400.0 and 0.20,which are correspondingly between the Earth atmosphere and MORB.The average ratio of 3He/4He is about 0.75 Ra,which is correspondingly between the crust and mantle.The average ratios of 20Ne/22Ne and 21Ne/22Ne are 11.6 and 0.04,which are close to the mantle.The average ratios of 129Xe/130Xe,132Xe/130Xe,134Xe/130Xe,and 136Xe/130Xe are about 2.2,2.6,6.8,and 6.6,respectively,which are correspondingly higher than the atmosphere and show excess.The study of noble gas isotope system reveals that the ore-forming fluids mainly come from the deep mantle,and the crustal fluids are inevitably mixed in the deep geological process,which is conducive to the precipitation of a large number of gold and sulfide 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 硫化物 

分 类 号：P611[天文地球—矿床学]