蒙古国那仁陶勒盖金矿床原生晕特征及深部预测

PRIMARY HALO CHARACTERISTICS AND DEEP PROSPECTING PREDICTION OF NARAN TOLGOI GOLD DEPOSIT IN MONGOLIA

为预测和评价那仁陶勒盖金矿的成矿潜力,运用多元统计方法,结合地球化学各参数信息,对那仁陶勒盖金矿原生晕进行系统研究.结果显示:那仁陶勒盖金矿赋矿花岗闪长岩中Au、Ag、Bi等元素浓集克拉克值明显偏高,与那仁陶勒盖金成矿作用关系密切;矿石中Au与Sb、Cu、Pb、Ag、Hg、Zn、As、Bi等关系最为密切;矿体原生晕轴向分带序列出现尾晕元素W、Sn等与前缘晕元素As叠加的现象,同时(As+Sb)/(Bi+Mo)、100Sb/(Bi·Mo)等分带性指数出现转折,指示深部存在盲矿体.依据上述矿体原生晕特征,建立矿体叠加晕预测模型,预测盲矿体赋存位置在海拔710 m以下的岩体与地层接触带附近.

To predict and evaluate the metallogenic potential,the primary halo of Naran Tolgoi gold deposit is systematically studied by using multivariate statistical method combined with geochemical parameter information.The results show that the Clarke values of Au,Ag and Bi in the host rock granodiorite of the deposit are obviously high,which is closely related to the gold mineralization.Au is most closely correlated to Sb,Cu,Pb,Ag,Hg,Zn,As and Bi in the ores.There exists the superposition of rear halo elements(W and Sn)with front halo element(As)in the axial zoning sequence of primary halo.Besides,the turning of zonation indexes such as(As+Sb)/(Bi+Mo)and 100Sb/(Bi·Mo)indicates the existence of blind orebody in the deep.Based on the characteristics of primary halo,the prediction model of superimposed halo is established that the blind orebody is probably located near the contact zone between rock mass and strata below 710 m altitude.