内蒙古甲乌拉铅锌银矿床构造地球化学研究与找矿预测

Tectonic geochemistry and prospecting prediction of Jiawula Pb-Zn-Ag deposit,Inner Mongolia

内蒙古甲乌拉铅锌银矿床是大型火山-次火山热液脉状铅锌银金属矿床,经多年的开采,矿山面临着深部找矿问题。本次研究通过对2号矿体、3号矿体、2-44号矿体构造地球化学研究,建立了各矿体银铅锌矿化元素组合特征及不同成矿阶段矿体元素组合特征。研究认为甲乌拉矿床成矿期分为3个阶段,其第一阶段元素组合为As、Sb、Pb、Zn、Ag、Cu、Cd;第二阶段为As、Sb、Pb、Zn、Ag、Cu、Au、Ga、Cd;第三阶为Pb、Ag、Cd。成矿元素水平分带及垂直分带特征表明热液的来源可能为构造的南西深部,在此基础上,建立矿区近矿晕(Pb、Zn、Cu、Ag)、前晕(As、Sb、Hg、B)、尾晕(Bi、Mo、Mn、Co、Ni)的构造地球化学找矿标志,在2号矿体深部圈定找矿靶区3处,为深部探矿工程部署提供依据,实现甲乌拉铅锌银矿找矿新突破。

The Jiawula Pb-Zn-Ag deposit in Inner Mongolia is a large volcano-subvolcanic hydrothermal vein pb-Zn-Ag deposit.Based on the study of structure geochemistry of No.2,3 and 2-44 orebodies,the characteristics of Ag-Pb-Zn mineralization elements and the characteristics of meta-elements of orebodies in different ore-forming stages were established in this study.The study shows that the metallogenic period of Jiawula deposit can be divided into three stages,and the element assemblages are As,Sb,Pb,Zn,Ag,Cu and Cd in the first stage.The second stage As,Sb,Pb,Zn,Ag,Cu,Au,Ga,Cd;The third order is Pb,Ag and Cd.The characteristics of horizontal and vertical zonation of ore-forming elements indicate that the hydrothermal source may be in the deep southwest of the structure.On this basis,the tectonic geochemical prospecting indicators of near ore halo(Pb,Zn,Cu,Ag),front halo(As,Sb,Hg,B)and tail halo(Bi,Mo,Mn,Co,Ni)are established,and three prospecting target areas are delineated at the depth of No.2 orebody.It provides the basis for the deep prospecting project deployment and realizes a new prospecting breakthrough in Jiawula PB-zn-Ag deposit.