内蒙古达塞脱东区土壤地球化学异常特征及找矿效果

内蒙古达塞脱东区位于锡林浩特—东乌旗多金属成矿带东段,成矿地质条件有利,但地表基岩出露少,第四系大片覆盖,找矿难度大。土壤地球化学测量从西到东圈定出三个SN向异常带,依据元素组合特征和分带理论,指出Ⅰ号异常带和Ⅱ号异常带东侧异常处于矿体前缘晕,Ⅲ号异常带处于矿体中前部,Ⅱ号异常带西侧异常处于矿体尾晕,异常存在较明显的水平分带性,推测矿体剥蚀程度存在由浅到深的变化趋势,后期地表槽探和钻探已在Ⅰ、Ⅱ号异常带分别发现了2个银多金属矿体和1个铅锌矿化体,且矿（化）体赋存部位、展布方向、规模与化探异常吻合性很好,化探工作在该区取得了很好的找矿效果。

Soil geochemical anomaly characteristics in the east area of Dasaituo and its exploration effect

The east area of Dasaituo in Inner Mongolia is located in east section of Xilinhaote-Dongwuqi polymetallic mineralization zone with favorable ore-forming condition but less surface outcrop and largely overlaid by Quaternary system causing difficulty in ore prospecting.Soil geochemical exploration has outlined three S-N striking anomaly zones lying from west to east,based on element combination characteristics and zoning theory,signaling that east side of No.Ⅰand Ⅱ anomaly zone is in front halo of the orebody,with Ⅲ anomaly zone occurring in middle front of the orebody and west side of Ⅱ anomaly zone occurring in the end halo of orebody,forming clear horizontal zoning of the anomaly,and presuming a variation trend of ore erosion from shallow to deep.The following surface trough prospecting and drilling have already found two silver polymetallic orebodies and one lead and zinc orebody,and the occurrence,extension,scale of the ores is consistent with geochemical anomaly.Geochemical exploration in the area received good result in ore hunting