内蒙古大石磨东预查区土壤地球化学特征及成矿预测

内蒙古大石磨东预查区位于蒙古—兴安造山带东段的额尔古纳地块中部,区域具有良好的斑岩型、浅成低温热液型矿床的成矿潜力。为了分析预查区成矿地质及地球化学条件,采用200m×20m的网度对预查区进行土壤地球化学测量工作,根据测试结果,运用聚类分析和因子分析方法,显示Au、Ag、Cu、Pb、Zn元素相对富集成矿的可能性较高;并通过计算各元素背景值和异常下限值,共圈定单元素异常70处,其中Ag异常6处,Cu异常10处,Zn异常10处,Pb异常6处。结合地质条件及元素异常特征,初步划分出找矿靶区5处,其中Ⅰ级靶区3处和Ⅱ级靶区2处。

The soil geochemical characteristics and metallogenic prognosis in Dashimodong study area, Inner Mongolia

The Dashimodong area is located in the Erguna Block,which belongs to the eastern segment of Xing'an-Mongolia Orogenic Belt.Regionally,the area is potential for the porphyry and epithermal deposit prospecting.Geochemical soil survey at 200 m × 20 m grid was conducted in the study area to analyze metallogenic and geological and geochemical conditions.The results were analyzed with cluster analysis and factor analysis method showing high possibility of metallogenic process of Au,Ag,Cu,Pb,Zn.According to calculation of the background value and anomaly threshold of each element 70 single element anomalies are delineated.Combined with geological conditions and the anomaly characteristics we extracted 5 prospecting targets of which 1 is target Ⅰ and 3 are target Ⅱ.