阿荣旗谢永贵家庭农场一带土壤化探的数学地质异常提取

Mathematical geology anomaly extraction for soil geochemistry in Xie Yong-gui family farm area of Arun Banner,Inner Mongolia

应用数学地质方法对阿荣旗谢永贵家庭农场一带1∶1万土壤化探数据进行了分析,得出该区异常主要受中下泥盆统泥鳅河组泥质板岩、沙质板岩与安山岩体接触带形成的矿化异常控制。研究区土壤地球化学R型聚类分析表明,10种微量元素可以分为3类:第一类为Cu、Ag、Au、As、Mo,第二类为Pb、Zn、Bi、Hg,还有一类为Sb。第一类反映了石英脉或蚀变岩型矿化的指示元素组合,第二类反映了中温的矿化元素组合。对研究区元素采用因子得分趋势面分析提取其反映局部异常变化的剩余异常,再对剩余异常进行多因子叠加法成图。在该区共圈定出4个异常靶区,以石英脉或蚀变岩型金矿化为主,是下一步重点的找矿区域。

Mathematical geology was employed to analyze the data obtained in 1 ： 10 000 soil geochemical survey in the Xie Yong-gui family farm in Arun Banner, Inner Mongolia. It is concluded that the anomalies are mainly con- trolled by mineralization along the contact zone between the argillite, sandy slate and the andesite rock body in the middle-bwer Devonian Niqiuhe Formation. Cluster analysis of the soil geochemical data obtained from the Xie Yong-gui family farm area shows that ten kinds of trace elements can be grouped into three categories, i.e., （1） Cu, Ag, Au, As and Mo; （2） Pb, Zn, Bi, Hg; （3） Sb. The first category reflects a combination of indica- tor elements of quartz-vein or altered rock-type mineralization, and the second category indicates the combination of medium-temperature ore-forming elements. Using element factor scores of trend surface analysis, the authors extracted anomalies in the Xie Yong-gui family farm area of Arun Banner and also extracted residual anomalies which reflected local anomaly changes. Then, the adding method was used to conduct mapping. Four anomaly target areas were delineated in this study, i.e.,and IV, which seem to be the key areas for the ex-ploration of quartz vein type and altered rock type gold deposits.