因子分析法对内蒙古查巴奇地区水系沉积物地球化学分区的应用研究

利用R型因子分析方法对内蒙古查巴奇地区1∶5万水系沉积物数据资料进行分析,提取了具有代表性的8个因子,绘制了因子得分图及地球化学分区图,结果显示:地球化学分区结果与地质特征对应较好。As、Sb、Cu、Zn组合主要反映了林西组地层,其子区展布方向与林西组地层的NE走向一致,而Pb、Zn子区在光华组英安岩及安山岩、老龙头组变质岩和早侏罗世英云闪长岩中均有分布,总体呈NE向展布;Ag、W子区除在研究区北侧有相对较小面积的分布外,主要分布在研究区南部晚侏罗世二长花岗岩中,表明Ag、W类与该位置的花岗岩体密切相关。通过野外实际调查发现,一个Au矿点及一个Pb、Zn矿点分别位于As、Sb、Cu、Zn子区和Pb、Zn子区内。通过对研究区进行地球化学分区,明确了各类子区特定的地质地球化学意义及其相互关系,为勘查地球化学方法找矿提供有利信息。

Study of Applying Factor Analysis Method to the Geochemical Division in Stream Sediments in the Chabaqi Area of Inner Mongolia

The authors analyzed the 1∶50,000 stream sediments data in the Chabaqi area of Inner Mongolia with the R-mode factor analysis method,and eight representative factors were extracted from the data.The geochemical divisions have a close relationship with the geological bodies by making a study of the factor score map,the geochemical division map and the geologic map.The element combination of arsenic,stibium,copper and zinc is mainly related to the Linxi Formation,and the distributions of division are in accordance with those of the Linxi Formation.The lead and zinc divisions are mainly distributed in the andesite and dacite of the Guanghua Formation,metamorphic rocks of the Laolongtou Formation,and tonalite of Early Jurassic,they are mainly distributed in the NE direction.Besides smaller divisions are distributed in the north of the study area,divisions of silver and tungsten are mainly distributed in the Late Jurassic adamellite of the south study area,and the distributions show that elements of silver and tungsten have closed relation to the granite body.A gold ore occurrence was found in the arsenic,stibium,copper and zinc divisions,and a lead-zinc ore occurrence is located in the lead and zinc divisions during field practical investigation.By the study of geochemical division,we have known the geological-geochemical implications and their reciprocal relationships.The research method can provide some significant information for the geological survey.