A preliminary study of the formation mechanism of the geoelectric chemistry anomaly
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摘要: 一直以来,人们都倾向认为地电化学方法取得的异常是由其吸附的金属离子引起,文中通过多个矿区地电化学试验发现,电提取微量元素异常往往与Fe、Al等常量元素异常高度一致,而Fe、Al等常量元素是组成粘土矿物的主要成分. 进一步对地电化学泡塑样品开展扫描电镜观测,发现电提取后泡塑载体样品中存在大量的大小从数微米至数十微米的粘土矿物颗粒. 由此初步推断,当前所使用的地电化学方法取得的异常很大程度上是由土壤中存在的具有电活动性的极细粒粘土矿物颗粒引起,地电化学提取过程对这些粘土矿物颗粒具有选择性吸附.Abstract: People always tend to consider the metal ions adsorbed in geoelectric process as the formation mechanism of geoelectric chemistry ( CHIM) anomaly. In this paper, contrast between major ( Fe and Al) and trace elements' anomalies in several deposits was made. The result shows the high consistency between them. As we know, Fe , Al and other major elements are usually the main compo-sitions of clay minerals. In addition, a large number of clay mineral particles whose sizes are from a few microns to tens of microns were found in the geoelectric foam plastic carrier through SEM observation. It can be accordingly inferred that the anomaly of CHIM is caused by fine-grained clay mineral particles that exist in soil, and these particles have electric activity and can be adsorbed selectively by CHIM process.
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