高原寒冷区地电化学方法寻找隐伏铜多金属矿研究——以青海尕大阪矿区为例

[摘 要] 为了尽快突破高原寒冷区寻找隐伏矿难题,选取青海尕大阪矿区开展地电化学方法找矿示范及预测研究。在测区内已知剖面开展示范研究,结果显示,在已知矿体上方集中测出了明显的地电提取Cu、Pb、Zn 等元素异常及土壤离子电导率异常。基于示范研究成果,在矿区东南部开展隐伏矿预测研究,并圈定有利找矿靶区4 处。通过本次研究可知,高原寒冷景观条件下地电化学有两个特征:隐伏矿的氧化溶解是有限的,电化学溶解则是主要的溶解类型;活动态离子在垂直方向的迁移能力大于水平方向。两个特征亦是地电化学方法在本区示矿效果明显的重要原因。

Application of the Geoelecto-chemical Method to Prospecting Hidden Copper-polymetallicOre in Cold Plateau Areas:A Case Study of the Gardaban Mine in Qinghai Province

Abstract:In order to solve difficulties in searching hidden deposits in cold plateau regions,the Gardaban mine of Qinghai Province was chosen for thesite to conduct geoelectro-chemical surveys and deposit prediction. The result shows that clear anomalies of elements Cu,Pb,and Zn and soil ionic conductivity were found directly above the known orebodies. Based on this result,a deposit prospect study was conducted in the southeast of the mine area,and 4 favorable targets were determined. In addition,this study indicates two distinguishing characteristics of geoelectro-chemistry in cold plateau regions:(1) oxidizing solution of the hidden ore is limited,and geochemical solution dominates;(2) transport ability of active ions in vertical direction is stronger than that in horizontal direction. Both of the characteristics are the principal reasons for the marked success of the geoelectro-chemical method in ore search in this region.