地电化学法在寻找隐伏铀矿中的应用———以诸广鹿井地区为例

鹿井地区是我国重要的花岗岩型铀矿产区之一，为了扩大我国资源储备，加大铀矿找矿深度，在该地区使用地电化学法进行了找矿预测研究。基于“由已知到未知”的原则，先在研究区南部书楼丘铀矿床进行了已知剖面的可行性试验研究，发现在已知矿体分布范围上方出现了清晰的地电提取异常，异常与矿体对应程度较高、示矿性较好，说明利用地电化学法在鹿井地区寻找隐伏铀矿是可行且有效的。通过在鹿井地区开展未知区地电提取测量，基于测量数据，利用元素变异系数图解对As、Co、Cu、Mo、Ni、Pb、Sb、Th、Ti、U、V、Zn共12种元素含量进行统计并分析其富集离散程度，结果表明：研究区内U元素具有较好的成矿潜力。通过聚类分析和因子分析，将12种元素划分为F1（Co-Ni-Cu-Pb-Zn-V-Ti）、F2（U-Th-Pb-V）、F3（Mo-As-Sb）3组元素组合并绘制衬度异常图，对元素组合异常的分布进行了分析，同时发现w(U)/w(Th)＞1/3的异常分布对寻找铀矿有重要的参考价值。根据元素组合的衬度异常套合情况并参考U单元素、w(U)/w(Th)值的异常平面分布特征，结合控矿与成矿地质条件及成矿潜力等因素，圈定出了3处找矿靶区，供后续找矿工作参考。

Application of Geo-electrochemical Methods to Prospecting in the Concealed Uranium:A Case Study of Lujing Area,Zhuguang

Lujing area is one of the important granite-type uranium deposits in China.To expand the reserves of resources in China and deepen the prospecting depth of uranium deposits,geo-electrochemical method is used to predict the prospecting in this area.Based on the principle of “ from known to unknown ”,the feasibility experiment of the known profile was carried out in the Shulouqiu Uranium Deposit in the south of the study area,and it was found that a clear geoelectric extraction anomaly appeared above the distribution range of the known ore body.The anomaly corresponds to the ore body with a high degree,and the ore indication is good,indicating that the geo-electrochemical method is feasible and effective in finding concealed uranium deposits in Lujing area.Through the geoelectric extraction measurement in the unknown area in Lujing area,based on the measurement data,the content of 12 elements (As,Co,Cu,Mo,Ni,Pb,Sb,Th,Ti,U,V,Zn) was counted and the enrichment and dispersion degree were analyzed by using the element variation coefficient diagram.The results show that the U element in the study area has good metallogenic potential.Through cluster analysis and factor analysis,the 12 elements were divided into three groups:F1 (Co-Ni-Cu-Pb-Zn-V-Ti),F2 (U-Th-Pb-V) and F3 (Mo-As-Sb).It is also found that the abnormal distribution of w(U)/w(Th)>1/3 value has an important reference value for finding uranium deposits.According to the abnormal matching of element combination and the abnormal plane distribution characteristics of U single element and w(U)/w(Th) value,combined with ore controlling and metallogenic geological conditions and metallogenic potential,three prospecting targets are delineated so as to provide reference for the further prespecting work.