老挝东南部某多金属矿区土壤地球化学特征及找矿预测北大核心CSCD

老挝东南部矿产资源丰富,但第四系覆盖严重。为优选老挝东南部某多金属矿区的找矿靶区,在此地区开展了11万土壤地球化学测量工作。运用含量-频数分形、变异系数、剔除比率等理论和方法,首先对研究区内Cu、Pb、Zn、Au、Ag、Bi、As、Sb、Hg九种元素的测试数据进行了统计分析,显示出Pb-Au-As-Sb元素为研究区内有利成矿元素。然后对九种元素的测试数据进行因子分析,划分出了F 1元素组合(Pb-As-Sb),F 2元素组合(Cu-Zn)和单独的Au元素共三种元素组合。最后利用含量-频数分形法计算各元素的异常下限,绘制出单元素异常图,结合地质背景,共圈定三个靶区。对成矿潜力最大的A-1靶区进行了探槽验证,在TC-1探槽可见达到工业品位的明金。证明该异常为矿致异常,为今后在研究区及相邻地区找矿提供了有力的线索和依据。

Soil geochemical characteristics and prospecting prediction of a polymetallic mining area in the southeast Laos

The southeast of Laos is rich in mineral resources, but it is seriously covered by Quaternary system. In order to optimize the prospecting target area of a polymetallic mining area in southeast Laos, a soil geochemical survey of 1:10000 was carried out in this area. Based on the theory and method of content - frequency fractal, coefficient of variation and elimination ratio, the test data of Nine elements Cu, Pb, Zn, Au, Ag, Bi, As, Sb and Hg in the study area were analyzed statistically. showing that Pb Au as sb elements are favorable metallogenic elements in the study area. Then factor analysis was carried out on the test data of nine elements, and three combinations of F1 element combination (Pb-As-SB), F2 element combination (Cu-Zn) and Au element were divided. Finally, the content - frequency fractal method was used to calculate the anomaly lower limit of each element, and an element anomaly map was drawn. Combined with the geological background, three target areas were delineated. The A-1 target area with the largest metallogenic potential was verified by prospecting trough, and bright gold with industrial grade was found in TC-1 trench. It is proved that the anomaly is ore-induced anomaly, which provides a strong clue and basis for prospecting in the study area and adjacent areas.