老挝东南部某多金属矿区土壤地球化学特征及找矿预测  

Soil Geochemical Characteristics and Prospecting Prediction of A Polymetallic Mining Area in the Southeast Laos

作　　者：杨青松 高文[1,2] 罗先熔 刘攀峰[1,2] 梁鸣 刘永胜[1,2] 石佳磊 孙瑶 YANG Qingsong;GAO Wen;LUO Xianrong;LIU Panfeng;LIANG Ming;LIU Yongsheng;SHI Jialei;SUN Yao(Institute of Concealed Deposit Prediction,Guilin University of Technology,Guilin University of Technology,Guilin,Guangxi 541004;Guangxi Key Laboratory of Hidden Metallic Ore Deposits,Guilin,Guangxi 541004)

机构地区：[1]桂林理工大学地球科学学院,广西桂林541004 [2]广西隐伏金属矿产勘查重点实验室,广西桂林541004

出　　处：《地质与勘探》2022年第5期1128-1138,共11页Geology and Exploration

基　　金：广西科技计划项目青年基金项目(编号:2022GXNSFBA035548);广西科技计划项目(编号:2021JJA150037);桂林理工大学科研启动基金项目(编号:GUTQDJJ2019166)联合资助。

摘　　要：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。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 110000 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.It is shown 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 F 1 element combination(Pb-As-Sb),F 2 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 the trench TC-1.It is proved that the anomaly is ore-induced,which provides a strong clue and basis for prospecting in the study area and adjacent areas.

关 键 词：土壤地球化学 金多金属矿 元素异常特征 分形 找矿预测 老挝 

分 类 号：P632[天文地球—地质矿产勘探]