利比里亚Harper地区水系沉积物地球化学特征及找矿方向  

Stream sediment geochemistry and prospecting targets in Harper,Liberia

作　　者：白洋 陈开旭 陈冲 李福林 张继纯 魏凌霄 司可夫 郑雄伟 胡云飞 吴颖 张元培 BAI Yang;CHEN Kai-Xu;CHEN Chong;LI Fu-Lin;ZHANG Ji-Chun;WEI Ling-Xiao;SI Ke-Fu;ZHENG Xiong-Wei;HU Yun-Fei;WU Ying;ZHANG Yuan-Pei(Hubei Key Laboratory of Resources and Eeo-Environmental Geology,Wuhan430056,China;Geophysical Exploration Brigade,Hubei Geological Bureau,Wuhan430056,China;Wuhan Center,China Geological Survey(Central South China Innovation Center for Geosciences),Wuhan430205,China)

机构地区：[1]资源与生态环境地质湖北省重点实验室,湖北武汉430056 [2]湖北省地质局地球物理勘探大队,湖北武汉430056 [3]中国地质调查局武汉地质调查中心(中南地质科技创新中心),湖北武汉430205

出　　处：《物探与化探》2024年第2期382-392,共11页Geophysical and Geochemical Exploration

基　　金：商务部援外技术合作项目“援利比里亚矿产资源调查”(IGGEF2015042)。

摘　　要：比里姆(Birimian)岩系作为西非地区最重要的Au成矿岩系,在利比里亚东南部的Harper地区广泛分布,Harper图幅1∶25万水系沉积物测量数据的地球化学特征参数表明,区内Au、Hg等元素具有强富集、强分异的分布特征,As具有富集、强分异的分布特征,显示出该地区优异的Au找矿前景。通过元素相关性分析,本次筛选出能够有效指导Au矿勘查的F1因子(Au-Hg-Pb-Sn元素组合)及F2因子(As-Sb-W元素组合),通过对两组主因子中的Au、Hg、As、Sb 4种元素开展异常信息提取,圈定出13处组合异常,有效反映了区内不同类型金矿(点)的异常分布特征。异常区的地质矿产检查工作表明,在具有定向展布特征且异常强度较高的HS1-HS3、HS12-HS13组合异常区内具有明显的Au矿化信息,以此为基础,圈定出Seethum New及Behwan等2处可供开展进一步详细勘查工作的Au重点找矿远景区。Birimian rocks,the most significant Au ore-forming rocks in western Africa,are widespread in Harper,southeastern Liberia.As indicated by the geochemical parameters from the 1∶250000 stream sediment survey of this region,elements Au and Hg exhibit high enrichment and high differentiation while element As manifests enrichment and high differentiation.These findings suggest considerable potential for Au prospecting.Based on the correlation analysis of elements,this study selected factors F1(for the Au-Hg-Pb-Sn association)and F2(for the As-Sb-W association)to effectively guide the exploration of gold deposits.Thirteen composite anomalies were delineated by extracting the anomaly information of Au,Hg,As,and Sb from the two principal factors,effectively reflecting the anomaly distributions of different gold deposits or ore occurrences.The geological and mineral surveys in anomaly areas reveal that areas HS1-HS3 and HS12-HS13 with composite anomalies characterized by directional distribution and high intensities show distinct Au mineralization information.Based on this,two major Au prospects,i.e.,Seethum New and Behwan,have been identified for further detailed exploration.

关 键 词：金矿 水系沉积物 异常提取 成矿远景区 利比里亚 

分 类 号：P632[天文地球—地质矿产勘探]