老挝纳勐金矿区地质特征及找矿方向

Geological characteristics and prospecting direction in Nameung gold deposit area,southern Laos

纳勐金矿区位于北北西向长山—邦美蜀海西印支复式褶皱带东南端,成矿地质条件优越,原为砂金采集地,通过化探、地质填图、槽探、钻探等勘查手段,初步查明了西部含矿构造蚀变带(F1)和东部含矿构造蚀变带(F2),在东部含矿构造蚀变带发现原生金矿,原生金矿与硅化、钠长石化、碳酸盐化、黄铁矿化等关系密切,属构造蚀变岩型金矿。文章通过成矿地质条件分析,探讨该区的金矿找矿方向。

The Nameung gold deposit area is located in the southeastern part of NNW-trending Truongson-Buonmathuot complex fold belt of Hercynian-Indosinian epoches,and there is favoarable metallogenic geological conditions.Through geochemical survey,geological mapping,trenching and drilling exploration,ore-bearing structure-alteration zones were denliented in the eastern and western parts,i.e.,F1 zone in the east and F2 in the west,and the primary gold mineralization was found in the F1 zone where the previous placer gold mining occurred.The gold mineralization is closely related to siliconization,albitization,carbonatation and pyritization,it is structral altered rock type gold deposit.Through the analysis of ore-forming geological conditions,the prospecting direction was proposed in this area.