老挝班康姆铜金矿红土型金矿地质特征及找矿方向

Geological characteristics and prospecting directions of lateritic gold deposits in Pangkuam Cu-Au mining area of Laos

老挝班康姆金矿床存在两类金矿化,即产于安山岩与大理岩接触带处并受断裂带控制的低温热液硫化物原生金矿化和产于原生金矿化附近的残坡积红土型金矿化。红土型金矿化主要呈带状或似层状产出于第四系红土层中。研究认为,本区红土型金矿化主要为原生金矿受物理风化作用而形成的残坡积再生改造型金矿,成矿过程主要受原生金矿化及红土化作用控制,并结合地质、化探特征在本区圈出7处找矿靶区。

Pangkuam Cu-Au deposit in Laos has two kinds of mineralization.One is low temperature hydro-thermal sulfide primary gold mineralization which occurs at the contact zone between andesite and marble and is controlled by fracture belt,and the other is eluvial and deluvial lateritic gold mineralization adjacent to pri-mary gold mineralization.Lateritic gold mineralization mainly occurs as banding or stratoid in form in the Quaternary red soil layer.The author believed that the lateritic gold mineralization were predominated by eluvial-deluvial regenerated-reworked type gold deposits which were formed by primary gold ores through physical weathering.The ore-forming process is mainly controlled by primary gold mineralization lateritiza-tion.Based on geological and geochemical characteristics,7 prospecting target areas are blocked out in this area.