老挝帕奔金矿矿床地质特征及控矿因素

Geological Characteristics and Ore-controlling Factors of Phabon Gold Deposit,Laos

帕奔金矿床赋存于古生界二叠系灰岩中及与之相邻的接触带上.矿床受NNW向脆性断裂的控制,区域内构造发育,成矿条件优越.在前人研究的基础上,以帕奔金矿床为研究对象,通过对矿区地质概况、金矿矿床的类型及特征等的研究,按照矿床矿体热液作用类型、矿体就位方式和地质环境可分为四类:构造蚀变岩型金矿、断层破碎角砾岩型金矿、热液充填碳酸盐脉型金矿、红土型或溶洞型金矿.总结出该区是以构造作用和围岩蚀变为主的控矿因素,且运用元素地球化学参数特征,以及地球化学异常组合的方法,获取了区域找矿标志,对以后该地区寻找金矿具有重要的指导意义.

Phabon gold deposit hosted in Permian Paleozoic limestones and the adjacent contact zone. Controled by NNW brittle fracture,the deposit structure developed in the region,and the metallogenic condition was superior. On the basis of the previous studies on Phabon gold deposit,the mining geology,gold deposit type and characteristics of the deposit were analyzed. According to the type of hydrothermal ore deposit,ore body in place ways and geological environment,it can be divided into four categories,structural alteration type gold deposits,broken fault breccia type gold deposits,hydrothermal filling carbonate vein type gold deposits,and laterite？type/cave？type gold deposits. We summed up that the tectonization and wall rock alteration are the main ore？controlling factors of the area. Based on the element geochemistry parameters characteristic,we used geochemical anomalies combined method to get the regional ore indications,providing important guidance for exploration gold deposits of the area in future.