老挝爬奔金矿围岩蚀变特征与成矿期次划分研究与探讨

摘要

爬奔金矿是在老挝琅勃拉邦省巴乌县发现的一个大型的韧脆性剪切型金矿.琅勃拉邦断裂贯穿全区,矿区内围岩蚀变发育广泛,与构造期次有密切的联系.通过对矿区的地质概况,矿体及矿石的特征,围岩蚀变类型的研究,总结出了该地区的蚀变分带模式,该模式为中心式环带结构.矿体由内部向外部连续发育为硅化、褐(菱)铁矿化→褐(菱)铁矿化、碳酸盐化→碳酸盐化.基于对以上内容的研究,厘定了矿区的脉体的类型及生成序列,划分出了成矿期次的阶段,依次为浸染状网脉状的红化、菱铁矿脉、纯净的方解石脉、马尾丝状透明的方解石微细脉等4个成矿期次阶段.对该地区寻找金矿有一定的指导意义.%Phabon gold deposits is a large ductile-brittle shear gold mine in Laos.It was discovered in Bawu County of Luang Prabang province.Luang Prabang breaks through the region,a wide range of wall-rock alteration in mine development.Its construction of times is closely linked.Based on mining geology,including ore body and ore characteristics,wall rock alteration types of research,we have summed up the alteration zoning patterns in the area.The model as an annulus type structure.Ore body is from the inside to the outside of the continuous development of silicification with brown (Ling) iron mineralization→brown (Ling) iron mineralization,carbonation →carbonation.In the research,we have found the determining types of veins within the mine and generate a sequence are divided into the stages of mineralization of times,by following siderite veins,pure calcite veins,horsetail filamentous calcite veins in four mineralization of times.The quest for gold in the region have some significance.