老挝平然村铜镍硫化物矿床地质特征及找矿前景

Geological characteristics and prospecting potential of Pingran village Cu-Ni sulfide deposit in Laos

老挝平然村铜镍硫化物矿床位于马江-桑怒岛弧成矿带。矿区出露的地层为古生界培哄组变质岩系,岩性主要是绿片岩和绢云母片岩。区域性马江断裂具有切割深度大、多期活动等特征,由该断裂构造运动派生的一系列NW向构造构成了区域性重要的控岩控矿构造,控制了镁铁质—超镁铁质岩体及铜镍硫化物矿体在空间上呈NW向产出。早期的蛇纹岩是矿区铜镍硫化物的唯一成矿母岩。铜镍矿体呈似层状、透镜状及脉状赋存于镁铁-超镁铁质岩体内,与围岩呈渐变或突变接触。在系统阐述区域成矿地质背景、矿床地质特征、矿床成因的基础上,对其对找矿前景进行了初步探索。

Pingran Village Cu-Ni Sulfide Deposit in Laos is located in Ma Jiang-Xam Nua island arc metallogenic belt. In mineral area, the stratum which croped out is Peihong groups metamorphic rocks, the lithology is greenschist and sericite schist. Regional Ma Jiang fault is characteristic of cutting deeply and frequent inheriting activity, The northwest faults are derived from Ma jiang fault, they are important the structure of controlling-rock and controlling ore, controlled the distribution of mafic , ultramafic rocks and ore-body of coppe^nickel sulfide. The early serpentinites are the only source rocks of copper-nickel sulfide mineralization. The ore bodies occur in the Mafic uhramafic rock body. These ore bodies look like quasi- stratified,lens, and nervation shapes, with transition or mutation relation to surrounding rocks. Base on systematical expatiations of the regional mineralization geological background, the geological characteristics and the genesis of ore deposits,a preliminary exploration of its ore prospects is proposed.