西藏多不杂铜金矿床成矿特征分析

The analysis of geologic characteristics of Bolong Cu-Au deposit in Tibet

西藏多不杂铜金矿床是位于班公湖-怒江成矿带西段的一个大型斑岩型铜矿床。多不杂矿体为向南陡倾的板状体;成矿斑岩为花岗闪长斑岩,具黄铜和黄铁矿化;以斑岩体中心向外依次划分为钾硅化带、粘土化带、角岩化带以及硅化-绿泥石化带。通过对多不杂矿床矿床地质、矿体特征、矿石特征及蚀变特征等方面分析,认为多不杂铜金矿床与多不杂斑岩关系密切,应先成岩后成矿;后期含矿热液以细脉或细脉浸染状溶在褶皱轴部节理(为主)及褶皱相关节理裂隙系统;矿床类型为斑岩型铜金矿床。

Bolong ore concentration area are located in the west of Bangong Lake-Nujiang Metallogenic Belt,which is a large ore deposit. Bolong ore body looks like southward-dipping pole; Ore-bearing rock body is granitic porphyre which includes pyritization and chalcopyrite; alteration around Bolong rock is characterized by zoning as silicified, clayzation, hornfelsic and Silicide-chloritization. By the study of mineral deposits,such as ore body characteristics、ore character、metasomatic features, Bolong ore body are closely related; the posterior ore bearing hydrothermal is included in the fold axial zone; this deposit is a copper-gold porphyry deposit.