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1地质背景四川天宝山铅锌矿床位于扬子地台西南缘、攀西裂谷东部,在小江-甘洛断裂带和箐河-程海断裂带之间的安宁河断裂带中。地层由基底和盖层两部分组成(周名魁等,1988)。基底为前震旦系会理群,盖层由震旦系-中生界组成,与基底呈角度不整合接触关系。区内最主要的构造以近南北向和近东西向,在区域性南北向边界断裂之间,有小规模北东、北西、近东西向断裂构造及产状平缓的层间剥离构造。本区最主要的
1 Geological Background The Tianbaoshan lead-zinc deposit in Sichuan Province is located in the Anninghe fault zone between the Xiaojiang-Ganluo fault zone and the Tiehe-Chenghai fault zone in the southwestern margin of the Yangtze platform and east of the Panxi rift. The formation consists of two parts, the basement and the cover (Zhou Mingkui et al., 1988). The basement is a pre-Sinian tectono-logical group, and the caprock is composed of Sinian-Mesozoic mantle, which is angularly unconformable and in contact with the substrate. The most important structures in the area are near north-south direction and near-east-west direction. Between the regional north-south boundary faults, there are small-scale north-east, north-west, near-east-west fault structures and gentle-producing peel-off structures. The most important area