牟定郝家河铜矿床的构造控矿特征

STRUCTURAL CONTROL FEATURES OF HAOJIAHE COPPER DEPOSIT IN MOUDING COUNTY

郝家河砂岩型铜矿床产于滇中中生代陆相红色碎屑岩建造中,规模中型。构造线总体方向为NW-SE,主要构造为NNW向和近EW向的褶皱和断层,其次为NW、NE向的次级断层。矿区构造对矿床的形成起着双重控制作用:构造活动是成矿物质活化、迁移的重要热源和动力;构造控制着矿床的空间产出位置。狮子山背斜及一系列NNW向隐伏断层控制着矿床的展布;近EW向密集发育的小规模隐伏断层及其与NNW向隐伏断层的交切部位控制着矿体形态及其富厚部位。

The Haojiahe sandstone copper deposit occurs in the red elastic rock for-mation of Mesozoic continental facies in central Yunnan, being a medium size one. General direction of the structural line strikes' NW-SE and the main structures consist of folds and faults running NNW and nearly EW, with minor secondary faults running NW and NE. Structures in the ore area play a dual control role to the formation ef deposit: i.e., structural activity was the important heat source and power for the activation and migration of metallogenic matter; structures controlled the space of occurrences of the deposit. The deposit extension is controlled by the Shixishan anticline and a series of concealed faults. The shapes and the rich-thick positions of ore bodies are controlled by the crossing positions of dense small concealed faults nearly EW with the concealed faults of NNW direction.