关键词: 结构构造, 再活化机制, 铜锌矿, 成矿时代, 树基沟, 辽宁

Abstract:

Located in the Archean greenstone belt, the Shujigou copper-zinc deposit belongs to the volcanic-associated massive sulfide deposit (VMS). By LA-ICP-MS zircon U-Pb dating, it’s conformed that the ore-hosting biotite-gneiss was formed at ca. 2 565 Ma, which can also represent the ore-forming age. Multiple phase of metamorphism resulted in changing of ore textures and forming of such special textures as recrystallization, brittle deformation, durchbewegung, replacement and retrograde textures. The ore-forming components have undergone two periods of remobilization which corresponds to two phases of metamorphism and deformation events. The earlier, during the Anshan tectonic movement, mechanical remobilization played an important role, and formed “ore capsule” in the position of small pressure. The later, during the Lüliang tectonic movement, both mechanical remobilization and chemical remobilization affected the ore, the matrix sulphides and silicate minerals, moved from the matrix into the fractured individual pyrite metablasts and have replaced them to some degrees.

Key words: texture and structure, remobilization mechanism, copper-zinc deposit, metallogenic age, Shujigou, Liaoning Province