首页> 中文期刊> 《地质论评》 >大陆碰撞环境沉积岩或变质岩容矿Pb-Zn矿床的发育特点和成矿机制

大陆碰撞环境沉积岩或变质岩容矿Pb-Zn矿床的发育特点和成矿机制

         

摘要

笔者等通过对不同类型大陆碰撞造山带环境下铅锌矿床进行归纳总结,并进行对比分析,认为在陆陆碰撞的主碰撞阶段,由于板块的汇聚挤压,在碰撞造山带两侧或一侧形成的前陆盆地中发育碳酸盐岩台地,碳酸盐岩未变形或弱变形,来自盆地的卤水在造山带隆升造成的重力势的驱动下,向盆地边缘汇聚,萃取盆地中的成矿元素,在碳酸盐岩的岩溶或断裂中形成MVT型铅锌矿床.在晚碰撞走滑转换阶段,盆地卤水和地层水萃取盆地地层或基底内的成矿物质形成成矿流体,陆陆碰撞持续挤压力使盆地强烈变形,同时在盆地内发育一系列逆冲推覆系统,并驱动成矿流体发生侧向迁移;在挤压后的短暂松弛阶段,成矿流体灌入逆冲断裂及其伴生的次级走滑断裂或张裂隙中形成独具特色的沉积岩容矿铅锌多金属矿床.大陆碰撞造山带挤压至伸展这一应力转换阶段,成矿流体灌入张性构造中,形成类似秦岭碰撞造山带环境产出的脉状铅锌矿床.%Based on the characteristics of lead-zinc deposits which located in the different types of continental collision orogenic belt, in main collision stage of continental collision, the foreland basin has formed in one side or both sides of the different types of collision orogenic belt as the flexural subsidence of continental crust by compression of the massif. Then, the undeformed or weakly deformed carbonate platform has formed in the sedimentary basin. The brine from sedimentary basin was drived by the gravity because of orogenic uplift, converged to the edge of the basin, extracted ore-forming elements of basins, flowed to carbonate karst or fracture in the edge of the basin, formed the MVT lead-zinc deposits. In the slip transformation stage of late collisional period, the brine from basin and formation water extracted ore-forming minerals of strata or basement rocks and formed ore-forming fluid. The sustained force of compression from continental collision drived the ore-forming fluid lateral fluxion, simultaneity, made the basin intense deformation and formed a series thrust system. The sediment-hosted lead-zinc polymetallic deposits which possesses special characteristics has formed in the thrust fault and its associated secondary strike-slip fault or tensional fault when short stretching phase after continental collision. The vein lead-zinc deposits was produced in the collision orogen metamorphic terrane similar to deposits which were formed in the Qinling collision orogenic belt, as ore-forming poured into tensile structure during compression to extend transformation stage .

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