云南镇康芦子园铅锌矿构造控矿规律及其机理分析

Structural ore-controlling rules and its mechanism of Luziyuan Pb-Zn deposit in Zhenkang of Yunnan

云南镇康芦子园铅-锌-铁矿为近年来发现的超大型多金属矿床,矿体产于上寒武系沙河厂组地层中,矿区内构造对矿体的产出、矿化蚀变及赋存环境均存在着明显的控制作用,矿体平面上的展布主要受北东向脆性断裂构造系统所控制,含矿层内各序次构造体系控制着矿体的形态和分布。文章利用极射赤平投影的方法对矿区含矿节理进行了分期配套,表明矿区主要受两期构造应力的作用,早期NE向应力场形成的构造体系为含矿热液的运移提供了良好的通道和赋存空间,后期NE向应力场对矿体具有错动破坏作用。

Luziyuan Pb-Zn-Fe deposit in Zhenkang of Yunnan is a supersized polymetallic deposit that is discovered in recent years.The ore bodies occur in strata of Shahechang formation of Upper Cambrian system.The occurrence,mineralization and alteration and occurrence environment of ore bodies are obviously controlled by structure of the mining area： the plane distribution of the orebodies is mainly controlled by NE strike brittle fracture structural system,and the shape and distribution of ore bodies are controlled by various sequential structural systems inside the producing formation.Polar stereographic projection method is used in this paper to allocate ore-bearing joints by stages.It is represented that the mining area is basically impacted by two phases of tectonic stress： structural system formed by early N-E strike stress field provides favorable pathway and occurrence space for the shifting of ore-bearing hydrothermal fluid;later N-W strike stress field has effect of disturbance and destruction on the ore bodies.