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硅质岩是造山带内广泛发育的一类岩石,该岩石的组成以SiO2为主,具有较高的稳定性.对于经历过造山作用、成矿作用和重结晶作用等影响的硅质岩,其宏观组构和微观组构特征可以很好地反映它所遭受到的改造.秦岭造山带西段八方山-二里河Pb-Zn矿的宏观及微观组构特征分析表明:该区硅质岩具有明显的热水沉积特征.由于受到压扭性和张性两种性质的应力作用,矿区在宏观上形成了东西向压扭性断裂和北北东、北北西两组张性断裂,微观上形成了微裂隙、微褶皱和压扁拉长的石英颗粒.矿区岩石发生了明显的变质作用,除应力作用造成的动力变质作用外,还发生了其他类型的变质作用和重结晶作用.硅质岩中微量碳酸岩矿物的存在以及应力作用对矿床的形成具有非常重要的意义,特别是其可以为金属硫化物热液提供运移的通道和沉淀成矿的空间.
Silicalite is a kind of widely developed rock in the orogenic belt, and the composition of the rock is mainly SiO2 with high stability.For the cherts that have undergone orogenic effects, mineralization and recrystallization, The macroscopic and microstructural characteristics of the Pb-Zn orebodies can well reflect the changes that they have suffered.The macroscopic and microscopic structural characteristics of the Pb-Zn ore in the west of the Qinling orogenic belt show that the siliceous Rocks have obvious hydrothermal sedimentary characteristics.Due to the stress effects of the two properties of compression and tension, the mining area formed macroscopically the east-west compression-shear fracture and the north-north-east, north-north-west two sets of tensile faults, The formation of micro-fissures, microfolds and crushed elongated quartz particles.Mineral rock metamorphic obvious metamorphism, in addition to the role of stress caused by the dynamic metamorphism, but also occurred in other types of metamorphism and recrystallization .Silicon The existence of micro-carbonate minerals and the stress effect in the quality rocks are of great significance to the formation of the deposit. In particular, they can provide channels for migration of metal-sulfide hydrothermal fluids and space for precipitation and mineralization.