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龙山铅锌矿区次生氧化富集带内的菱锌矿床,位于马蹄寨复向斜北西翼,主要赋存于中上寒武统娄山关群上部和下奥陶统南津关组底部的硅化体与灰岩接触界面附近,呈似层状、透镜状和原生铅锌矿床或硅化体产状基本一致。矿石成分主要为菱锌矿,次为异极矿、水锌矿。物相分析表明,菱锌矿主要以碳酸锌形式存在,次为碱式硅酸锌,属菱锌矿异极矿混合矿相。形成机理是:区内原生硫化物铅锌矿床(化)的下伏围岩属易溶性块状纯灰岩,处在潮湿气候下的长期氧化作用过程中,由于灰岩自身的溶解剂作用,和矿体(硅化体)底部灰岩层间及构造裂隙的控制,于碱性条件下形成。
The zinc-zinc deposits in the secondary oxidation-enrichment zone of Longshan Pb-Zn deposit are located in the northwestern wing of the syncline of the Zhazizi complex and mainly occur in the upper part of the Loushanguan Group in the middle-upper Cambrian and the silicification in the bottom part of the Nanjinguan Formation in the Lower Ordovician In the vicinity of the contact interface between the body and the limestone, it is in the form of a layer, and the shape of the lens is basically the same as that of the native Pb-Zn deposit or silicide. The ore composition is mainly calamine, followed by hemimorphite, water zinc. The phase analysis shows that the calamine is mainly in the form of zinc carbonate, and the second is zinc silicate, which belongs to the heterogeneous ore mixed phase of calamine. The forming mechanism is that the underlying wall rocks of the native sulphide lead-zinc deposits in the area are easily soluble massive pure limestones, which are exposed to long-term oxidation processes in humid climates. Due to their dissolution effect, And the ore body (silicide) at the bottom of limestone interlayer and structural cracks control, formed under alkaline conditions.