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大水清金矿带是华北克拉通中有代表性的改造型绿岩金矿之一。它产于前东武纪绿岩地体中安家营子石英二长岩体内外接触带附近的剪切带中。金矿化交代主要受后阶段张性脆裂控制,而剪切带早阶段韧性剪切作用无明显矿化交代,后者主要为成矿交代提供有益的江游交代构造环,境即成矿交代蚀变作用和剪切带同步的两阶段演化模式。大水清金矿带的交代作用有四个阶段:即用长石化阶段,绿泥石化阶段,黄铁绢英岩化和石英-硫化物阶段以及石英-碳酸盐化阶段。第三阶段由五个亚阶段组成:即黄铁绢英岩化和强硅化-强黄铁矿化,石英-多金属硫化物交代,石英-贫扶矿充填交代和细粒黄铁矿充填交代。其中前四个亚阶段是本区金的主要成矿期.当韧性剪切转化为张性脆裂时产生的骤然扩容和伴随发生的交代体系转变为富硅体系的钾交代和石英-硫化物交代是金矿成矿的关键。本文还研究和探讨了该金矿成矿交代流体的性质及交代的物理化学环境。
The Da Shuiqing gold belt is one of the representative modified greenstone gold deposits in the North China Craton. It is produced in the shear zone near the inner and outer contact zones of the Anjiayingzi quartz monzonite in the former Dongwuji Greenstone. The gold mineralization is mainly controlled by the later stage of brittleness, whereas the ductile shear in the early stage of shear zone has no obvious mineralization. The latter is mainly used to provide beneficial structural interpretation of the Jiangou account for metallogenetic metasomatism. Explain the two-stage evolution mode of alteration and shear band synchronization. There are four stages of metasomatism in the Dashuqing gold belt: the long-feldspathic stage, the chloritrification stage, the yellow-iron-siliceous-petrified and quartz-sulphide stage, and the quartz-carbonated stage. The third phase consists of five sub-phases: yellow-iron-siliceous and strongly silicified-pyrite mineralization, quartz-polymetallic sulphide metasomatism, quartz-lean mineralization, and fine-grained pyrite mineralization. The first four sub-stages are the main gold-forming periods of the area. The sudden expansion and concomitant occurrence of transitional ductile shear to brittle brittle transition into the silicon-rich system of metasomatism and quartz-sulfide metathesis are key to gold mineralization. The paper also studies and discusses the nature of ore-forming fluids and the physico-chemical environment of this gold deposit.