胶东地区郭城金矿田格子状构造控矿机制

The Ore-Controlling Mechanism of Lattice Structures in Guocheng Goldfield of Eastern Shandong

胶东地区郭城金矿田位于胶莱盆地东北缘,郭城断裂下盘荆山群变质岩和牧牛山二长花岗岩体中,矿体的形成受北东向断裂构造的控制.矿区内主要断裂构造及控矿特征研究表明,成矿期郭城断裂左行扭压活动派生了北东向次级断裂,倾向相反但走向相同或相近的北东向断裂在剖面上相交汇,形成了格子状控矿构造,使矿体分布在剖面上呈现相同倾向的一组矿体叠瓦式排列,相反倾向的两组矿体相交汇呈格子状的特征.格子状构造的形成为含金流体提供了运移的通道和沉淀成矿的容矿空间,控制了金矿体的形成与就位.

Located in the northeastern margin of the Jiaolai Basin,the goldfield of eastern Shandong was beneath the fault zone of Guocheng of the Jingshan group metamorphic and Muniushan adamellite,and the formation of the deposits was controlled by the NE-trending faults.The study for major fault structures and ore-controlling characteristics in the mining area indicated that the sinistral shear-compression activities of Guocheng fault in the metallogenic epoches derived NE-trending secondary faults,and the NE-trending faults with opposite tendencies but same or similar trend met at the profile formed lattice ore-controlling structures which made the distribution of the deposits with the same tendency presented imbricate arrangement and that with the opposite tendency presented lattice shapes in the profile.The formation of lattice structures provided channels for the gold-bearing fluid migration and ore-hosting spaces of the deposit mineralization and also controlled the formation and emplacement of the gold deposits.