凤凰山铜矿床矿体定位机制研究  

Research on Mechanism of Orebody Location in Fenghuangshan Copper Deposit

作　　者：毛政利[1] 彭省临[2] 赖健清[2] 

机构地区：[1]平顶山工学院 [2]中南大学

出　　处：《金属矿山》2006年第11期57-61,共5页Metal Mine

基　　金：国家"十五"科技攻关项目(编号:2001BA609A-06)部分研究成果。

摘　　要：凤凰山铜矿床主要有矽卡岩型和斑岩型2种矿体类型,它们的产出均受岩体接触带与断裂构造复合控制,流体包裹体研究结果表明,其成矿流体为岩浆水和地层水混合而成的中低温流体;分形研究结果显示,本区与矿体密切相关的角砾状矿石和角砾状大理岩属于水力致裂角砾岩,角砾状花岗闪长岩在形成过程中亦有物理作用的参与。因此,本区矿体的定位主要受控于岩浆侵位的热动力以及由此引起的构造应力场变化所产生的压力差,它们驱使成矿流体在岩体边部聚集,并使围岩破裂形成角砾岩,使成矿流体的物理化学条件发生变化而沉积成矿。Fenghuangshan copper deposit is mainly composed of two types of orebodies, namely, skarn and porphyry, whose occurrence is controlled jointly by the rockmass contact belt and the faulted structure. The study on the fluid inclusion shows that the ore-forming fluid was the low-medium temperature fluid mixed by water in magma and in strata. The fractal study indicates that the breccial ore and breccial marble closely related to the orebodies belongs to hydropower-fractured breccia and the breccial granite-diorite took part in the physical ore-forming process. Therefore, the orebody location was mainly controlled by the thermodynamic power of the magma intrusion and the pressure difference induced by the change in the structural stress field caused by the thermodynamic power, which forced the ore-forming fluid to accumulate at the rock edge and led to the fracture of the wall rock so as to form breccia. The physiochemical conditions of the ore-forming fluid were thus changed, which finally led to the ore-formation by deposit.

关 键 词：成矿流体 分形 定位机制 凤凰山铜矿 

分 类 号：P588.121[天文地球—岩石学]