铜陵凤凰山铜矿床角砾岩的形成与矿床定位机制

The Formation of Breccia and Ore Body's Localization Mechanism in Fenghuangshan Copper Deposit,Tongling Area,Anhui Province,China

角砾岩不仅记录了矿区构造的形成演化过程,同时也记录了矿床的形成定位过程,因此对角砾岩的产出、分布特征研究有利于进一步揭示矿床的形成与定位机制。凤凰山铜矿区不同类型角砾岩的分形研究结果表明,该区角砾状花岗闪长岩属于化学成因角砾岩,在形成过程中有物理作用的参与,而角砾状矿石和角砾状大理岩是水力致裂角砾岩,形成时能量达到中等,说明该区角砾岩的形成与成矿热液的演化密切相关。

Breccia has recorded not only the information about formation process and structure evolution, but also the information about the process of ore body＇ s formation and the localization in mining area. So, study on the output and distribution of breccia would be helped to discover the ore body＇ s formation and localization mechanism. The results of fractal analysis of different types of breccias in the Fenghuangshan copper deposit showed that the brecciated granodiorite was of chemical origin, involved with physical processes ; the brecciated ore and breociated marble were all hydraulically crushed breccias and the energy reached moderatie level when they were formed. This indicates a close relationship between the formation of breccia and the evolution of ore-forming hydrothermal solutions.