云南楚雄红层盆地六苴砂岩铜矿区断裂的地质特征及其与成矿的关系  

Geological characteristics of faults in the Liuju sandstone copper dis- trict in the Chuxiong red-bed basin,Yunnan,China,and their relations to mineralization.

作　　者：吴鹏[1] 韩润生[1] 胡煜昭[1] 李路乔 郭学兵 苏继泉 

机构地区：[1]昆明理工大学国土资源工程学院 [2]云南楚雄矿冶股份有限公司,云南楚雄675400

出　　处：《地质通报》2008年第5期618-625,共8页Geological Bulletin of China

基　　金：国家危机矿山接替资源勘查项目(编号：200453001);教育部新世纪优秀人才支持计划项目(编号：NCET-04-917)资助

摘　　要：云南六苴铜矿区分布有六苴、凹地苴等典型砂(页)岩型铜矿床。在矿区大比例尺填图的基础上,运用构造成矿动力学的理论和方法,筛选典型断裂进行断裂面力学性质的鉴定,划分构造期次,总结构造体系,对区内不同期次、不同方向断裂的地质特征及其与成矿的关系进行了系统的阐述。认为矿区断裂的发育经历了早期近东西向挤压、晚期北东—南西向挤压和后期近南北向挤压的过程。早期近东西向主应力作用时期是铜富集成矿的重要时期,形成的近南北向压性断裂为成矿提供了有利的场所和必要的条件;晚期北西向压扭性断裂、北东向扭张性断裂促使矿体进一步富集;后期近东西向压扭性断裂开始破坏矿体,将矿体向全浅色砂岩一侧错动。The Liuju and Wadiju copper deposits in the Liuju copper district, Yunnan, are typical examples of sandstone （shale） type copper deposits, In this paper, geological characteristics of faults of different trends and phases and their relations to mineralization are systematically elucidated based on large-scale mapping and using the theory and method of mineralization tectono-dynamics. Typical faults are selected for the identification of the mechanical nature of fault planes and division into tectonic phases and tectonic systems. The results show that the formation and development underwent nearly E-W compression in the early stage, NE-SW compression in the late stage and N-S compression in the last stage. The nearly E-W compression stage was an important period of copper concentration and mineralization and the nearly N-S-trending compressional faults formed in this stage provide favorable sites and necessary conditions for mineralization. The NW-trending transpressional faults and NE-trending transtensional faults formed in the late stage caused further enrichment in copper. The neady EW-trending transpressional faults formed in the last stage began to destruct orebodies and displaced the orebodies to the side of wholly light-colored sandstone.

关 键 词：断裂 地质特征 成矿作用 砂岩型铜矿床 云南楚雄盆地 

分 类 号：P618.41[天文地球—矿床学] P542.3[天文地球—地质学]