金沙江构造带羊拉铜矿床F_(4)断裂特征及控矿规律  

Characteristics and ore-controlling rules of the F_(4) fault in Yangla copper deposit in Jinshajiang structural belt

作　　者：岳言 李波[1] 刘月东 王新富 唐果[1,3] 刘凤泽 向佐朋 YUE Yan;LI Bo;LIU Yuedong;WANG Xinfu;TANG Guo;LIU Fengze;XIANG Zuopeng(Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China;Yunnan Diqing Mining Co.,Ltd.,Shangrila Yunnan 674400,China;Kunming Prospecting Design Institute of China Nonferrous Metals Industry Co.,Ltd.,Kunming 650051,China)

机构地区：[1]昆明理工大学国土资源工程学院,昆明650093 [2]云南迪庆矿业开发有限责任公司,云南香格里拉674400 [3]中国有色金属工业昆明勘察设计研究院有限公司,昆明650051

出　　处：《有色金属（矿山部分）》2022年第2期84-92,102,共10页NONFERROUS METALS(Mining Section）

基　　金：国家自然科学基金资助项目(41862007,41402072);云南省万人计划青年拔尖人才项目(YNWR-QNBJ-2018-093);昆明理工大学重点学科建设项目(14078384)。

摘　　要：滇西北羊拉铜矿床为金沙江铜多金属成矿带内最为典型的铜矿床,矿区内构造极其复杂,其矿体产出明显受构造控制,F_(4)断裂作为矿区内最具有代表性的NE向断裂,对矿区内成岩成矿具有控制作用,但前人并未对其系统研究。以羊拉铜矿床F_(4)断裂为研究对象,采用构造解析和元素地球化学的研究方法,对其构造特征和控矿规律进行了详细研究。研究结果表明:F_(4)断裂总体产状为NE40°~75°∠30°~78°NW,明显切断岩体、矿体,断裂带内为碎裂状绢云砂质板岩、变质石英砂岩及花岗闪长岩。F_(4)断裂经历了多期活动,早期为压扭性逆断层,晚期为右行张性正断层;F_(4)断裂既是破矿构造,也是导矿构造和容矿构造。F_(4)断裂带可划分为灰白色弱黄铁矿化粗晶大理岩带、灰白色构造碎粒岩带、灰白色构造碎粉岩—碎粒岩带、灰白—黄褐色构造碎粒岩及断层泥带、强褐铁矿化粗晶大理岩带等5个岩性—蚀变带,断裂带内成矿元素含量明显较高,F_(4)断裂上、下裂面以及NE向层间断裂均富集成矿元素。The Yangla copper deposit in northwest Yunnan is the most typical copper deposit in Jinshajiang copper polymetallic metallogenic belt.The structure in the mining area is extremely complex,and the ore body output is obviously controlled by the structure.F_(4) fault is the most representative NE-trending fault in the mining area,which has a control effect on the rock formation and mineralization of the mining area.In this paper,the F_(4) fault of Yangla copper deposit is taken as the research object,and the structural characteristics and ore-controlling rules are studied in detail by means of structural analysis and elemental geochemistry.The results show that the overall occurrence of F_(4) fault is NE40°—75°∠30°—78°NW,and the rock mass and ore body are obviously cut off.The fault zone is fractured sericite sandy slate,metamorphic quartz sandstone,and granodiorite.F_(4) fault has experienced multi-stage activities.The early stage is compressive-torsional reverse fault,and the late stage is right-lateral tensile normal fault.F_(4) fault is not only ore-breaking structure,but also ore-conducting structure and ore-hosting structure.The F_(4) fault zone can be divided into five lithologic-alteration zones:gray-white weakly pyritization coarse-grained marble zone,gray-white tectonic granulite zone,gray-white tectonic granulite-granulite zone,gray-white-yellow tectonic granulite and fault mud zone,and strong limonite mineralization coarse-grained marble zone.The content of ore-forming elements in the fault zone is obviously high,and the upper and lower fractures of F_(4) fault and NE-trending interlayer faults are enriched in ore-forming elements.

关 键 词：构造特征 控矿规律 F_(4)断裂 羊拉铜矿床 金沙江构造带 成矿元素 地球化学 构造解析 

分 类 号：P61[天文地球—矿床学]