西南三江地区沉积岩容矿型铅锌矿成矿特征和成矿规律  

Sediment-Hosted Lead-Zinc Deposits in Sanjiang Region,SW China:Characteristics and Regional Metallogeny

作　　者：江彪[1,2] 邓军[2] 张长青[1] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]中国地质大学,北京100083

出　　处：《地质学报》2014年第12期2532-2544,共13页Acta Geologica Sinica

基　　金：全国重要矿产区域成矿规律研究项目(编号1212011121037);中国分矿种(组)矿产地质总结研究项目(编号12120114039601);中国矿产地质与区域成矿规律综合研究(中国矿产地质志)项目(编号1212011220369);国家重点基础研究发展计划"三江特提斯复合造山与成矿作用"(编号2009CB421000)联合资助成果

摘　　要：以沉积岩为容矿围岩的铅锌矿床种类繁多,储量巨大,是世界上铅、锌资源的主要来源,因此,一直受到矿床学家和地质工作者的重视.近年来,三江特提斯地区因其得天独厚的成矿条件和丰富的金属矿产资源而成为矿床学界研究的热点和前沿.研究区广泛发育沉积岩容矿型铅锌矿床,空间上与自北向南发育的各新生代沉积盆地密切相伴;成矿发生在喜马拉雅碰撞造山挤压向伸展的构造转换阶段,成矿时代主要集中在41～20 Ma之间;矿床主要赋存在二叠统和三叠统灰岩地层中;矿床分布受区域逆冲-推覆系统控制,表现为近NS向断层控制矿床分布的区域性特点;矿化主要表现为热液充填逆冲断层上盘中各次级构造、裂隙和开放空间成矿;围岩蚀变较弱,主要为方解石化;主成矿元素Pb＋Zn外,往往还伴生大量诸如Ag、Sr、Sb、Cu等元素.基于区域成矿特征和成矿规律,总结了找矿标志并指明了找矿方向.Sediment-hosted Lead-zinc deposits,which are of variety in type and huge reserves,is the main source of lead and zinc resources in the world and,therefore,have been payed attention highly by ore deposit geologiest.In recent years,Sanjiang region became hot and frontier in deposit academic research due to its unique into ore-forming conditions and rich in metal mineral resources.Sediment-hosted lead-zinc deposits,which are closely accompanying with each Cenozoic sedimentary basin from north to south,are widely development in research area.Mineralization occurred in the stage of structural extrusion transfer to extension during Himalayan collision orogenic process and metallogenic epoch is mainly concentrated in 41 ～20 Ma; Deposit mainly hosted in Permian and Triassic limestone strata and controlled by regional thrust nappe system,which is nearly NS trend; Mineralization is mainly characterized by hydrothermal filling in the secondary structure of thrust fault,fracture and open space; The wall rock alteration is very simple,only dolomitization,calcitization and weak silicification can be found; Besides Pb and Zn,there are often a lot of accompanying elements such as Ag,Sr,Sb,Cu.Based on regional mineralization characteristics and metallogenic regularities,the prospecting criteria and direction are analysed.

关 键 词：三江 沉积岩型 铅锌矿 成矿规律 

分 类 号：P618.4[天文地球—矿床学]