斑岩成矿系统多中心复合成矿作用模型——以西藏甲玛超大型矿床为例  

Polycentric complex mineralization model of porphyry system: A case study of Jiama superlarge deposit in Tibet

作　　者：林彬[1] 唐菊兴[1] 唐攀 郑文宝[1] Greg Hall 陈国良 张忠坤 LIN Bin;TANG JuXing;TANG Pan;ZHENG WenBao;GREG Hall;CHEN GuoLiang;ZHANG ZhongKun(MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,CAGS,Beijing 100037,China;Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,Sichuan China;China Gold International Resources Co.,Ltd.,Beijing 100011,China;Tibet Huatailong Ming Co.,Ltd.,Lhasa,850212,Tibet,China)

机构地区：[1]中国地质科学院矿产资源研究所自然资源部深地资源成矿作用与矿产预测重点实验室,北京100037 [2]西南交通大学地球科学与环境工程学院,四川成都611756 [3]中国黄金国际资源有限公司,北京100011 [4]西藏华泰龙矿业开发有限公司,西藏拉萨850212

出　　处：《矿床地质》2019年第6期1204-1222,共19页Mineral Deposits

基　　金：国家重点研发计划-深地专项（编号：2018YFC0604101）;中国地质科学院基本科研业务费专项经费项目（编号：SYSCR2019-02）;西藏自治区科技计划项目（编号：XZ201901-GB-24）;国家自然科学基金项目（编号：41902097）联合资助

摘　　要：青藏高原冈底斯成矿带诸多大型-超大型斑岩成矿系统的勘查和研究成果显示,传统的陆缘弧或岛弧背景的成矿作用模型不能更好的用于指导碰撞造山背景下斑岩成矿系统的勘查实践。文章以甲玛超大型矿床为实例,基于十余年的勘查实践,通过对不同类型矿体蚀变和矿化结构的精细解剖和成岩成矿年代学的系统分析,建立造山背景下斑岩成矿系统多中心复合成矿作用模型。同时,系统总结甲玛矿床地质特征,阐述成矿作用模型中地层、构造、岩浆等基础地质要素,并详细解析斑岩型钼铜矿体、矽卡岩型铜多金属矿体、角岩型铜钼矿体、Manto型富铜铅锌矿体以及独立金矿体所构成的多元矿体结构特征。最后,揭示甲玛斑岩成矿系统多中心复合成矿作用模型与传统模型的差异,提出其对相同构造背景下斑岩成矿系统勘查评价的启示。The traditional mineralization model of the porphyry system under the setting of continental arc or island arc cannot be applied to the exploration in the background of collision orogeny favorably,as shown by the exploration and research results of many large or superlarge porphyry deposits in the Gangdise metallogenic belt in the Tibetan Plateau.For this reason,taking the Jiama superlarge deposit as an example and based on the exploration of more than ten years,the authors constructed the polycentric complex mineralization model of porphyry mineralization system under the orogeny setting based on analyzing the geological structure of different types of orebody alteration and mineralization structure and a systematic analysis of geochronology.In addition,the authors presented the basic geological units of this model,such as strata,structure,magma according to the geological characteristics of the Jiama deposit and revealed the structures of the porphyry Mo-Cu orebody,skarn Cu polymetallic orebody,hornfels Cu-Mo ore-body,Manto Cu-Pb-Zn rich orebody and independent gold orebody in the Jiama deposit,respectively.Finally,the authors explored the difference between the polycentric complex mineralization model of Jiama and the traditional model of porphyry system,and gave some suggestions for the exploration and prospecting of the porphyry system under the collision orogeny setting.

关 键 词：地质学 斑岩成矿系统 多中心复合成矿作用模型 甲玛 冈底斯 西藏 

分 类 号：P618.41[天文地球—矿床学] P618.65[天文地球—地质学]