内蒙古四子王旗萤石矿床成矿模式——兼论对火山岩型铀矿找矿的启示  

Metallogenic Model of Fluorite Deposits in Siziwangqi,Inner Mongolia:Implications for the Prospecting of Volcanic Type Uranium Deposits

作　　者：白彦 王智纲 王根厚[1] 朱立 姚富升 闫国强[3] Bai Yan;Wang Zhigang;Wang Genhou;Zhu Li;YaoFusheng;Yan Guoqiang(School of Earth Science and Resources,China University of Geoscience (Beijing),Beijing 100083,China;Xi'an Huadi Mining Management Co.,Ltd.,Xi'an 710000,China;Tianjin Center,China Geological Survey,Tianjin 300170,China)

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]西安华地矿业管理有限公司,陕西西安710000 [3]中国地质调查局天津地质调查中心,天津300170

出　　处：《金属矿山》2019年第4期121-128,共8页Metal Mine

基　　金：国家重点基础研究发展计划(973计划)项目(编号:2015CB453000);中国地质调查局项目(编号:DD20160128;DD20160129)

摘　　要：萤石矿化与火山岩型铀矿关系密切。为探究萤石矿成矿与火山岩型铀矿成矿模式之间的潜在关联,通过野外地质填图以及区域成矿资料分析,对内蒙古四子王旗萤石矿床的成矿模式进行了研究。结果表明:①四子王旗萤石矿主要产于下二叠统大石寨组流纹岩、流纹质凝灰岩与千枚状板岩、片岩的层间破碎带中,矿体主要受区域西里庙复式向斜控制,褶皱南翼矿体展布方向为NEE向、北翼矿体为NNE向,燕山期黑云母花岗质岩浆侵入作用提供了萤石成矿所需的温度和物质;②萤石成矿阶段可划分为3期,即早二叠世初始矿源层的形成时期、燕山早期大规模成矿富集时期以及燕山晚期叠加成矿时期;③矿区萤石矿床受地层、构造及岩浆活动共同控制,大规模的成矿活动完全受层间断裂控制,矿床类型为沉积—改造型萤石矿,这3期成矿阶段也与区域铀成矿物质的运移、富集、沉淀过程耦合,该模式对于火山岩型铀矿具有较好的找矿意义。Fluorite mineralization is closely related to volcanic type uranium deposits.In order to analyze the potential relevance between fluorite mineralization and volcanic type uranium metallogenic model,through field geological mapping and regional metallogenic data analysis,the metallogenic model of fluorite deposits in Siwangziqi is discussed.The study results show that:①fluorite deposits in Siziwangqi are mainly distributed in the interlayer fracture zone of rhyolite,rhyolite tuff and phyllitic slate and schist of Dashizhai Formation of Lower Permian Series,orebodies are mainly controlled by the regional Xilimiao Syncline,distribution direction of the south wing of the fold is NEE,and the distribution direction of the north wing of the fold is NNE,the fluorite metallogenic temperature and materials are provided by Yanshanian biotite granitic magmatic intrusion;②fluorite metallogenic stage can be divided into three stages,the formation period of initial ore source strata in Early Permian,large-scale metallogenic enrichment period of Early Yanshanian and superimposed metallogenic period of Late Yanshanian;③the fluorite orebodies are controlled by strata,structures and magmatic activities,the large-scale metallogenic activities are completely controlled by interlayer faults,the deposit belongs to sedimentary-modified fluorite deposit,besides that,the above three metallogenic stages of fluorite deposits in Siziwangqi are coupled with the migration,enrichment and precipitation processes of regional uranium metallogenic materials,therefore,the metallogenic model of fluorite deposits in Siziwangqi has good prospecting significance for volcanic type uranium deposits.

关 键 词：沉积-改造型萤石矿 火山岩型铀矿 成矿模式 层间断裂 找矿意义 

分 类 号：P612[天文地球—矿床学]