承德凤山盆地富锂页岩地质地球化学特征及资源潜力分析  

Geological and geochemical characteristics and resource potential analysis of lithium-rich shale in Fengshan Basin,Chengde

作　　者：郭静粉[1] 王晓东 刘剑波 冯广含 张立剑[1] 刘思远 GUO Jingfen;WANG Xiaodong;LIU Jianbo;FENG Guanghan;ZHANG Lijian;LIU Siyuan(The Forth Geological Brigade of Hebei Bureau of Geology and Mineral Resources Exploration,Chengde 067000,Hebei,China)

机构地区：[1]河北省地质矿产勘查开发局第四地质大队,河北承德067000

出　　处：《矿产勘查》2022年第10期1470-1476,共7页Mineral Exploration

基　　金：河北省地矿局科研资金项目“河北沉积型锂等三稀矿产赋存特征和钒钛磁铁矿中钪的综合利用研究”(454-0502-JBN-495V)资助。

摘　　要：承德凤山盆地具有明显的水系沉积物Li元素异常,地表对应出露白垩系九佛堂组地层,经野外地质调查,在九佛堂组二段下部发现富锂页岩。该富锂页岩厚度大、层位稳定、分布广泛,对其开展岩石特征、地球化学特征研究,对探讨锂的物质来源、形成环境,分析资源潜力具有重要意义。研究结果显示,富锂页岩含有较高的含钾矿物、镁铁组分和稳定组分,显著富集Rb、Th、K、La、Ce、Sr等大离子亲石元素,轻稀土相对富集并具明显的Eu负异常和Ce负异常特征。对比沉积型锂矿床成矿条件,凤山盆地富锂页岩是深湖—半深湖沉积体系的产物,锂可能来源于白垩系张家口组酸性火山岩,其沉积环境为还原环境,有利于锂的富集保存,具有较好的找矿前景。Fengshan Basin has obvious stream sediment Li element anomaly,and Jiufotang formation are exposed on the surface.Through field geological survey,lithium-rich shale is found in the lower part of the second member of Jiufotang formation.The lithium-rich shale is thick,stable and widely distributed.The research on its rock characteristics and geochemical characteristics has important significance to explore the material source,formation environment and resource potential of lithium.The results show that the lithium-rich shale contains high potassium-bearing minerals,magnesium and iron components and stable components,and significantly enriches large ion lithophile elements such as Rb、Th、K、La、Ce and Sr,with relative enrichment of light REE and obvious characteristics of negative Eu anomaly and negative Ce anomaly.Compared with the metallogenic conditions of sedimentary lithium deposits,the lithium-rich shale in Fengshan Basin is the product of deep lake and semi-deep lake sedimentary system.Lithium may come from the acidic volcanic rocks of Zhangjiakou formation.The sedimentary environment is a reducing environment,which is conducive to the enrichment and preservation of lithium.Therefore,Fengshan Basin has a good prospect for exploring sedimentary-type lithium deposit.

关 键 词：地质调查 物质来源 资源潜力 沉积型锂矿 

分 类 号：P618.71[天文地球—矿床学]