冀东地区中元古代雾迷山组富锂岩系中锂的赋存状态  

The Occurrence State of Lithium in the Middle Mesoproterozoic Wumishan Formation Lithium-rich Rock Series in Eastern Hebei Province

作　　者：耿晓磊 李伟 王克冰[1] 蔡元峰 任超 吉世超[5] 王敬朝 高岩峰 汪昱光 佟昕恩 王瑞琪 GENG Xiaolei;LI Wei;WANG Kebing;CAI Yuanfeng;REN Chao;JI Shichao;WANGJingzhao;GAO Yanfeng;WANG Yuguang;TONG Xinen;WANG Ruiqi(Hebei Institute of Geological Survey,Shijiazhuang 050011,China;Key Laboratory of Surficial Geochemistry,School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China;Frontier Science Center of the Ministry of Education for Earth Critical Matter Cycle,Nanjing University,Nanjing 210023,China;School of Environmental and Biological Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Chinese Academy of Sciences Guangzhou Institute of Geochemistry,Guangzhou 510640,China)

机构地区：[1]河北省地质调查院,石家庄050011 [2]南京大学地球科学与工程学院,表生地球化学教育部重点实验室,南京210023 [3]南京大学地球关键物质循环教育部前沿科学中心,南京210023 [4]南京理工大学环境与生物工程学院,南京210094 [5]中国科学院广州地球化学研究所,广州510640

出　　处：《高校地质学报》2024年第6期694-704,共11页Geological Journal of China Universities

基　　金：中央引导地方科技发展资金(216Z4201G);河北省自然资源厅科技项目(13000021GM5KG6TOH871W)联合资助。

摘　　要：2021年河北省地质调查院在冀东地区中元古代雾迷山组地层中发现了锂的超常富集现象,这是中国首次在前寒武纪地层中发现的黏土型锂资源。该富锂岩系厚度大、分布广泛、层位稳定,Li2O品位为0.1~0.42 wt%,具有巨大的找矿潜力。作为新的赋锂层位,锂的赋存状态直接关系到本次发现的黏土型锂资源是否具有勘探开发意义。文章利用了X射线衍射(XRD)、热分析(TG-DTG)、傅里叶变换红外光谱(FTIR),查明研究区富锂岩石主要由白云石、石英和伊利石、伊蒙混层等黏土矿物组成,进一步通过固体核磁共振谱(solid state NMR)、飞行时间二次离子质谱(TOF-SIMS)、黏土矿物提纯和Na离子交换实验等技术方法,揭示了雾迷山组富锂岩系中的锂主要以类质同象替换方式的方式赋存于伊利石和伊蒙混层之中,极少量以离子吸附形式赋存于黏土矿物层间或表面。研究结果为今后在冀东地区开展黏土型锂资源的选冶和开采工作提供重要的理论基础和技术支持。In 2021,Hebei Geological Survey Institute discovered an extraordinary enrichment of lithium in the Middle Mesoproterozoic Wumishan Formation in the eastern Hebei,which is the first time that clay type lithium resources were found in Precambrian strata in China.The lithium-rich rock series has large thickness,wide distribution,stable horizon,Li2O grade of 0.1-0.42 wt%,and has great prospecting potential.As a new lithium-endowed horizon,the occurrence state of lithium is directly related to the exploration and development significance of the clay-type lithium resources discovered this time.By using X-ray diffraction(XRD),thermal analysis(TG-DTG)and Fourier transform infrared spectroscopy(FTIR),it is found that the lithium-rich rocks in the study area are mainly composed of dolomite,quartz and clay minerals such as illite and illite/smectite mixed layers.Through solid state nuclear magnetic resonance spectroscopy,time-of-flight secondary ion mass spectrometry(TOF-SIMS),clay mineral purification and Na ion exchange experiments,it is revealed that the lithium in the Wushan Formation lithium-rich rock series mainly exists in the illite and illite/smectite mixed layers in the form of isomorphic replacement,and a very small amount of lithium exists in the form of ion adsorption between the clay mineral layers or on the surface.The research results provide important theoretical basis and technical support for the selection,metallurgy and exploitation of clay-type lithium resources in eastern Hebei Province in the future.

关 键 词：黏土型锂矿 赋存状态 固体核磁共振谱 离子交换 雾迷山组 

分 类 号：P57[天文地球—矿物学]