摘要
2021年项目组在冀东地区发现中元古代富锂沉积岩系,是我国首次在前寒武纪地层中发现的富锂沉积记录.勘查区内共发现33层锂矿体,厚度为1.09~5.59 m,平均厚度2.32 m,Li2O品位为0.1%~0.42%,平均品位0.16%.富锂层位在冀东地区分布广泛、厚度大、层位稳定,因此,可预测的锂资源潜力巨大,具有重要的经济和理论研究价值.该富锂岩系发育于中元古代雾迷山组,XRD矿物分析、地球化学数据显示其主要矿物组成为白云石,其次为石英和伊蒙混层、伊利石等黏土矿物;富锂岩系具有高CaO、MgO含量和低Al2O3含量的特征;浸出实验结果表明,常温常压下富锂泥质白云岩与稀盐酸在封闭容器中反应可发生>77%的锂元素浸出.与华南地区晚古生代的富锂沉积岩系相比,该富锂岩系在成矿时代、赋矿层位、岩石类型、矿物组成、地化特征和赋存状态上存在显著差异,同时也不同于后者需要在加热条件下才发生锂的有效浸出.上述差异可能与以下原因有关:(1)研究区富锂岩系的成矿物质可能来源于山海关古陆的风化;(2)富锂岩系形成于干旱的碳酸盐岩潮坪‒泻湖环境.因此,冀东雾迷山组富锂岩系的形成不同于前人提出的碳酸盐黏土型锂矿,指示了一种新的锂富集机制和成矿过程,但对该套岩系的锂富集成矿机制还需要进一步研究.
In 2021,the research group discovered the Mesoproterozoic lithium-rich sedimentary series in eastern Hebei Province.This is the first lithium-rich sedimentary record found in the Precambrian strata in China.A total of 33 lithium-rich layers were found in the exploration area,with a thickness of 1.09-5.59 m,an average thickness of 2.32 m,Li2O grade of 0.1%-0.42%,and an average grade of 0.16%.The target layer has wide distribution,huge thickness,stable horizon,and huge lithium resource potential,so it has a huge potential for lithium resources.Lithium-rich sedimentary rocks are developed in the Mesoproterozoic Wumishan Formation.Mineralogical and geochemical analyses show that dolomite is the dominant mineral with subordinate quartz,illite/smectite mixed layer,and illite.The lithium-rich rocks are characterized by high CaO,MgO and low Al2O3 contents.At room temperature and pressure,the reaction of argillaceous dolomite with dilute hydrochloric acid in a closed container can produce>77%lithium leaching.Compared with the Late Paleozoic lithium-rich sedimentary rocks in South China,this type of lithium-rich rocks in North China has significant differences in metallogenic age,ore-bearing succession,lithology,mineral composition,major and trace elements and occurrence state.And it is also different from the former,which requires effective leaching of lithium under heating conditions.These differences are likely related to the likely derivation of the ore-forming materials of lithium-rich rocks in the study area from the weathering of Shanhaiguan ancient land and the deposition in a dry carbonate tidal flat-lagoon environment.Therefore,the formation of the lithium-rich rocks in the Wumishan Formation is different from the previously proposed carbonate clay-type lithium deposits,indicating a new lithium enrichment mechanism.The exact mechanism of lithium enrichment in this rock series still needs to be further studied.
作者
耿晓磊
张晓容
王克冰
刘何凡
赵保强
杨建
米澄宇
李晓峰
杨江海
Geng Xiaoei;Zhang Xiaorong?;Wang Kebing;Liu Hefan;Zhao Baoqiang;Yang Jian;Mi Chengyu;Li Xiaofeng*;Yang Jianghai*(Hebei Institute of Geological Survey,Shijiazhuang O500ll,China 2.School of Earth Sciences,China University of Geosciences(Wuhan),Wuhan 430074,China)
出处
《地球科学》
北大核心
2025年第7期2689-2706,共18页
Earth Science
基金
中央引导地方科技发展资金项目基础研究项目(No.216Z4201G)
国家自然科学基金项目(No.42122015)
河北省战略性关键矿产研究协同创新中心基金项目(No.HGUXT⁃2023⁃8).
关键词
冀东地区
中元古代
雾迷山组
泥质白云岩
富锂岩系
成矿机制
矿床学
eastern Hebei Province
Mesoproterozoic
Wumishan Formation
argillaceous dolomite
clay type lithium
ore metallogenic mechanism
ore deposit
作者简介
耿晓磊(1988-),男,高级工程师,主要从事地质矿产勘查与研究.ORCID:0009⁃0000⁃3138⁃368X.E⁃mail:gengxiaolei2023@163.com;通讯作者:杨江海,ORCID:0000⁃0002⁃5238⁃8655,E⁃mail:yangjh@cug.edu.cn;通讯作者:李晓峰,E⁃mail:lxf9519@163.com。
