冀北中生代火山沉积盆地锂异常成因初探——以森吉图盆地为例  

Preliminary study on the origin of lithium anomaly in the Mesozoic volcanic sedimentary basin of northern Hebei Province——A case study of the Senjitu Basin

作　　者：代永刚 师淑娟 裴尧[2] 孟庆杰 李冉 丁赛 叶天阳 高亮 DAI Yonggang;SHI Shujuan;PEI Yao;MENG Qingjie;LI Ran;DING Sai;YE Tianyang;GAO Liang(Hebei Institute of Geophysical Exploration(Shallow Geothermal Energy Research Center of Hebei Province),Langfang 065000,Hebei,China;College of Geoscience Science and Technology,Jilin University,Changchun 130026,Jilin,China)

机构地区：[1]河北省地球物理勘查院(河北省浅层地热能研究中心),河北廊坊065000 [2]吉林大学地球探测科学与技术学院,吉林长春130026

出　　处：《矿产勘查》2023年第2期174-182,共9页Mineral Exploration

基　　金：河北省地质矿产开发局科研项目(454-0601-YBN-W1P6)资助。

摘　　要：冀北地区中生代火山盆地中存在多处锂的超常富集,其中的森吉图盆地主要富锂层位为下白垩统九佛堂组,岩性为页岩、粉砂岩等富含黏土矿物的岩石组合,受沉积层位控制明显。通过REE、Sr、Ga、B、Cu/Zn、Ce_(anom)等微量元素参数进行物源及沉积环境判别认为,锂主要源自下伏地层下白垩统张家口组和大北沟组富锂的火山沉积岩,在白垩纪暖湿气候条件下,经风化淋滤和热液萃取后在还原闭塞的淡水湖相盆地中富集最终形成锂异常。研究成果对沉积型锂矿床的资源潜力预测有指导意义。There are much supernormal enrichment of lithium in the Mesozoic volcanic basins in Northern Hebei Province. The main lithium-rich horizon in Senjitu Basin is the Early Cretaceous Jiufotang Formation, and the lithology is shale, siltstone which is rich in clay minerals. Lithium anomaly is obviously controlled by sedimentary horizon. Based on the trace element parameters such as REE, Sr, Ga, B, Cu/Zn and Ce_(anom), it is concluded that lithium mainly originated from Li-rich volcanic sediments of the Zhangjiakou and Dabeigou Formations in the Lower Cretaceous. After weathering, leaching and hydrothermal extraction, lithium in lithium-rich rocks is enriched in reduced and closed freshwater lacustrine basins during the warm and wet climate conditions of Cretaceous period.

关 键 词：中生代 火山沉积盆地 锂 异常成因 物质来源 

分 类 号：P595[天文地球—地球化学]