广西晚二叠世煤系沉积型锂矿研究现状及展望  

Research Status and Prospect of Sedimentary Lithium Resources of Late Permian Coal Measure in Guangxi

作　　者：廖家隆 李宝庆[2] 张福强 庄新国[2] Liao Jialong;Li Baoqing;Zhang Fuqiang;Zhuang Xinguo(Guangxi Bureau of Coal Geological Exploration,CNACG,Nanning,Guangxi 530299;China University of Geosciences,Wuhan,Hubei 430074)

机构地区：[1]中国煤炭地质总局广西煤炭地质局,南宁530299 [2]中国地质大学,武汉430074

出　　处：《中国煤炭地质》2022年第10期9-14,共6页Coal Geology of China

基　　金：广西自然科学基金面上项目(2018JJA150165)。

摘　　要：广西晚二叠世煤系广泛存在锂元素超常富集现象,具有寻找煤系沉积型锂矿的良好前景。在广西煤系锂资源调查的基础上,结合以往资料,对晚二叠世煤系中锂资源的赋存分布规律和富集机理进行了探讨。研究表明,广西煤系锂资源主要分布于桂中、桂西、桂西南一带,富集层位集中于上二叠统合山组底部的煤、炭质泥岩、泥岩或铁铝质泥岩中;锂的主要载体矿物为黏土矿物(如锂绿泥石、高岭石、绿泥石、蒙脱石等);富锂异常的形成与广西南部大新古陆、早二叠世古风化壳和晚二叠世海浸密切相关;锂的来源可能主要有随陆源黏土碎屑带入和富锂卤水,其形成过程包括早二叠世基底岩石黏土岩化-铝土岩化,晚二叠世海侵-沉积成岩演化。由于以往煤田勘探没有规范和系统的锂资源勘探成果资料和煤系沉积型锂矿开发利用理论研究不够深入,因此,需要进一步加强煤系中锂资源的赋存分布规律和富集机理研究,为煤系沉积型锂矿的勘探和资源预测提供科学理论依据。Supernormal enrichment of lithium is widespread in coal measures of late Permian in Guangxi,which has a good prospect of looking for coal-based sedimentary lithium deposits.Based on the investigation of lithium resources in coal measures in Guangxi,combined with the previous data,the distribution and enrichment mechanism of lithium resources in late Permian coal measures are discussed.The research results show that the lithium resources of coal measures in Guangxi are mainly distributed in central,Western and Southwest Guangxi,and the enrichment layers are concentrated in the coal,carbonaceous mudstone,bauxite or ferroaluminous mudstone at the bottom of the Heshan formation of the upper Permian.The main carrier minerals of lithium are clay minerals(such as cookeite,kaolinite,chlorite,montmorillonite etc.).The formation of lithium-rich anomalies is closely related to the Daxin paleo-land,early Permian paleo-weathering crust and late Permian marine transgression in southern Guangxi.Sources of lithium may mainly be brought from terrigenous clay detritus and lithium-rich brine,and their formation process include the evolution from argillation to aluminization of early Permian basement rocks,and late Permian transgression-sedimentary diagenesis evolution.Since there is no standard and systematic data of lithium resources exploration in coal field exploration in the past,and the theoretical research on the development and utilization of coal measures sedimentary lithium deposits is not in-deep enough,therefore,it is necessary to further strengthen the study of the occurrence,distribution and enrichment mechanism of lithium resources in coal measures,so as to provide scientific and theoretical basis for exploration and resource prediction of coal-based sedimentary lithium deposits.

关 键 词：沉积型锂矿 合山组 黏土矿物 开发利用 

分 类 号：P618.71[天文地球—矿床学]