文献类型：期刊文献

中文题名：滇中下二叠统倒石头组富锂黏土岩系锂的赋存状态及富集机制研究

英文题名：Study on the occurrence state and enrichment mechanism of lithium in lithium-rich clay rock series of the Daoshitou Formation of Lower Permian in Central Yunnan

作者：崔燚 温汉捷 于文修 罗重光 杜胜江 凌坤跃 徐飞 杨季华

第一作者：崔燚

通信作者：Wen, HJ[1];Wen, HJ[2]

机构：[1]东华理工大学地球科学学院,南昌330013;[2]长安大学地球科学与资源学院,西安710054;[3]中国科学院大学地球与行星科学学院,北京100049;[4]昆明理工大学国土资源工程学院,昆明650093;[5]中国科学院地球化学研究所,矿床地球化学国家重点实验室,贵阳550081;[6]贵州理工学院矿业工程学院,贵阳550003

第一机构：东华理工大学地球科学学院,南昌330013

通信机构：corresponding author), Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China;corresponding author), Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China.

年份：2022

卷号：38

期号：7

起止页码：2080-2094

中文期刊名：岩石学报

外文期刊名：Acta Petrologica Sinica

收录：CSTPCD;;Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000878167100015)】；北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：国家自然科学基金项目(92162214、41773015、U1812402、41903038);国家重点研发计划项目(2017YFC0602500);云南省重点研发计划项目(202103AQ100003)联合资助.

语种：中文

中文关键词：锂;碳酸盐岩;黏土矿物;风化作用;赋存状态;滇中

外文关键词：Lithium;Carbonate;Clay minerals;Weathering;Occurrence;Central Yunnan

摘要：战略性关键金属锂是重要的新能源金属。近期发现的碳酸盐黏土型锂矿床具有储量大、开采成本低等特点,将成为我国锂矿资源开发的又一重要方向。然而,该新发现的锂矿床存在锂的赋存状态和富集机制不明的问题,严重阻碍了对该类型锂资源的评价、预测及综合开发利用。本文以西南地区滇中碳酸盐黏土型锂矿为研究对象,利用X射线衍射(XRD)、扫描电镜-能谱(SEM-EDX)分析了富锂黏土岩的矿物成分和形态。在此基础上,采用聚焦离子束(FIB)切片结合飞行时间二次离子质谱仪(TOF-SIMS)的方法分析了富锂黏土岩微米尺度上的元素分布特征。结果表明,Li的富集区域与Si和Mg吻合,指示Li的载体矿物为富Mg黏土矿物。基于透射电镜(TEM)和能谱(TEM-EDX)分析了FIB切片横截面纳米尺度上的元素分布和矿物组成特征,鉴定出富Li矿物为蒙皂石或锂绿泥石。综合滇中碳酸盐黏土型锂矿的地质背景、矿物学和地球化学特征,推测碳酸盐岩风化过程中形成了Li的载体矿物——蒙皂石,蒙皂石在风化-沉积过程中结合Li,并在成岩阶段转化为锂绿泥石。本研究获得的认识进一步丰富和完善了碳酸盐黏土型锂矿的成矿模型。
Lithium is a critical metal and is widely used in new energy industry.The newly discovered carbonate-hosted clay-type lithium deposit has the characteristics of large reserves and low mining cost,which make it to be another potential lithium exploration direction in our country.However,its occurrence state and enrichment mechanism are still unclear,which hinders the evaluation,prediction and comprehensive utilization of this type of lithium deposit.In this study,carbonate-hosted clay-type lithium deposit in Central Yunnan,Southwest China was selected as research object.Samples were analyzed using X-ray diffraction(XRD)and scanning electron microscopy equipped with energy dispersive X-ray analysis(SEM-EDX)to investigate the composition and morphology of minerals in Li-rich clay rocks.In addition,focused-ion-beam(FIB)and time-of-flight secondary ion mass spectrometry(TOF-SIMS)were employed to characterize elemental distribution at micron-scale.Analysis results show that Li has a strong positive correlation with Si and Mg,indicating that the carrier of Li is Mg-rich clay mineral.FIB cross sections were analyzed using a transmission electron microscope(TEM)equipped with EDX to assess the elemental distribution and mineral composition at nano-scale in Li-rich clay rocks.As a result,smectite and/or cookeite were identified as the carrier of Li.We propose that smectite formed during weathering-depositional processes could incorporate a large amount of Li and then transformed into cookeite during burial diagenesis.New insights gained from this study will improve the mineralization model of carbonate-hosted clay-type lithium deposit.