文献类型：期刊文献

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 n Central Yunnan [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]

机构：[1]College of Earth Sciences, East China University of Technology, Nanchang, 330013, China;[2]School of Earth Sciences and Resources, Chang'An University, Xi'an, 710054, China;[3]College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China;[4]Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, 650093, China;[5]Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China;[6]College of Mining Engineering, Guizhou Institute of Technology, Guiyang, 550003, China

第一机构：College of Earth Sciences, East China University of Technology, Nanchang, 330013, China

年份：2022

卷号：38

期号：7

起止页码：2080-2094

外文期刊名：Yanshi Xuebao/Acta Petrologica Sinica

收录：Scopus(收录号：2-s2.0-85139195486)

语种：英文

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

摘要：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 o 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 nsights gained from this study will improve the mineralization model of carbonate-hosted clay-type lithium deposit. ? 2022 Science Press. All rights reserved.