Lithium Isotope Analytical Methods and Implications for Rare-Metal Mineralization in Granite-Pegmatite Systems:An Overview  

作　　者：Xiangying Ye Bin Li Dongbo Tan Kecheng Liu Zhiyong Zhu Hafiz Muhammad Siddique Yilin Xiao 

机构地区：[1]Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Ministry of Education),School of Geosciences and Info-physics,Central South University,Changsha,410083,China [2]CAS Key Laboratory of Crust-Mantle Materials and Environments,School of Earth and Space Sciences,University of Science and Technology of China,Hefei,230026,China [3]Department of Earth Sciences,University of Oxford,Oxford,OX13AN,UK [4]Institute of Geology,Chinese Academy of Geological Sciences,Beijing,100037,China [5]Chinese Academy of Sciences Center of Excellence in Comparative Planetology,Hefei,230026,China [6]CAS Key Laboratory of Geospace Environment and Department of Plasma Physics and Fusion Engineering,University of Science and Technology of China,Hefei,230026,China

出　　处：《Journal of Earth Science》2024年第6期1878-1894,共17页地球科学学刊（英文版）

基　　金：funded by the National Natural Science Foundation of China(Nos.42372105,42073001,42073003);the Hunan Science and Technology Innovation Program(No.2021RC4055);the Central South University Innovation-Driven Plan Project(No.2019CX035)。

摘　　要：The origin of highly-fractionated granite-pegmatite systems and their associated rare metal mineralization has been widely studied,but there is still ongoing debate.Prevailing hypotheses suggest that pegmatite formation and the associated rare metal mineralization are closely related to aqueous fluid processes.Lithium(Li)isotope analysis has been widely applied to trace granite-pegmatite evolution.This is because lithium is widely present in various minerals(e.g.,mica,tourmaline)that record the melt and fluid compositions,and lithium isotopes are sensitive to magmatic-hydrothermal processes.We briefly review the methodology of Li isotope analyses,the mechanisms of Li isotopic fractionation,and,in particular,Li isotope fractionation in granite-pegmatite system based on Li isotope data we have collected and the latest developments in Li isotope geochemistry.With the development of analytical technology,high-precision measurement of the Li content and isotopic compositions have facilitated a series of scientific breakthroughs in understanding the magmatic-hydrothermal evolution of rareelement ore deposits.Li isotope analyses on bulk mineral separates have demonstrated their ability to trace various hydrothermal processes.In situ Li isotope analysis methods has been enhanced by the development of new,homogeneous mineral reference materials.In situ SIMS and LA-MC-ICP-MS Li isotope measurements on minerals(e.g.,tourmaline)will likely become more important in studying the fluid-rock interactions in magmatic,metamorphic,and hydrothermal processes,as well as on pegmatite petrogenesis and rare-metal mineralization.

关 键 词：lithium ISOTOPES granitic-pegmatite system magmatic-hydrothermal evolution rare-metal deposits 

分 类 号：P618.6[天文地球—矿床学]