锂同位素示踪表生风化与环境演变:回顾与展望  

Lithium Isotopes for Tracing the Supergene Weathering and Environmental Evolution: Review and Prospective

作　　者：杨承帆 杨守业[1] 苟龙飞 王晓丹[1] 李亚龙 YANG Cheng-fan;YANG Shou-ye;GOU Long-fei;WANG Xiao-dan;LI Ya-long(State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710061,China)

机构地区：[1]同济大学海洋地质国家重点实验室,上海200092 [2]中国科学院地球环境研究所,黄土与第四纪地质国家重点实验室,西安710061

出　　处：《矿物岩石地球化学通报》2018年第5期841-851,共11页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目(41730531)

摘　　要：过去几十年,锂同位素被广泛用于示踪大陆硅酸盐岩风化,除通过模拟实验探讨锂同位素分馏机制外,表生过程锂同位素研究主要集中在以下几方面:流域溶解态和颗粒态锂同位素变化特征及其对全球锂循环的影响、示踪流域风化及沉积再旋回过程;风化剖面的锂同位素分馏机制,以及利用沉积岩心和其他地质记录的锂同位素组成来重建地史时期风化和古环境演变,包括极端事件及其过程。近些年来,锂同位素研究的热点包括:锂与其他同位素指标的耦合联用示踪,自生碳酸盐岩或海洋生物壳体的锂同位素记录,以及借助锂同位素探究新生代甚至更长时间尺度的构造-气候-风化事件。虽然我国在表生过程锂同位素的研究开始并不晚,但目前与国际前沿水平仍存在较大差距,无论基础理论、分馏机制抑或示踪应用等方面尚处于探索阶段。In past decades,Li isotopes have been widely applied to investigate the weathering of continental silicates.In addition to the laboratory experimental simulation to explore the Li isotopic fraetionation mechanism,The current researches on Li isotopes of supergene processes mostly focus on the following aspeets.(1)The spatial and temporal variation characteristics of Li isotopes of lithium in dissolved and suspended particulate states in rivers,and their applications for tracing processes of global Li cycling,weathering in the drainage basin,and sedimentary recycling;(2)The Li isotopic fractionation mechanisms in modern weathering profiles,reconstruction processes of paleo-weathering and paleo-environmental evolution,including extreme events,by using Li isotopic compositions of sedimentary cores and other geologic archives,and the indication for paleoclimate changes over the geologic past.In recent years,hotspots of the Li isotope researches in the world include the coupling tracer of lithium with other isotopic indices,records of Li isotopes in autogenous carbonates or marine shells,and investigations of the tectonic-climate-weathering events in Cenozoic and even longer time scale by using lithium isotopes.Although it is not too late to start the research on Li isotopes in the supergene process in China,there is still a large gap with the international frontier level at present,no matter the basic theory,fraetionation mechanism or tracer application are still in the exploratory stage.

关 键 词：锂同位素 同位素分馏 化学风化 表生过程 示踪运用 环境演变 

分 类 号：P595[天文地球—地球化学]