适用于单个流体包裹体LA-ICP-MS分析的多元素流体包裹体标样合成及飞秒激光分析方法建立  

Synthesis of multi-element fluid inclusion standards suitable for the LA-ICP-MS analysis and establishment of the femtosecond laser analytical method

作　　者：蒋子琦 蓝廷广[1] 郭海浩 尚林波[1] 王新松[1] 唐燕文[1] JIANG Zi-qi;LAN Ting-guang;GUO Hai-hao;SHANG Lin-bo;WANG Xin-song;TANG Yan-wen(State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China;School of Earth Sciences,China University of Geosciences(Wuhan),Wuhan 430074,China)

机构地区：[1]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 [2]中国地质大学(武汉)地球科学学院,武汉430074

出　　处：《矿物岩石地球化学通报》2024年第2期409-417,共9页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家重点研发计划项目(2018YFA0702603,2022YFC2903303);国家自然科学基金资助项目(U1812402,41973059)。

摘　　要：单个流体包裹体成分LA-ICP-MS分析在精准示踪成矿物质来源和精细刻画成矿过程方面具有独特优势,但目前流体包裹体标样的研究还较缺乏,制约了该分析方法的发展和应用。本文通过高温加热-淬火法,结合金刚石磨片打磨和HF酸蚀,在石英中合成了数量多、大小适中且多为规则状/椭圆状的适用于LA-ICP-MS分析的多元素(B、Na、K、Mn、Co、Rb、Sr、Mo、Cs、W)流体包裹体标样。合成的流体包裹体标样冰点相对标准偏差(RSD)小于2%,显示均一性很好。193 nm激光和飞秒激光对该标样进行对比分析,结果显示193 nm激光获得的元素含量相对误差绝大多数(>85%)在±20%以内,RSD变化在5%~17%之间,测试准确度和精度与国际同行实验室相当。飞秒激光获得的元素含量多数(>80%)相对误差在±30%以内,RSD变化在11%~25%之间,准确度和精度比193 nm激光略差,但与国际同行实验室相当甚至更优,表明飞秒激光分析方法是可行的。飞秒激光能够极大地提高流体包裹体分析成功率和效率,具有广泛的应用前景,值得开展深入研究。In-situ elemental analysis of individual fluid inclusions by using the laser ablation-inductively coupled plasma mass spectrometry(LA-ICP-MS)has unique advantages in tracing the sources of ore-forming materials and specifically characterizing mineralization processes.However,the lack of reliable fluid inclusion standards limits its development and application.In this study,by using the heating-quenching method,combined with the diamond grinding and HF etching methods,a large number of multielements-bearing(B,Na,K,Mn,Co,Rb,Sr,Mo,Cs and W)fluid inclusions with regular/elliptical shapes and relatively large sizes have been synthesized in quartz.They are suitable for the LA-ICP-MS analysis and can be used as its analytical standards.Microthermometric results show that freezing temperatures of the synthesized fluid inclusions are varied within a relative standard deviation(RSD)of less than 2%,indicating the excellent homogeneity of those synthesized fluid inclusions.Comparative analyses of those synthesized fluid inclusions have been conducted by using the 193 nm excimer laser ablation and femtosecond laser ablation methods.The results show that their elemental contents obtained by using the 193 nm laser ablation ICP-MS method have mostly relative analytical errors(>85%)within±20%,with RSD values varying from 5% to 17%.The analytical accuracy and precision of this method are comparable to those of the method undertaken in the international peer laboratories.Their elemental contents obtained by using the femtosecond laser ablation ICP-MS method have mostly(>80%)relative analytical errors within±30%,with RSD values varying from 11% to 25%.Although the accuracy and precision of analytical data obtained by using the femtosecond laser ablation ICP-MS method are slightly lower than those of data gained by using the 193 nm laser ablation ICP-MS method,they are comparable or even superior relative to those of the same method undertaken in the international laboratories,demonstrating the feasibility of this newly established

关 键 词：人工合成 流体包裹体 LA-ICP-MS 飞秒激光 

分 类 号：P599[天文地球—地球化学]