基于激光熔融制样分析玄武质无球粒陨石的主、微量元素  

Analysis of major and trace elements in basaltic achondrite based on laser fusion

作　　者：贺文忠 廖世勇 徐伟彪[1,2,3,4] HE Wen-zhong;LIAO Shi-yong;HSU Wei-biao(Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China;School of Astronomy and Space Sciences,University of Science and Technology of China,Hefei 230026,China;CAS Center for Excellence in Comparative Planetology,University of Science and Technology of China,Hefei 230026,China;Institute of Deep Space Science,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院紫金山天文台,南京210023 [2]中国科学技术大学天文与空间科学学院,合肥230026 [3]中国科学院比较行星学卓越创新中心,合肥230026 [4]深空探测研究院,中国科学技术大学,合肥230026

出　　处：《矿物岩石地球化学通报》2023年第2期340-349,共10页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：中国科学院重点部署项目(ZDBS-SSW-JSC007);国家自然科学基金资助项目(42073060)。

摘　　要：无球粒陨石的主、微量元素组成对于类地行星壳-幔分异和岩浆研究演化具有重要意义。但由于样品稀缺,使用传统方法分析无球粒陨石的全岩主、微量元素组成有较大局限。本文在样品粉末压片的基础上,采用激光熔融制取玻璃,并结合电子探针和激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)对标样和Eucrite样品进行原位分析。结果表明,主量元素中除少数元素(Na、K和P等)外,绝大多数元素的分析准确度都优于5%;微量元素除少数元素外(Ni、Ga、Tb、Tl和U等),绝大多数元素的分析准确度都在5%~10%范围。本方法为低损耗(~30 mg)、快速准确获取具有较高Mg、Fe含量的玄武质无球粒陨石样品全岩的主、微量元素组成提供了一种新的途径。The bulk compositions of major and trace elements of achondrite samples are of great significance for studying the crust-mantle differentiation and magmatic evolution of terrestrial planets.However,the traditional whole-rock analyses of major and trace elements of achondrite samples often have relatively big limitations due to the rarity of samples.In this paper,we have carried out in-situ analyses of major and trace elements of fusion glass pellets,made from pressed powder pellets with an updated laser melting system,by using the electron probe and LA-ICP-MS.The results of standard and basaltic achondrite samples show that analytical accuracy deviations are generally lower than 5%for most major elements with the exception of Na,K and P.The analytical accuracy deviations of most trace elements with the exception of Ni,Ga,Tb,Tl and U are within the range of 5%-10%.This technique provides an new way for efficiently and accurately analyzing the whole-rock composition of basaltic achondrite samples with relatively high Mg and Fe contents at a very low level of consumption(<30 mg).

关 键 词：无球粒陨石 粉末压片 激光熔融制样 电子探针 全岩主、微量元素 

分 类 号：P148[天文地球—天体物理]