飞秒激光-电感耦合等离子体质谱联用系统及固体地球科学应用  

Femtosecond laser and inductively coupled plasma mass spectrometry coupling system and its applications in solid earth science

作　　者：严爽[1,2] 高振丽 杨武斌[1,2] 屈潘 李宁波[1,2] YAN Shuang;GAO Zhenli;YANG Wubin;QU Pan;LI Ningbo(CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China;CAS Center for Excellence in Deep Earth Science,Guangzhou 510640,Guangdong,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院广州地球化学研究所矿物学与成矿学重点实验室/广东省矿物物理与材料重点实验室,广东广州510640 [2]中国科学院深地科学卓越创新中心,广东广州510640 [3]中国科学院大学,北京100049

出　　处：《地球化学》2023年第4期531-546,I0001-I0012,共28页Geochimica

基　　金：中国科学院广州地化所所长基金青年项目(2019SZJJ-08);国家自然科学基金项目(41903016、41930424和42122023);广东省科学技术规划项目(2020B1212060055)联合资助。

摘　　要：中国科学院广州地球化学研究所组建了一套飞秒激光–电感耦合等离子体质谱分析系统(fsLA-ICPMS),该系统由应用光谱公司J200 Tandem QX 343 nm飞秒激光联合赛默飞世尔科技公司iCAP RQ电感耦合等离子体质谱仪组成。通过对飞秒激光硬件和软件进行改进和优化,fsLA-ICPMS分析系统可以全面运行,主要应用于矿物原位微区微量元素分析、矿物二维元素成像分析和高精度矿物原位微区U-Pb定年分析。本研究通过前期条件实验,对fsLA-ICPMS分析系统的分析精度和仪器稳定性进行评估:①在矿物原位微量元素分析方面,对5个不同岩性MPI-DING玻璃中36个微量元素进行分析,结果表明,绝大部分微量元素(含量>1μg/g)测量数据具有较高的稳定性(相对标准偏差RSD<5%)和较好重现性(与推荐值相对偏差RD在±10%以内);对山东烟晶石英标样中Li、Al、Fe、Mn、Ti、Ga和Ge等7个微量元素的分析结果显示,Li、Al、Ti和Ge含量较高(>1μg/g),多次分析信号稳定性较好,RSD<10%,RD在±10%左右,而较低含量的Mn、Fe和Ga数据稳定性相对较差(RSD=20%~40%);②在矿物微区二维元素成像分析方面,选择1颗Plešovice锆石开展多元素含量面扫分析,锆石Sc、Y、Gd、Th、Pb等微量元素具有明显的核–幔–边含量差异,核部具有1颗成分截然的细粒矿物包体;③在矿物原位U-Pb年代学分析方面,分别对副矿物(锆石、榍石、磷灰石)、矿石矿物(褐帘石)和热液蚀变矿物(钙铁铝榴石)开展U-Pb年代学分析,结果显示这些矿物U-Pb同位素年龄都展现出较高的分析精度(内部精度最好可优于0.3%)和准确度。A femtosecond laser ablation system connected with an inductively coupled plasma mass spectrometry(fsLA-ICPMS)has been constructed at the Guangzhou Institute of Geochemistry,Chinese Academy of Sciences.The system comprises Applied Spectroscopy Inc.J200 Tandem QX 343 nm fsLA system and Thermo Fisher Scientific iCAP RQ ICPMS.With the improvement and optimization of the hardware and software of the fsLA system,the fsLA-ICPMS has been fully operational for in-situ trace element analysis,two-dimensional(2D)element imaging analysis,and high-precision in-situ U-Pb geochronology analysis.In this paper,the analytical accuracy and instrument stability of the fsLA-ICPMS are evaluated for the following experiments:(1)For in-situ trace element analysis,concentrations of 36 trace elements in five MPI-DING glasses of different lithologies were analyzed.The results show that most measured trace elements(>0.1μg/g)have high analysis stability(relative standard deviation(RSD)<5%)and good reproducibility(relative deviation(RD)better than±10%).Analysis of seven trace elements(Li,Al,Fe,Mn,Ti,Ga and Ge)in a Shandong smoky quartz reference material indicates that the relatively high concentration(>1μg/g)of Li,Al,Ti,and Ge display good signal stability during multiple analyses with RSD<10%and RD better than±10%,while analysis stability of the low concentration Mn,Fe,and Ga is relatively poor(RSD:20%to 40%).(2)In terms of two-dimension trace element imaging of minerals,a polished Plešovice zircon was selected for multi-element analysis,and Sc,Y,Gd,Th,and Pb concentrations show significant variations from core to mantle to rim,and a tiny(ca.10μm)mineral inclusion with different compositions was found in its core.(3)In-situ U-Pb dating of minerals,including accessory minerals(zircon,titanite,apatite),ore minerals(allanite),and hydrothermal alteration minerals(grandite)were carried out under different laser conditions,and yields U-Pb ages of high precisions(the best internal precisions<0.3%)and accuracy.

关 键 词：飞秒激光–电感耦合等离子体质谱联用 微区分析 微量元素 矿物二维元素成像 U-PB定年 

分 类 号：P579[天文地球—矿物学]