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LA-ICP-MS锆石微区U-Pb定年方法及不同束斑直径对年龄结果的影响作用探讨

王森 张拴宏 张琪琪 梁霞 孔令昊 胡国辉 王开 王宏宇 蔡瑜杭

王森, 张拴宏, 张琪琪, 等, 2022. LA-ICP-MS锆石微区U-Pb定年方法及不同束斑直径对年龄结果的影响作用探讨. 地质力学学报, 28 (4): 642-652. DOI: 10.12090/j.issn.1006-6616.2021140
引用本文: 王森, 张拴宏, 张琪琪, 等, 2022. LA-ICP-MS锆石微区U-Pb定年方法及不同束斑直径对年龄结果的影响作用探讨. 地质力学学报, 28 (4): 642-652. DOI: 10.12090/j.issn.1006-6616.2021140
WANG Sen, ZHANG Shuanhong, ZHANG Qiqi, et al., 2022. In-situ zircon U-Pb dating method by LA-ICP-MS and discussions on the effect of different beam spot diameters on the dating results. Journal of Geomechanics, 28 (4): 642-652. DOI: 10.12090/j.issn.1006-6616.2021140
Citation: WANG Sen, ZHANG Shuanhong, ZHANG Qiqi, et al., 2022. In-situ zircon U-Pb dating method by LA-ICP-MS and discussions on the effect of different beam spot diameters on the dating results. Journal of Geomechanics, 28 (4): 642-652. DOI: 10.12090/j.issn.1006-6616.2021140

LA-ICP-MS锆石微区U-Pb定年方法及不同束斑直径对年龄结果的影响作用探讨

doi: 10.12090/j.issn.1006-6616.2021140
基金项目: 

国家重点研发计划项目 2018YFC0603802

中国地质科学院地质力学研究所中央财政科研项目结余经费新开项目 No.54

详细信息
    作者简介:

    王森(1986—),男,副研究员,从事区域地质、构造地质学及同位素年代学研究。E-mail: wangsen_cug@163.com

  • 中图分类号: P597

In-situ zircon U-Pb dating method by LA-ICP-MS and discussions on the effect of different beam spot diameters on the dating results

Funds: 

he National Key Research and Development Program Project 2018YFC0603802

the Fundamental Research Funds of the Institute of Geomechanics, Chinese Academy of Geological Sciences No.54

  • 摘要: 利用自然资源部古地磁与古构造重建重点实验室新引进的GeoLas HD型193nm ArF准分子激光剥蚀系统和Agilent 7900型四极杆电感耦合等离子质谱仪,成功建立了LA-ICP-MS锆石微区U-Pb定年及微量元素分析测试方法。以标准锆石91500为外标,在32 μm束斑直径、5.0 J/cm2能量密度和5 Hz剥蚀频率等实验条件下,对Plešovice、Temora1和Qinghu锆石标样开展了U-Pb定年实验,所测年龄结果与各标样推荐值在误差范围允许的条件下一致,并且Plešovice年龄结果在不同时间段内保持稳定。同时对未知年龄样品11-5开展了不同实验室测年结果对比研究,所测结果与中国地质大学(武汉)地质过程与矿产资源国家重点实验室所测年龄在误差允许范围内一致。以NIST SRM 610为外标,29Si为内标,分析测试了锆石91500和NIST SRM 612标准样品的微量元素含量,实验测试结果与推荐值一致。在此基础上探索总结了不同剥蚀斑束直径对U-Pb年龄结果的影响,认为在同样的能量密度和剥蚀频率条件下,16~44 μm的剥蚀直径可以获取可靠的锆石U-Pb年龄,但32~44 μm相比16~24 μm小斑束直径所测得的年龄更加精准。

     

  • 图  1  不同时间段Plešovice锆石U-Pb谐和图和年龄加权平均值

    Figure  1.  U-Pb concordia plot and weighed mean age of the zircon Plešovice in different periods

    图  2  Temora1锆石U-Pb谐和图及年龄加权平均值

    (a)U-Pb谐和图;(b)年龄加权平均值

    Figure  2.  U-Pb concordia plot and weighed mean age of the zircon Temora1

    (a) U-Pb concordia plot; (b) Weighed mean age

    图  3  Qinghu锆石U-Pb谐和图及年龄加权平均值

    (a)U-Pb谐和图;(b)年龄加权平均值

    Figure  3.  U-Pb concordia plot and weighed mean age of the zircon Qinghu

    (a) U-Pb concordia plot; (b) Weighed mean age

    图  4  样品11-5不同实验室U-Pb年龄对比图

    a—自然资源部古地磁与古构造重建重点实验室测试结果;b—中国地质大学(武汉)地质过程与矿产资源国家重点实验室测试结果

    Figure  4.  Comparison of U-Pb concordia plot for sample 11-5 from different Laboratories

    (a) Results from the Key Laboratory of Paleomagnetism and Tectonic Reconstruction; (b) Results from the State Key Laboratory of Geological Processes and Mineral Resources

    图  5  锆石91500和NIST SRM612标样稀土元素球粒陨石标准化配分模式图(球粒陨石标准值据Sun and McDonough, 1989;91500锆石的微量元素平均含量的参考值据王岚等,2012)

    Figure  5.  Chondrite-normalized REEs patterns of the standard sample 91500 and NIST SRM612 (Chondrite-normalized values are cited from Sun and McDonough, 1989; reference values of trace elements for zircon 91500 are cited from Wang et al., 2012)

    图  6  不同斑束直径剥蚀取样获得的Plešovice U-Pb谐和图及年龄加权平均值

    Figure  6.  U-Pb concordia plot and weighed mean age of the zircon Plešovice obtained by different beam spot diameters

    图  7  不同时间段内24 μm斑束直径获得的Plešovice U-Pb年龄加权平均值

    Figure  7.  Weighed U-Pb mean ages of the zircon Plešovice with the 24 μm beam spot diameter in different periods

    表  1  LA-ICP-MS主要工作参数

    Table  1.   Major working parameters of the LA-ICP-MS

    激光剥蚀系统
    (GeoLasHD 193 nm ArF准分子)
    电感耦合等离子质谱系统
    (Agilent 7900)
    分析参数 工作条件 分析参数 工作条件
    工作波长 193 nm 等离子气流 15 L/min
    能量密度 5 mJ/cm2 RF功率 1550 W
    剥蚀频率 5 Hz RF匹配 1.8 V
    采样时间 50 s 采样深度 6.0 mm
    束斑直径 44/32/24 μm 载气流速 0.6~0.9 L/min
    载气类型 100% 氦气 分析同位素 202、204、206~208、232、238
    载气流速 0.4 L/min 积分时间 25~30 ms/同位素
    下载: 导出CSV
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