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    多离子计数器动态多接收方式锆石Pb同位素比值高精度测定方法

    王伟 储著银 李潮峰 刘文贵 许俊杰 郭敬辉

    王伟, 储著银, 李潮峰, 刘文贵, 许俊杰, 郭敬辉, 2020. 多离子计数器动态多接收方式锆石Pb同位素比值高精度测定方法. 地球科学, 45(6): 1977-1985. doi: 10.3799/dqkx.2019.285
    引用本文: 王伟, 储著银, 李潮峰, 刘文贵, 许俊杰, 郭敬辉, 2020. 多离子计数器动态多接收方式锆石Pb同位素比值高精度测定方法. 地球科学, 45(6): 1977-1985. doi: 10.3799/dqkx.2019.285
    Wang Wei, Chu Zhuyin, Li Chaofeng, Liu Wengui, Xu Junjie, Guo Jinghui, 2020. High-Precision Pb Isotope Ratio Determination of Zircon By Multi-Ion Counter TIMS with Multi-Dynamic Collection Method. Earth Science, 45(6): 1977-1985. doi: 10.3799/dqkx.2019.285
    Citation: Wang Wei, Chu Zhuyin, Li Chaofeng, Liu Wengui, Xu Junjie, Guo Jinghui, 2020. High-Precision Pb Isotope Ratio Determination of Zircon By Multi-Ion Counter TIMS with Multi-Dynamic Collection Method. Earth Science, 45(6): 1977-1985. doi: 10.3799/dqkx.2019.285

    多离子计数器动态多接收方式锆石Pb同位素比值高精度测定方法

    doi: 10.3799/dqkx.2019.285
    基金项目: 

    国家自然科学基金项目 41673061

    中国科学院仪器设备功能开发项目 IGG201803

    详细信息
      作者简介:

      王伟(1993-), 男, 硕士研究生, 主要从事CA-ID-TIMS U-Pb年代学工作

      通讯作者:

      储著银

    • 中图分类号: P597+.3

    High-Precision Pb Isotope Ratio Determination of Zircon By Multi-Ion Counter TIMS with Multi-Dynamic Collection Method

    • 摘要: 采用装配多离子计数器系统的TRITON Plus热电离质谱仪(thermal ionization mass spectrometer,TIMS),建立了多离子计数器动态多接收锆石Pb同位素(以205Pb为稀释剂)测定方法.相对多离子计数器静态多接收方法,该方法完全消除了不同离子计数器间增益差异对锆石Pb同位素测定的影响.相对传统的单个二次电子倍增器(secondary electron multiplier,SEM)五次跳峰的锆石Pb同位素测定方法,该方法两次跳峰即可测定全部Pb同位素比值,Pb同位素离子流接收效率提高2.5倍,同时,降低了离子流稳定性对Pb同位素分析结果的影响.为验证方法的可靠性,对加入205Pb稀释剂的NIST981 Pb标准和标准锆石清湖(Qinghu)进行了测定.对5×10-11 g 205Pb-NIST981 Pb混标,207Pb/206Pb测定精度达到0.079%(2RSD,n=20);对清湖标准锆石,获得的年龄结果为159.51±0.11 Ma(2SE,n=7;MSWD=1.1),与文献报道值在误差范围内一致.

       

    • 图  1  TRITON PLUS热电离质谱仪多离子计数器系统配置示意

      Fig.  1.  Schematic diagram of multi-ion counter array for TRITON PLUS TIMS

      图  2  TRITON PLUS离子计数器系统不同测定方式NIST981 207Pb/206Pb测定结果对比

      *图中实线代表平均值, 虚线代表平均值±2SD的范围

      Fig.  2.  Comparison of analytical results for 207Pb/206Pb of NIST981 with different measurement methods using TRITON PLUS TIMS MIC system

      图  3  清湖锆石U⁃Pb年龄测定结果

      Fig.  3.  Analytical results of U⁃Pb date for Qinghu zircon

      表  1  TRITON PLUS热电离质谱仪多离子计数器Pb同位素分析接收器配置

      Table  1.   TRITON PLUS TIMS MIC configuration for Pb isotopic measurement

      Center Mass IC3 A (SEM) IC2 L5 (SEM) RPQ/IC1 B
      (SEM)
      IC5
      (CDD)
      Integration Time(s) Idle Time(s)
      Main 222.93 205Pb 206Pb 207Pb 208Pb 4 1
      Second 221.86 204Pb 205Pb 206Pb 207Pb 4 1
      下载: 导出CSV

      表  2  多离子计数器Yield测试接收器配置

      Table  2.   MICC on figuration for Yield test of multiple ion counters

      Line IC4⁃L5 IC3 A IC2 L5 RPQ/IC1 B IC5 L4 C Integration Time(s) Idle Time(s)
      1 208Pb 4 3
      2 207Pb 208Pb 224.00 4 3
      3 208Pb 225.08 4 3
      4 208Pb 226.13 4 3
      5 208Pb 227.20 4 3
      6 204Pb 205Pb 206Pb 207Pb 208Pb 222.93 4 3
      下载: 导出CSV

      表  3  MIC动态多接收205Pb⁃NSIT981混合溶液Pb同位素比值测定结果

      Table  3.   Analytical results for Pb isotope ratio of 205Pb⁃NSIT981 mixed solution using MIC multi⁃dynamic method

      跳峰接收方式
      Sample
      MIC两次跳峰动态接收
      207Pb/206Pb 2RSE(%) 208Pb/206Pb 2RSE(%) 204Pb/206Pb 2RSE(%)
      1 0.913 54 0.046 2.162 4 0.048 0.059 14 0.075
      2 0.913 60 0.031 2.160 8 0.034 0.058 85 0.053
      3 0.913 93 0.052 2.161 6 0.052 0.059 15 0.093
      4 0.913 35 0.036 2.162 6 0.039 0.058 90 0.063
      5 0.912 97 0.031 2.160 9 0.032 0.058 94 0.045
      6 0.913 07 0.028 2.150 7 0.030 0.059 11 0.051
      7 0.913 94 0.048 2.155 8 0.050 0.059 11 0.070
      8 0.913 50 0.036 2.154 9 0.037 0.059 16 0.058
      9 0.913 32 0.038 2.155 1 0.041 0.059 15 0.073
      10 0.913 72 0.039 2.156 0 0.042 0.059 18 0.065
      11 0.913 99 0.043 2.156 1 0.044 0.059 13 0.070
      12 0.914 04 0.042 2.159 1 0.045 0.059 13 0.062
      13 0.913 19 0.059 2.157 7 0.061 0.059 17 0.079
      14 0.913 30 0.061 2.152 0 0.063 0.059 24 0.094
      15 0.912 86 0.026 2.157 3 0.027 0.058 99 0.044
      16 0.912 98 0.025 2.160 0 0.027 0.059 00 0.039
      17 0.913 31 0.049 2.152 8 0.051 0.059 14 0.074
      18 0.913 81 0.042 2.156 8 0.043 0.059 06 0.076
      19 0.913 50 0.045 2.156 4 0.046 0.059 09 0.068
      20 0.913 66 0.045 2.150 9 0.046 0.059 09 0.070
      Mean 0.913 48 ± 0.000 72(2SD) 2.157 0± 0.007 3(2SD) 0.059 09 ± 0.000 20(2SD)
      注:RSE:相对标准误差;SD:标准偏差,下同;(RSE:relative standard error; SD:standard deviation,the same below).
      下载: 导出CSV

      表  4  清湖锆石年龄测定结果

      Table  4.   Analytical results for Qinghu standard zircon

      分析点 Pbc
      (pg)
      Pb*/
      Pbc
      Th/
      U
      206Pb/
      204Pb
      208Pb/
      206Pb
      同位素比值 年龄
      206Pb/
      238U

      (%)
      207Pb/
      235U

      (%)
      207Pb/
      206Pb

      (%)
      206Pb/
      238U
      (Ma)

      (%)
      207Pb/
      235U
      (Ma)

      (%)
      207Pb/
      206Pb
      (Ma)
      相关误差
      QH⁃1 5.5 13.1 0.40 812 0.170 4 0.025 03 0.16 0.170 5 1.0 0.049 43 0.23 159.37 0.16 159.86 0.92 168 0.08
      QH⁃2 6.6 5.7 0.38 364 0.216 9 0.025 05 0.24 0.169 8 2.2 0.049 19 0.22 159.48 0.24 159.3 2.0 157 0.05
      QH⁃3 5.2 19.5 0.48 1 173 0.183 3 0.025 04 0.17 0.170 94 0.69 0.049 52 0.12 159.46 0.17 160.23 0.64 173 0.15
      QH⁃4 3.3 41.9 0.42 2 551 0.146 3 0.025 05 0.16 0.171 22 0.38 0.049 59 0.13 159.51 0.16 160.47 0.35 176 0.23
      QH⁃5 5.0 4.7 0.44 300 0.256 1 0.025 07 0.28 0.171 0 2.7 0.049 48 0.36 159.61 0.28 160.3 2.5 171 0.05
      QH⁃6 4.3 10.6 0.41 660 0.184 2 0.025 09 0.20 0.170 4 1.2 0.049 26 0.21 159.76 0.20 159.7 1.1 160 0.11
      QH⁃7 3.6 5.6 0.35 361 0.210 8 0.025 10 0.24 0.168 9 2.3 0.048 81 0.61 159.81 0.24 158.4 2.1 139 0.04
      注:(1)Pbc代表普通铅, 本文认为其来自实验室本底,*Pb代表放射性成因铅;(2)采用实验室长期Pb本底同位素比值测定结果: 206Pb/204Pb=17.78±0.50 (2σ),207Pb/204Pb =15.31±0.34 (2σ), 进行本底扣除计算;(3)205Pb⁃235U稀释剂采用NIST981 Pb及GBW04205 U3O8配制的标准溶液标定,稀释剂U/Pb比标定误差~0.18%(2RSE).
      下载: 导出CSV
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    • 收稿日期:  2019-10-28
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