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    高精度质谱计在同位素地球化学的应用前景

    陈福坤 李秋立 李潮峰 李向辉 王秀丽 王芳

    陈福坤, 李秋立, 李潮峰, 李向辉, 王秀丽, 王芳, 2005. 高精度质谱计在同位素地球化学的应用前景. 地球科学, 30(6): 639-645.
    引用本文: 陈福坤, 李秋立, 李潮峰, 李向辉, 王秀丽, 王芳, 2005. 高精度质谱计在同位素地球化学的应用前景. 地球科学, 30(6): 639-645.
    CHEN Fu-kun, LI Qiu-li, LI Chao-feng, LI Xiang-hui, WANG Xiu-li, WANG Fang, 2005. Prospect of High Precision Mass Spectrometer in Isotope Geochemistry. Earth Science, 30(6): 639-645.
    Citation: CHEN Fu-kun, LI Qiu-li, LI Chao-feng, LI Xiang-hui, WANG Xiu-li, WANG Fang, 2005. Prospect of High Precision Mass Spectrometer in Isotope Geochemistry. Earth Science, 30(6): 639-645.

    高精度质谱计在同位素地球化学的应用前景

    基金项目: 

    国家自然科学基金项目 40372106

    国家自然科学基金项目 40403008

    详细信息
      作者简介:

      陈福坤(1964—),男,博士,研究员,同位素地球化学专业.E-mail: fukun_chen@mail.igcas.ac.cn

    • 中图分类号: P597

    Prospect of High Precision Mass Spectrometer in Isotope Geochemistry

    • 摘要: 微量地质样品的高精度同位素比值测试已经成为地质和环境科学等领域极其重要的研究手段.新型固体热电离质谱计以其高精度和高灵敏度, 将在同位素年代学和地球化学领域有广阔的应用前景.报道采用IsoProbeT质谱计测量标准物质溶液的结果.测量锶标准物质NBS987和钕标准物质Ames分别获得平均87Sr/86Sr比值0.710 241 8±0.000 005 1和平均143Nd/144Nd比值0.512 148 4±0.000 002 9, 内部精度可达0.000 3%.微量锶标准物质(0.3~1 ng) 的同位素比值测量内部精度可以优于0.003%.结合低本底化学流程, 实现了微量地质样品的高精度同位素比值测试.这一结合将有效地促进单颗粒矿物年代学和同位素示踪在岩浆岩、变质岩、矿床、构造岩研究的应用.

       

    • 图  1  IsoProbe-T质谱计17个接收器分布

      Fig.  1.  Array of seventeen receivers of the IsoProbe-T mass spectrometer

      图  2  Sr和Nd标准物质溶液的测量结果(NBS987和Ames)

      Fig.  2.  Analytical data of Sr and Nd standard material solutions

      图  3  锆石Pb-Pb蒸发法分析结果

      a.锆石颗粒1测量过程中206Pb信号强度变化; b.锆石颗粒1测得的207Pb/206Pb比值; c.锆石颗粒1测得的208Pb/206Pb比值变化; d.锆石颗粒2测得的207Pb/206Pb比值变化, 指示核边结构或复杂的锆石结晶历史

      Fig.  3.  Analytical data using the zircon Pb-Pb evaporation method

      图  4  低本底高温高压蒸汽法溶样

      Fig.  4.  Low-blank vapor digestion method under high-temperature and high-pressure conditions

      图  5  微量Sr标准物质溶液NBS987同位素比值测量结果

      Fig.  5.  Analytical data using a small amount of the Sr standard material solution NBS987

      表  1  标准物质溶液NBS987 Sr测量结果

      Table  1.   Analytical data of the Sr standard material solution NBS987

      表  2  标准物质溶液Ames Nd测量结果

      Table  2.   Analytical data of the Nd standard material solution Ames

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    出版历程
    • 收稿日期:  2005-07-18
    • 刊出日期:  2005-11-25

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