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稀有气体质谱40Ar-39Ar定年分析技术研究进展

Progress of the Rare Gas Mass Spectrometry Technique for 40Ar-39Ar Dating

    摘要
  • 摘要: 稀有气体质谱分析技术是获得高精度40Ar-39Ar定年数据的基本前提。本文对国内外稀有气体质谱分析技术的发展进行了综述，并分析了稀有气体质谱分析技术在40Ar-39Ar应用领域遇到的问题，提高多接收稀有气体质谱仪的灵敏度和分辨率依然是未来推动40Ar-39Ar定年技术进步的重要手段。同时，围绕稀有气体质谱仪，建立样品激光熔融气体提取和激光原位微区气体提取技术，组建极低本底、紧凑型气体纯化系统，对于发挥稀有气体质谱仪40Ar-39Ar定年样品测试的优势至关重要。这些措施都是40Ar-39Ar定年技术在定年精度、定年空间分辨率以及对极年轻样品定年实现突破的重要支撑。

     

    Abstract: Rare gas mass spectrometry is a basic prerequisite for obtaining high-precision 40Ar-39Ar dating data. This paper reviewed the development of noble gas mass spectrometry technique at home and abroad. On this basis, the problems and bottlenecks encountered in the application of noble gas mass spectrometry in 40Ar-39Ar dating were discussed. The development of multi-collector rare gas mass spectrometer with higher sensitivity and higher resolution is still an important means to promote the progress of 40Ar-39Ar dating technique in the future. Meanwhile, it is essential to establish the gas extraction techniques by laser melting, coupled with the very compact gas purification system with extremely low background, for taking advantage of the noble gas mass spectrometer in 40Ar-39Ar dating. These aspects are all important for the breakthrough of 40Ar-39Ar dating technique in the field of dating for extremely young samples.

     

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