Ar Isotope Analysis for K-Ar Dating Using Two Modified-VG5400 Mass Spectrometers-I: Isotope Dilution Method.

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  • NAGAO Keisuke
    Institute for Study of the Earth's Interior, Okayama University
  • OGATA Atsumi
    Institute for Study of the Earth's Interior, Okayama University
  • MIURA Yayoi N.
    Institute for Study of the Earth's Interior, Okayama University
  • YAMAGUCHI Kenji
    Institute for Study of the Earth's Interior, Okayama University

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  • Ar Isotope Analysis for K-Ar Dating Using Two Modified-VG5400 Mass Spectrometers-1-Isotope Dilution Method
  • Ar Isotope Analysis for K Ar Dating Usi
  • Ar isotope analysis for K–Ar dating using two modified-VG5400 mass spectropmeters-I: isotope dilution method
  • Ar isotope analysis for K–Ar dating using two modified-VG5400 mass spectrometers—I: isotope dilution method

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Abstract

Two noble gas mass spectrometry systems (MS-I and MS-II) have been installed in 1989, one of which was designed in our laboratory for Ar isotope analysis to measure K-Ar age by isotope dilution method using 38Ar-spike. The whole system was modified and improved to obtain high quality Ar data. The improved system composed of an Ar extraction and purification line and a Modified-VG5400 mass spectrometer enables us to determine precise Ar isotope composition easily and speedily irrespective to operator's skillfulness.<br>Formulas calculating radiogenic 40Ar abundance, which takes account of correction for Ar isotopes of both spike and blank, are presented. For samples with young K-Ar age, formulas to estimate the radiogenic 40Ar abundance based on 40Ar/36Ar ratio are also proposed. Replicate analyses on many K-Ar standard samples show that the system can be applicable to samples with ages ranging 0.01 to 1500 Ma without any systematic analytical errors.

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