<i>In situ</i> analyses of hydrogen and sulfur isotope ratios in basaltic glass using SIMS

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Abstract

<p>We developed <i>in situ</i> analyses of hydrogen and sulfur isotope ratios of basaltic glass using high-resolution, multi-collection secondary ion mass spectrometry (CAMECA IMS-1280HR). Hydrogen and sulfur isotopes of standard basaltic glasses were determined by a high-temperature conversion elemental analyzer/isotope ratio mass spectrometer (IRMS) and IRMS, respectively. For the <i>in situ</i> analysis of sulfur isotopes, a defocused Cs beam (~0.5 nA; ~10 μm diameter) was used, but for hydrogen isotopes, we used a larger defocused beam (~5 nA; ~15 μm diameter) to decrease the hydrogen background. For analyses of D/H (<sup>34</sup>S/<sup>32</sup>S) ratios, <sup>16</sup>OH (<sup>32</sup>S) and <sup>16</sup>OD (<sup>34</sup>S) were measured in multi-detection mode with a Faraday cup and an axial electron multiplier, respectively. Each measurement time was 6–7 minutes. Precisions (2 standard errors) for D/H and <sup>34</sup>S/<sup>32</sup>S ratios were ~6‰ (H<sub>2</sub>O > 1 wt%) and ~0.6‰ (S > 1000 ppm), respectively. Our developed method for rapid and high spatial resolution analysis can determine multiple elements and isotopes of volatiles in a single small melt inclusion of ~30 μm diameter. Using this method, we analyzed hydrogen and sulfur isotope ratios of submarine basaltic glasses from mid-oceanic ridges and oceanic islands of Hawaii and confirmed that their D/H and S isotope ratios were consistent with reported values.</p>

Journal

  • GEOCHEMICAL JOURNAL

    GEOCHEMICAL JOURNAL 53(3), 195-207, 2019

    GEOCHEMICAL SOCIETY OF JAPAN

Codes

  • NII Article ID (NAID)
    130007662306
  • NII NACSIS-CAT ID (NCID)
    AA00654975
  • Text Lang
    ENG
  • ISSN
    0016-7002
  • NDL Article ID
    029871395
  • NDL Call No.
    Z53-R488
  • Data Source
    NDL  J-STAGE 
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