In situ analyses of hydrogen and sulfur isotope ratios in basaltic glass using SIMS

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  • Shimizu Kenji
    Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology
  • Ushikubo Takayuki
    Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology
  • Murai Tomokazu
    Department of Earth and Planetary Science, Tokyo Institute of Technology
  • Matsu’ura Fumihiro
    Earth-Life Science Institute, Tokyo Institute of Technology
  • Ueno Yuichiro
    Department of Earth and Planetary Science, Tokyo Institute of Technology Earth-Life Science Institute, Tokyo Institute of Technology

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

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<p>We developed in situ 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 in situ 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 (34S/32S) ratios, 16OH (32S) and 16OD (34S) 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 34S/32S ratios were ~6‰ (H2O > 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>

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