High-precision in situ analysis of Pb isotopes in melt inclusions by LA-ICP-MS and application of Independent Component Analysis

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  • Hamada Morihisa
    Department of Solid Earth Geochemistry, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Kimura Jun-Ichi
    Department of Solid Earth Geochemistry, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Chang Qing
    Department of Solid Earth Geochemistry, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Hanyu Takeshi
    Department of Solid Earth Geochemistry, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Ushikubo Takayuki
    Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Shimizu Kenji
    Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Ito Motoo
    Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Ozawa Takahiro
    Department of Earth and Planetary Sciences, Tokyo Institute of Technology
  • Iwamori Hikaru
    Department of Solid Earth Geochemistry, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Department of Earth and Planetary Sciences, Tokyo Institute of Technology

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  • High-precision <i>in situ</i> analysis of Pb isotopes in melt inclusions by LA-ICP-MS and application of Independent Component Analysis

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<p>We report a high-precision 206Pb-based lead isotope composition of olivine-hosted melt inclusions in basaltic rocks from Rarotonga Island, Polynesia, in the southern Pacific, using femtosecond laser ablation (FsLA)-multiple Faraday collector-inductively coupled plasma-mass spectrometry (MFC-ICP-MS). This improved method enables high-precision analysis of Pb isotopes from low-Pb (≤10 ppm) melt inclusions with a crater size of ~30 μm in diameter and depth. The small crater size allows for further analysis of major and trace elements from the same melt inclusions using FsLA-sector field (SF)-ICP-MS. Using Pb isotope ratios of two olivine-hosted melt inclusions, we suggest that the mantle source beneath Rarotonga Island is heterogeneous. Such identification becomes possible owing to high-precision in situ analysis of Pb isotopes in melt inclusions and application of statistical approaches such as Independent Component Analysis to the analytical data.</p>

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