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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Abstract

<p>We report a high-precision <sup>206</sup>Pb-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 <i>in situ</i> analysis of Pb isotopes in melt inclusions and application of statistical approaches such as Independent Component Analysis to the analytical data.</p>

Journal

  • GEOCHEMICAL JOURNAL

    GEOCHEMICAL JOURNAL 52(1), 69-74, 2018

    GEOCHEMICAL SOCIETY OF JAPAN

Codes

  • NII Article ID (NAID)
    130006333264
  • NII NACSIS-CAT ID (NCID)
    AA00654975
  • Text Lang
    ENG
  • ISSN
    0016-7002
  • NDL Article ID
    028897779
  • NDL Call No.
    Z53-R488
  • Data Source
    NDL  J-STAGE 
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