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

• 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

Bibliographic Information

Other Title

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

Abstract

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.

Journal

• GEOCHEMICAL JOURNAL

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

  GEOCHEMICAL SOCIETY OF JAPAN

Keywords

• Rarotonga Island
• ocean island basalt
• Pb isotope
• laser ablation ICP-MS
• Independent Component Analysis

Details

• CRID: 1390001204552483456
• NII Article ID: 130006333264
• NII Book ID: AA00654975
• DOI: 10.2343/geochemj.2.0497
• ISSN: 18805973
• ISSN: 00167002
• NDL BIB ID: 028897779
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I028897779
• Web Site: https://www.jstage.jst.go.jp/article/geochemj/52/1/52_2.0497/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed