C02 Laser-BrF5 Fluorination Technique for Analysis of Oxygen Three Isotopes of Rocks and Minerals

  • KUSAKABE Minoru
    Institute for Study of the Earth's Interior, Okayama University
  • MARUYAMA Seiji
    Institute for Study of the Earth's Interior, Okayama University
  • NAKAMURA Tomoki
    Department of Earth and Planetary Sciences, Graduate School of Science
  • YADA Toru
    Department of Earth and Planetary Sciences, Graduate School of Science

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  • CO2 Laser-BrF5 Fluorination Technique for Analysis of Oxygen Three Isotopes of Rocks and Minerals
  • CO2 laser fluorination technique for analysis of oxygen three isotopes of rocks and minerals

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Abstract

Technical details of an on-line CO2 laser-BrF5 fluorination system, installed at Institute for Study of the Earth's Interior, Okayama University, were described. The system allows us precise determination of oxygen three isotope composition (δ17O and δ18O) of rocks and minerals. The δ17O and δ18O values of some international and laboratory reference materials such as UWG2 garnet, NBS-28 quartz, NBS-30 biotite, San Carlos olivine, forsterite, fayalite, enstatite, augite, magnetite, zircon, and basalt glass from Juan de Fuca Ridge were determined with the precision of less than 0.1‰. The data plot well on the terrestrial fractionation line defined as δ17O=0.52×δ18O. The analytical system can be used for analysis of meteoritic materials. The results for international reference materials show generally good agreement with literature values. There exists, however, a small interlaboratory difference in δ18O values of reference materials that reflects how standardization was made at each laboratory. A common standardization, such as comparison of reference materials with O2 directly converted from VSMOW, is required to obtain better agreement within the international community.

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