Determination of elastic constants of single-crystal chromian spinel by resonant ultrasound spectroscopy and implications for fluid inclusion geobarometry

Kenya Ono, Yuya Harada, Akira Yoneda, Junji Yamamoto, Akira Yoshiasa, Kazumasa Sugiyama, Hiroshi Arima, Tohru Watanabe

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)

    Abstract

    We determined elastic constants of a single-crystal chromian spinel at temperatures from −15 to 45 °C through the Rectangular Parallelepiped Resonance method. The sample is a natural chromian spinel, which was separated from a mantle xenolith. Elastic constants at an ambient temperature (T = 24.0 °C) are C11 = 264.8(1.7) GPa, C12 = 154.5(1.8) GPa and C44 = 142.6(0.3) GPa. All the elastic constants decrease linearly with increasing temperature. The temperature derivatives are dC11/dT = −0.049(2) GPa/°K, dC12/dT = −0.019(1) GPa/°K and dC44/dT = −0.020(1) GPa/°K. As an implication of the elastic constants, we applied them to the correction of a fluid inclusion geobarometry, which utilizes residual pressure of fluid inclusion as a depth scale. Before entrainment by a magma, the fluid inclusions must have the identical fluid density in constituent minerals of a xenolith. It has been, however, pointed out that fluid density of fluid inclusions significantly varies with host mineral species. The present study elucidates that elastic constants and thermal expansion coefficients cannot explain the difference in fluid density among mineral species. The density difference would reflect the difference in the degree of plastic deformation in the minerals.

    Original languageEnglish
    Pages (from-to)237-247
    Number of pages11
    JournalPhysics and Chemistry of Minerals
    Volume45
    Issue number3
    DOIs
    Publication statusPublished - Mar 1 2018

    Keywords

    • Chromian spinel
    • Elastic constants
    • Fluid inclusion
    • Geobarometry
    • Mantle xenolith
    • Resonance method

    ASJC Scopus subject areas

    • Materials Science(all)
    • Geochemistry and Petrology

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