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

研究成果: Contribution to journalArticle査読

3 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)237-247
ページ数11
ジャーナルPhysics and Chemistry of Minerals
45
3
DOI
出版ステータス出版済み - 3 1 2018
外部発表はい

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 地球化学および岩石学

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