P-V-T relations of MgSiO3 perovskite determined by in situ X-ray diffraction using a large-volume high-pressure apparatus

Tomoo Katsura, Sho Yokoshi, Kazuaki Kawabe, Anton Shatskiy, M. A.G.M. Manthilake, Shuangmeng Zhai, Hiroshi Fukui, H. A.Chamathni Hegoda, Takashi Yoshino, Daisuke Yamazaki, Takuya Matsuzaki, Akira Yoneda, Eiji Ito, Mitsuhiro Sugita, Naotaka Tomioka, Kenji Hagiya, Akifumi Nozawa, Ken Ichi Funakoshi

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Abstract

The volume of MgSiO3 perovskite has been precisely measured at pressures of 19 to 53 GPa and temperatures of 300 to 2300 K by means of in situ X-ray diffraction in a multi-anvil apparatus. The present results indicate the isothermal bulk modulus KT0 = 256(2) GPa and its pressure derivative K′T0 = 3.8(2). The fixed Debye temperature θ0 = 1030 K gives a Grüneisen parameter at ambient pressure γo = 2.6(1) and its logarithmic volume dependence q = 1.7(1). The pressure derivative of the isothermal bulk modulus, Anderson-Grüneisen parameter and thermal expansion coefficient at ambient pressure are found to be (∂KT/∂T)P = -0.035(2) GPa/K, δT = 6.5(5), α0 = 2.6(1) × 10-5 + 1.0(1) × 10-8(T-300)/K. Thus the thermal expansion coefficient largely becomes smaller with increasing pressure. The adiabatic geotherm would be fairly large, such as 0.41 K/km at a 660 km depth, and becoming smaller with increasing depth. The temperature and adiabatic geothermal gradient at the bottom of the D′ layer would be 2400 K and 0.14 K/km. The buoyancydriven mantle convection could be very small in the lower part of the lower mantle.

Original languageEnglish
Article numberL01305
JournalGeophysical Research Letters
Volume36
Issue number1
DOIs
Publication statusPublished - 2009 Jan 16

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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    Katsura, T., Yokoshi, S., Kawabe, K., Shatskiy, A., Manthilake, M. A. G. M., Zhai, S., Fukui, H., Hegoda, H. A. C., Yoshino, T., Yamazaki, D., Matsuzaki, T., Yoneda, A., Ito, E., Sugita, M., Tomioka, N., Hagiya, K., Nozawa, A., & Funakoshi, K. I. (2009). P-V-T relations of MgSiO3 perovskite determined by in situ X-ray diffraction using a large-volume high-pressure apparatus. Geophysical Research Letters, 36(1), [L01305]. https://doi.org/10.1029/2008GL035658