P-V-T relations of γ-Ca3(PO4)2 tuite determined by in situ X-ray diffraction in a large-volume high-pressure apparatus

Shuangmeng Zhai, Daisuke Yamazaki, Weihong Xue, Lijin Ye, Chaowen Xu, Shuangming Shan, Eiji Ito, Akira Yoneda, Takashi Yoshino, Xinzhuan Guo, Akira Shimojuku, Noriyoshi Tsujino, Ken Ichi Funakoshi

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Abstract

Tuite, γ-Ca3(PO4)2, is regarded as an important phosphate mineral in the deep mantle playing a crucial role as a host for rare earth elements, large ion lithophile elements, and phosphorus. In this study we report the thermoelastic properties of synthetic γ-Ca 3(PO4)2 at simultaneously high pressures and temperatures of up to 35.4 GPa and 1300 K, respectively, as determined by means of in situ energy-dispersive X-ray diffraction in a large-volume multi-anvil apparatus. The pressure-volume-temperature data obtained for γ-Ca 3(PO4)2 were fitted by the high-temperature Birch-Murnaghan equation of state to yield V0 = 447.4(4) Å3, KT0 = 100.8(18) GPa, K′T0 = 5.74(13), (∂KT/∂T)P = -0.020(1) GPa/K, and αT = 3.26(18) × 10-5 + 1.76(24) × 10-8 T. In addition, fitting the present data to the Mie-Grüneisen-Debye equation of state gives γ0 = 1.35(6), θ0 = 944(136) K, and q = 0.37(29). Based on the thermoelastic properties obtained in our study, the density profiles of γ-Ca 3(PO4)2 tuite along typical cold and hot slab geotherms were calculated and are compared with those of the coexisting silicate minerals in subducting mid-ocean ridge basalt.

Original languageEnglish
Pages (from-to)1811-1816
Number of pages6
JournalAmerican Mineralogist
Volume98
Issue number10
DOIs
Publication statusPublished - Oct 1 2012

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Keywords

  • In situ X-ray diffraction
  • Thermal equation of state
  • Thermoelastic properties
  • γ-Ca(PO) tuite

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Cite this

Zhai, S., Yamazaki, D., Xue, W., Ye, L., Xu, C., Shan, S., Ito, E., Yoneda, A., Yoshino, T., Guo, X., Shimojuku, A., Tsujino, N., & Funakoshi, K. I. (2012). P-V-T relations of γ-Ca3(PO4)2 tuite determined by in situ X-ray diffraction in a large-volume high-pressure apparatus. American Mineralogist, 98(10), 1811-1816. https://doi.org/10.2138/am.2013.4403