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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    10 Citations (Scopus)


    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
    Issue number10
    Publication statusPublished - Oct 2012


    • In situ X-ray diffraction
    • Thermal equation of state
    • Thermoelastic properties

    ASJC Scopus subject areas

    • Geophysics
    • Geochemistry and Petrology


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