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Volume 34 Issue 3
Jun 2023
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Journal of Earth Science  > 2023  >  34(3): 758-766.
Yungui Liu, Xiang Li, Haipeng Song, Jingui Xu, Dongzhou Zhang, Junfeng Zhang, Xiang Wu. Thermal Equation of State of Natural F-Rich Topaz up to 29 GPa and 750 K. Journal of Earth Science, 2023, 34(3): 758-766. doi: 10.1007/s12583-021-1418-y
Citation: Yungui Liu, Xiang Li, Haipeng Song, Jingui Xu, Dongzhou Zhang, Junfeng Zhang, Xiang Wu. Thermal Equation of State of Natural F-Rich Topaz up to 29 GPa and 750 K. Journal of Earth Science, 2023, 34(3): 758-766. doi: 10.1007/s12583-021-1418-y
shu

Thermal Equation of State of Natural F-Rich Topaz up to 29 GPa and 750 K

doi: 10.1007/s12583-021-1418-y
  • 1.

    State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

  • 2.

    College of Gems and Materials, Hebei GEO University, Shijiazhuang 050031, China

  • 3.

    Hawai'i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu HI 96822, USA

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  • Corresponding author: Xiang Wu, wuxiang@cug.edu.cn
  • Received Date: 21 Dec 2020
  • Accepted Date: 20 Jan 2021
    • Available Online: 08 Jun 2023
  • Issue Publish Date: 30 Jun 2023
    Abstract

  • Subducting oceanic sediments and crusts, originating from the Earth's surface and descending into its deep interior, are important carriers of volatiles. The volatiles have significant effects on materials cycling and the dynamic evolution of the subduction zones. A simplified Al2O3-SiO2-H2O (ASH) ternary system models the relationship of minerals in the hydrated and alumina-silica rich sedimentary layer. Topaz Al2SiO4(F, OH)2 is an important mineral in the ASH system and comprises two volatiles: H2O and fluorine (F). In this study, the thermoelasticity of a natural F-rich topaz was investigated using synchrotron-based single-crystal X-ray diffraction combined with diamond anvil cells up to 29.1 GPa and 750 K. The pressure-volume-temperature data were fitted to a third-order Birch-Murnaghan Equation of state with V0 = 343.15(7) Å3, K0 = 166(1) GPa, K0' = 3.0(1), (∂K0/∂T)P = -0.015(9) GPa/K and α0 = 3.9(5) × 10-5 K-1. The isothermal bulk modulus increases with the F content in topaz, and the various F contents present significant effects on its anisotropic compressibility. Our results further reveal that the isothermal bulk modulus K0 of the minerals in ASH system increases with density. F and H contents in hydrous minerals might greatly affect their properties (e.g., compressibility and stability), providing more comprehensive constraints on the subduction zones.

     

    • Electronic Supplementary Materials: Supplementary materials (Figs. S1–S3; Tables S1–S3) are available in the online version of this article at https://doi.org/10.1007/s12583-021-1418-y.
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