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

  • Petrology and Geochemistry
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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.

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Acknowledgments

Xiang Wu acknowledges the financial support from the National Science Foundation of China (No. 41827802). We would like to thank Sergey Tkachev for gas loading the diamond anvil cells and Xi Zhu for help in data analysis. This work was performed at GeoSoilEnviroCARS, Advanced Photon Source (APS), Argonne National Laboratory (ANL). GeoSoilEnviroCARS operations were supported by the National Science Foundation-Earth Sciences (No. EAR-1634415) and the Department of Energy, Geosciences (No. DE-FG02-94ER14466). APS was supported by DOE-BES (No. DE-AC02-06CH11357). PX2 and the GSECARS/COMPRES gas loading system are supported in part by COMPRES under NSF Cooperative Agreement EAR-1661511. The final publication is available at Springer via https://doi.org/10.1007/s12583-021-1418-y.

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Correspondence to Xiang Wu.

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Liu, Y., Li, X., Song, H. et al. Thermal Equation of State of Natural F-Rich Topaz up to 29 GPa and 750 K. J. Earth Sci. 34, 758–766 (2023). https://doi.org/10.1007/s12583-021-1418-y

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  • DOI: https://doi.org/10.1007/s12583-021-1418-y

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