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Thermal equation of state of F-bearing superhydrous phase B (Mg10Si3O14(OH,F)4): Implications for the transportation of fluorine and water into Earth’s lower mantle
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  • xiang Li,
  • Yungui Liu,
  • Ran Wang,
  • Takashi Yoshino,
  • Jingui Xu,
  • Dongzhou Zhang,
  • Tobias Grützner,
  • Junfeng Zhang,
  • Xiang Wu
xiang Li
China University of Geosciences
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Yungui Liu
China University of Geosciences
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Ran Wang
Okayama University
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Takashi Yoshino
Institute for Planetary Materials
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Jingui Xu
Hawai'i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawai'i at Manoa
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Dongzhou Zhang
University of Hawaii at Manoa
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Tobias Grützner
Sorbonne Université
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Junfeng Zhang
China University of Geosciences (Wuhan)
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Xiang Wu
China University of Geosciences

Corresponding Author:[email protected]

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To explore the influence of fluorine (F) on mantle minerals and its behaviors during subducting, we investigated the compressibility of F-bearing superhydrous phase B (Shy-B) using synchrotron-based single-crystal X-ray diffraction combined with diamond anvil cells up to 27 GPa and 750 K. Our results show that the presence of F can largely enhance the incompressibility of Shy-B. Based on the obtained thermal elastic parameters, density and velocity profiles are evaluated along cold and warm slabs. Our results demonstrate that addition of F enhances the density (~1.3-1.7%) and the bulk velocity (~1.0-2.4%) of Shy-B relative to OH end-member at uppermost lower mantle conditions. The decomposition of F-bearing Shy-B would lead to an abrupt increase in density (~8.9-10.5%) and a small increase in bulk velocity (~0.7-1.8%). The combined results could provide constraints for modeling the geodynamic process related to subduction and transportation of F and OH into lower mantle.
Feb 2022Published in Physics of the Earth and Planetary Interiors volume 323 on pages 106824. 10.1016/j.pepi.2021.106824