Abstract
We have systematically investigated the high-pressure and high-temperature stability of Al-bearing dense hydrous magnesium silicate phases (DHMSs) in natural chlorite compositions containing ~ 16 wt% H2O and ~ 14 wt% Al2O3 between 14 and 25 GPa at 800–1600 °C by an MA8-type multi-anvil apparatus. A chemical mixture similar to Fe-free chlorite was also investigated for comparison. Following the pressure–temperature (P–T) path of cold subduction, the phase assemblage of phase E + phase D is stable at 14–25 GPa. Superhydrous phase B is observed between 16 and 22 GPa coexisting with phase E + phase D. Following the P–T path of hot subduction, the phase assemblage of phase E + garnet is identified at 14–18 GPa coexisting with the melt. The phase assemblage of superhydrous phase B + phase D was found at 18–25 GPa, which is expected to survive at higher P–T conditions. We have confirmed that the presence of Al could enhance the stability of DHMSs. Our results indicate that, after chlorite decomposition at the shallow region of the subduction zone, the wide stability field of Al-bearing DHMSs can increase the possibility of water transportation into the deep lower mantle.
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Acknowledgements
This work was funded by the National Natural Science Foundation of China (42003050), the Open Foundation of the United Laboratory of High-Pressure Physics and Earthquake Science (2019HPPES07), the China Postdoctoral Science Foundation (2020M680619), Open Foundation of Key Laboratory of Earth and Planetary Physics, Chinese Academy of Sciences (No. DQXX2021-06) and the Foundation of the Key Laboratory of Earthquake Forecasting, the Institute of Earthquake Forecasting, CEA (2019IEF0502). C.X. was also supported by Research Fellowships of the Japan Society for the Promotion of Science (JSPS) for Young Scientists (DC2). This work was jointly supported by JSPS KAKENHI Grant numbers 18J12511 for C.X. and 26247073, 15H05828, and 18H03740 for T.I.
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Xu, C., Inoue, T., Kakizawa, S. et al. Effect of Al on the stability of dense hydrous magnesium silicate phases to the uppermost lower mantle: implications for water transportation into the deep mantle. Phys Chem Minerals 48, 31 (2021). https://doi.org/10.1007/s00269-021-01156-4
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DOI: https://doi.org/10.1007/s00269-021-01156-4