Matter and Radiation at Extremes, Volume. 7, Issue 6, 068101(2022)

Dense hydrous silica carrying water to the deep Earth and promotion of oxygen fugacity heterogeneity

Yanhao Lina) and Ho-Kwang Mao
Author Affiliations
  • Center for High Pressure Science and Technology Advanced Research, Beijing 100193, People’s Republic of China
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    Subduction of oceanic lithosphere drives material circulation in the Earth’s mantle, providingan important conduit for the deep-water cycle and the coevolution of the hydrosphere and solid Earth. Dehydration of water-bearing stishovite, CaCl2-type silica, and seifertite (DHS) during subduction results in the addition of water to mantle rocks, and this can significantly affect mineral phase relations, melting temperatures, and seismic velocities. Importantly, hydrous CaCl2-type silica can continuously carry water into the base of the mantle at mantle temperatures over 3000 K.6 The O2-dominated volatiles decomposed from the released water or newly formed high-pressure peroxides can oxygenate the surrounding mantle and promote melting.7–9
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    Yanhao Lin, Ho-Kwang Mao. Dense hydrous silica carrying water to the deep Earth and promotion of oxygen fugacity heterogeneity[J]. Matter and Radiation at Extremes, 2022, 7(6): 068101

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    Paper Information

    Category: Perspectives

    Received: Sep. 13, 2022

    Accepted: Sep. 22, 2022

    Published Online: Dec. 15, 2022

    The Author Email: Lin Yanhao (yanhao.lin@hpstar.ac.cn)

    DOI:10.1063/5.0125744

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