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Pressure stabilizes ferrous iron in bridgmanite under hydrous deep lower mantle conditions

Author

Listed:
  • Li Zhang

    (Center for High Pressure Science and Technology Advanced Research)

  • Yongjin Chen

    (Center for High Pressure Science and Technology Advanced Research)

  • Ziqiang Yang

    (Center for High Pressure Science and Technology Advanced Research)

  • Lu Liu

    (Center for High Pressure Science and Technology Advanced Research)

  • Yanping Yang

    (Center for High Pressure Science and Technology Advanced Research)

  • Philip Dalladay-Simpson

    (Center for High Pressure Science and Technology Advanced Research)

  • Junyue Wang

    (Center for High Pressure Science and Technology Advanced Research)

  • Ho-kwang Mao

    (Institute for Shanghai Advanced Research in Physical Sciences)

Abstract

Earth’s lower mantle is a potential water reservoir. The physical and chemical properties of the region are in part controlled by the Fe3+/ΣFe ratio and total iron content in bridgmanite. However, the water effect on the chemistry of bridgmanite remains unclear. We carry out laser-heated diamond anvil cell experiments under hydrous conditions and observe dominant Fe2+ in bridgmanite (Mg, Fe)SiO3 above 105 GPa under the normal geotherm conditions corresponding to depth > 2300 km, whereas Fe3+-rich bridgmanite is obtained at lower pressures. We further observe FeO in coexistence with hydrous NiAs-type SiO2 under similar conditions, indicating that the stability of ferrous iron is a combined result of H2O effect and high pressure. The stability of ferrous iron in bridgmanite under hydrous conditions would provide an explanation for the nature of the low-shear-velocity anomalies in the deep lower mantle. In addition, entrainment from a hydrous dense layer may influence mantle plume dynamics and contribute to variations in the redox conditions of the mantle.

Suggested Citation

  • Li Zhang & Yongjin Chen & Ziqiang Yang & Lu Liu & Yanping Yang & Philip Dalladay-Simpson & Junyue Wang & Ho-kwang Mao, 2024. "Pressure stabilizes ferrous iron in bridgmanite under hydrous deep lower mantle conditions," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-48665-8
    DOI: 10.1038/s41467-024-48665-8
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    References listed on IDEAS

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