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

Li Zhang (), Yongjin Chen, Ziqiang Yang, Lu Liu, Yanping Yang, Philip Dalladay-Simpson, Junyue Wang and Ho-kwang Mao
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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

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-48665-8

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