What does this research mean for the field?

In the deep lower mantle, the stability of water storage phases such as NiAs-type silica depends on high alumina content coupled with H2O, which significantly alters mantle mineralogy and potentially mantle dynamics. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

Investigate water storage capacity, phase transitions, and mineral stability in hydrous basaltic systems representing subducted oceanic crust under deep lower mantle conditions.

August 29, 2026Journal of Geophysical Research Solid EarthOpen Access

Stability of Water‐Bearing Aluminous Silica Phases in Subducted Oceanic Crust: Implications for Water Transport to the Core‐Mantle Boundary

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Authors

YYYao Yao LLLu Liu ZYZiqiang Yang

Discussion

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Overview

Experimental study reveals stable hydrous aluminous silica and iron oxyhydroxide in subducted oceanic crust, indicating water transport mechanisms extending to the core-mantle boundary.

Key Points

Investigate water storage capacity, phase transitions, and mineral stability in hydrous basaltic systems representing subducted oceanic crust under deep lower mantle conditions.
Conducted high-pressure and high-temperature experiments in the MgO-Al2O3-Fe2O3-SiO2-H2O system across pressures of 94–134 GPa and temperatures of 2,100–2,500 K.
Evaluated phase boundaries by comparing water-bearing basaltic compositions containing high alumina against alumina-poor hydrous silica systems under matching conditions.
Stabilized NiAs-type silica in water-bearing basaltic compositions along normal lower-mantle geotherms, confirming that high alumina content coupled with water is required to maintain this structure.
Observed CaCl2-type silica instead in alumina-poor hydrous systems under the same pressure-temperature conditions, delineating a distinct phase boundary between the two structural types.
Documented the stable coexistence of aluminous silica and pyrite-type FeOOH under extreme conditions corresponding to mantle depths greater than 2,300 km.

Cite This Study

Yao et al. (2026) studied this question.

synapsesocial.com/papers/6a92be7b8e5d7d1fc0c12303 https://doi.org/10.1029/2026jb034479

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August 29, 2026Journal of Geophysical Research Solid EarthOpen Access

Stability of Water‐Bearing Aluminous Silica Phases in Subducted Oceanic Crust: Implications for Water Transport to the Core‐Mantle Boundary

View Full Paper

Ask AI

Bookmark

Authors

YYYao Yao LLLu Liu ZYZiqiang Yang

Discussion

Member takes

Overview

Experimental study reveals stable hydrous aluminous silica and iron oxyhydroxide in subducted oceanic crust, indicating water transport mechanisms extending to the core-mantle boundary.

Key Points

Investigate water storage capacity, phase transitions, and mineral stability in hydrous basaltic systems representing subducted oceanic crust under deep lower mantle conditions.
Conducted high-pressure and high-temperature experiments in the MgO-Al2O3-Fe2O3-SiO2-H2O system across pressures of 94–134 GPa and temperatures of 2,100–2,500 K.
Evaluated phase boundaries by comparing water-bearing basaltic compositions containing high alumina against alumina-poor hydrous silica systems under matching conditions.
Stabilized NiAs-type silica in water-bearing basaltic compositions along normal lower-mantle geotherms, confirming that high alumina content coupled with water is required to maintain this structure.
Observed CaCl2-type silica instead in alumina-poor hydrous systems under the same pressure-temperature conditions, delineating a distinct phase boundary between the two structural types.
Documented the stable coexistence of aluminous silica and pyrite-type FeOOH under extreme conditions corresponding to mantle depths greater than 2,300 km.

Cite This Study

Yao et al. (2026) studied this question.

synapsesocial.com/papers/6a92be7b8e5d7d1fc0c12303 https://doi.org/10.1029/2026jb034479

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