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Phase Stability of Al‐bearing Dense Hydrous Magnesium Silicates at Topmost Lower Mantle Conditions Implication for Water Transport in the Mantle

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Li,  Xinyang
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/speziale

Speziale,  S.
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Koch-Müller,  M.
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Husband,  Rachel Jane
External Organizations;

Liermann,  Hanns‐Peter
External Organizations;

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5013058.pdf
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Zitation

Li, X., Speziale, S., Koch-Müller, M., Husband, R. J., Liermann, H. (2022): Phase Stability of Al‐bearing Dense Hydrous Magnesium Silicates at Topmost Lower Mantle Conditions Implication for Water Transport in the Mantle. - Geophysical Research Letters, 49, 16, e2022GL098353.
https://doi.org/10.1029/2022GL098353


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5013058
Zusammenfassung
In this study, we investigated the phase stability of Al-free and Al-bearing superhydrous phase B (shy-B) up to 55 GPa and 2500 K. In comparison with Al-free shy-B, the incorporation of 11.7 wt.% Al2O3 in shy-B expands the stability by ∼400-800 K at 20-30 GPa. The determined dehydration boundary for Al-bearing phase D indicates that it could be present even at normal mantle geotherm conditions at 30-40 GPa. Up to 23.8 mol.% Al2O3 can be dissolved into the structures of akimotoite and bridgmanite as a result of the decomposition reactions of Al-bearing shy-B and phase D between 20-40 GPa. Results of further experiments indicate that δ-AlOOH is the stable hydrous phase coexisting with Al-depleted bridgmanite at pressures above 52 GPa. This study shows that the incorporation of Al in dense hydrous magnesium silicates can have a profound impact on our picture of the water cycle in the deep Earth.