High-pressure experiments reveal that calcium solubility in bridgmanite is insufficient to fully remove davemaoite from the Earth’s lower mantle. We propose that davemaoite-enriched domains form at the core–mantle boundary, serving as reservoirs for incompatible elements and offering a potential explanation for large low shear-wave velocity provinces.
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References
Irifune, T. Absence of an aluminous phase in the upper part of the Earth's lower mantle. Nature 370, 131–133 (1994). This paper reports on high-pressure experiments that suggest that davemaoite should exist in the lower mantle.
Ko, B. et al. Calcium dissolution in bridgmanite in the Earth’s deep mantle. Nature 611, 88–92 (2022). This paper reports that davemaoite can fully dissolve into bridgmanite at high temperature regions in the lower mantle.
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This is a summary of: Wang, L. et al. Persistence of davemaoite at lower-mantle conditions. Nat. Geosci. https://doi.org/10.1038/s41561-025-01657-9 (2025).
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Davemaoite is present throughout the Earth’s lower mantle. Nat. Geosci. 18, 283–284 (2025). https://doi.org/10.1038/s41561-025-01658-8
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DOI: https://doi.org/10.1038/s41561-025-01658-8
