The trace-element compositions of mantle-derived basalts suggest that the asthenosphere has two distinct melt layers, with unique chemical compositions and physical properties.
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Chin, E.J. Dual mantle melt layers. Nat. Geosci. 17, 372–373 (2024). https://doi.org/10.1038/s41561-024-01439-9
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DOI: https://doi.org/10.1038/s41561-024-01439-9