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Invisible water in subducted crust: Lawsonite velocity anomalies under mantle conditions

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Proceedings of the National Academy of Sciences, Volume 122, Issue 49, December 2025. <br/>SignificanceSeismic studies have long used velocity anomalies to identify water-rich subducted slabs entering Earth’s mantle. However, our direct measurements demonstrate that lawsonite—a key mineral carrying water in subducted crust—exhibits unexpected …

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