ArticleScience advances2026
Hydrogen isotopes reveal water leakage from the core.
Article in Science advances, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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4 authors.
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Abstract
Chemical heterogeneities in Earth's deep mantle may record either preserved primordial reservoirs or later core-mantle exchange, but distinguishing between these origins remains challenging. Hydrogen isotopes offer a sensitive tracer, yet whether magma ocean crystallization could generate a deuterium-depleted deep reservoir has not been quantitatively evaluated. Here, we use machine learning-accelerated path-integral simulations to determine equilibrium hydrogen isotope fractionation between silicate melt and bridgmanite, ringwoodite, and wadsleyite under magma ocean conditions. Incorporating these fractionation factors into a magma ocean crystallization model shows that mineral-melt fractionation is intrinsically weak, producing an essentially homogeneous D/H distribution in the primitive mantle. Magma ocean crystallization therefore cannot generate the extremely low δD values observed in some ocean island basalts. Combined with exceptionally high
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