{
  "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 3 He/ 4 He ratios, these signatures more plausibly reflect selective transfer of primordial volatiles from Earth’s core, implying sustained volatile exchange across the core-mantle boundary.",
  "abstract_shown": true,
  "affiliations": [
    "State Key Laboratory of Precision Geodesy, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China.",
    "National Geophysical Observatory at Mengcheng, University of Science and Technology of China, Hefei, China."
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 4,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Yu Zhang",
      "orcid": "0009-0000-6584-9724"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Wenzhong Wang",
      "orcid": "0000-0002-8824-7475"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Zhongqing Wu",
      "orcid": "0000-0002-4842-6380"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Bowen Chen",
      "orcid": "0000-0002-7240-0295"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/49bh00k6hxxzv.bib",
  "cited_by": 0,
  "doi": "10.1126/sciadv.aei4756",
  "fulltext_url": null,
  "id": "49bh00k6hxxzv",
  "issns": [
    "2375-2548"
  ],
  "landing_url": "https://www.science.org/doi/10.1126/sciadv.aei4756",
  "language": null,
  "licence": "CC-BY-NC",
  "licence_label": "CC BY-NC",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by-nc/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "1908|Geological and Geochemical Analysis"
    ]
  ],
  "openalex": "W7221184181",
  "pdf_url": null,
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-09",
  "publisher": "American Association for the Advancement of Science (AAAS)",
  "ris": "https://research.draconitic.com/paper/49bh00k6hxxzv.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:41Z",
      "native_id": "10.1126/sciadv.aei4756",
      "source": "crossref",
      "url": "https://www.science.org/doi/10.1126/sciadv.aei4756"
    }
  ],
  "subjects": [
    {
      "field": "earth",
      "origin": "openalex:1908|Geological and Geochemical Analysis",
      "subfield": "geophysics"
    }
  ],
  "title": "Hydrogen isotopes reveal water leakage from the core",
  "title_text": "Hydrogen isotopes reveal water leakage from the core",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:41Z",
  "url": "https://research.draconitic.com/paper/49bh00k6hxxzv",
  "venue": "Science Advances",
  "versions": []
}