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Chalcogen isotopes reveal limited volatile contribution from late veneer to Earth

Science advances, 2023-12, Vol.9 (49), p.eadh0670-eadh0670 [Peer Reviewed Journal]

info:eu-repo/semantics/openAccess ;ISSN: 2375-2548 ;EISSN: 2375-2548 ;DOI: 10.1126/sciadv.adh0670 ;PMID: 38055829

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  • Title:
    Chalcogen isotopes reveal limited volatile contribution from late veneer to Earth
  • Author: Wang, Wenzhong ; Walter, Michael J ; Brodholt, John P ; Huang, Shichun ; Petaev, Michail I
  • Is Part Of: Science advances, 2023-12, Vol.9 (49), p.eadh0670-eadh0670
  • Description: The origin of Earth's volatile elements is highly debated. Comparing the chalcogen isotope ratios in the bulk silicate Earth (BSE) to those of its possible building blocks, chondritic meteorites, allows constraints on the origin of Earth's volatiles; however, these comparisons are complicated by potential isotopic fractionation during protoplanetary differentiation, which largely remains poorly understood. Using first-principles calculations, we find that core-mantle differentiation does not notably fractionate selenium and tellurium isotopes, while equilibrium evaporation from early planetesimals would enrich selenium and tellurium in heavy isotopes in the BSE. The sulfur, selenium, and tellurium isotopic signatures of the BSE reveal that protoplanetary differentiation plays a key role in establishing most of Earth's volatile elements, and a late veneer does not substantially contribute to the BSE's volatile inventory.
  • Publisher: United States: American Association for the Advancement of Science
  • Language: English;Norwegian
  • Identifier: ISSN: 2375-2548
    EISSN: 2375-2548
    DOI: 10.1126/sciadv.adh0670
    PMID: 38055829
  • Source: Journals@Ovid Open Access Journal Collection Rolling
    NORA Norwegian Open Research Archives
    PubMed Central
    Directory of Open Access Journals
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