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Earth shaped by primordial H2 atmospheres

Author

Listed:
  • Edward D. Young

    (University of California Los Angeles)

  • Anat Shahar

    (Earth and Planets Laboratory)

  • Hilke E. Schlichting

    (University of California Los Angeles)

Abstract

Earth’s water, intrinsic oxidation state and metal core density are fundamental chemical features of our planet. Studies of exoplanets provide a useful context for elucidating the source of these chemical traits. Planet formation and evolution models demonstrate that rocky exoplanets commonly formed with hydrogen-rich envelopes that were lost over time1. These findings suggest that Earth may also have formed from bodies with hydrogen-rich primary atmospheres. Here we use a self-consistent thermodynamic model to show that Earth’s water, core density and overall oxidation state can all be sourced to equilibrium between hydrogen-rich primary atmospheres and underlying magma oceans in its progenitor planetary embryos. Water is produced from dry starting materials resembling enstatite chondrites as oxygen from magma oceans reacts with hydrogen. Hydrogen derived from the atmosphere enters the magma ocean and eventually the metal core at equilibrium, causing metal density deficits matching that of Earth. Oxidation of the silicate rocks from solar-like to Earth-like oxygen fugacities also ensues as silicon, along with hydrogen and oxygen, alloys with iron in the cores. Reaction with hydrogen atmospheres and metal–silicate equilibrium thus provides a simple explanation for fundamental features of Earth’s geochemistry that is consistent with rocky planet formation across the Galaxy.

Suggested Citation

  • Edward D. Young & Anat Shahar & Hilke E. Schlichting, 2023. "Earth shaped by primordial H2 atmospheres," Nature, Nature, vol. 616(7956), pages 306-311, April.
  • Handle: RePEc:nat:nature:v:616:y:2023:i:7956:d:10.1038_s41586-023-05823-0
    DOI: 10.1038/s41586-023-05823-0
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    Cited by:

    1. Joshua Krissansen-Totton & Nicholas Wogan & Maggie Thompson & Jonathan J. Fortney, 2024. "The erosion of large primary atmospheres typically leaves behind substantial secondary atmospheres on temperate rocky planets," Nature Communications, Nature, vol. 15(1), pages 1-16, December.
    2. Wenzhong Wang & Michael J. Walter & John P. Brodholt & Shichun Huang, 2024. "Early planetesimal differentiation and late accretion shaped Earth’s nitrogen budget," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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