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Widespread impact-generated porosity in early planetary crusts

Author

Listed:
  • Sean E. Wiggins

    (Purdue University)

  • Brandon C. Johnson

    (Purdue University
    Purdue University)

  • Gareth S. Collins

    (Imperial College London)

  • H. Jay Melosh

    (Purdue University
    Purdue University)

  • Simone Marchi

    (Southwest Research Institute)

Abstract

NASA’s Gravity Recovery and Interior Laboratory (GRAIL) spacecraft revealed the crust of the Moon is highly porous, with ~4% porosity at 20 km deep. The deep lying porosity discovered by GRAIL has been difficult to explain, with most current models only able to explain high porosity near the lunar surface (first few kilometers) or inside complex craters. Using hydrocode routines we simulated fracturing and generation of porosity by large impacts in lunar, martian, and Earth crust. Our simulations indicate impacts that produce 100–1000 km scale basins alone are capable of producing all observed porosity within the lunar crust. Simulations under the higher surface gravity of Mars and Earth suggest basin forming impacts can be a primary source of porosity and fracturing of ancient planetary crusts. Thus, we show that impacts could have supported widespread crustal fluid circulation, with important implications for subsurface habitable environments on early Earth and Mars.

Suggested Citation

  • Sean E. Wiggins & Brandon C. Johnson & Gareth S. Collins & H. Jay Melosh & Simone Marchi, 2022. "Widespread impact-generated porosity in early planetary crusts," Nature Communications, Nature, vol. 13(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32445-3
    DOI: 10.1038/s41467-022-32445-3
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