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Weak magnetism of Martian impact basins may reflect cooling in a reversing dynamo

Author

Listed:
  • S. C. Steele

    (Harvard University)

  • R. R. Fu

    (Harvard University)

  • A. Mittelholz

    (Harvard University
    ETH Zurich)

  • A. I. Ermakov

    (Stanford University)

  • R. I. Citron

    (MIT/NASA Goddard)

  • R. J. Lillis

    (Berkeley)

Abstract

Understanding the longevity of Mars’s dynamo is key to interpreting the planet’s atmospheric loss history and the properties of its deep interior. Satellite data showing magnetic lows above many large impact basins formed 4.1-3.7 billion years ago (Ga) have been interpreted as evidence that Mars’s dynamo terminated before 4.1 Ga—at least 0.4 Gy before intense late Noachian/early Hesperian hydrological activity. However, evidence for a longer-lived, reversing dynamo from young volcanics and the Martian meteorite ALH 84001 supports an alternative interpretation of Mars’s apparently demagnetized basins. To understand how a reversing dynamo would affect basin fields, here we model the cooling and magnetization of 200-2200 km diameter impact basins under a range of Earth-like reversal frequencies. We find that magnetic reversals efficiently reduce field strengths above large basins. In particular, if the magnetic properties of the Martian mantle are similar to most Martian meteorites and late remagnetization of the near surface is widespread, >90% of large ( > 800 km diameter) basins would appear demagnetized at spacecraft altitudes. This ultimately implies that Mars’s apparently demagnetized basins do not require an early dynamo cessation. A long-lived and reversing dynamo, unlike alternative scenarios, satisfies all available constraints on Mars’s magnetic history.

Suggested Citation

  • S. C. Steele & R. R. Fu & A. Mittelholz & A. I. Ermakov & R. I. Citron & R. J. Lillis, 2024. "Weak magnetism of Martian impact basins may reflect cooling in a reversing dynamo," Nature Communications, Nature, vol. 15(1), pages 1-16, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-51092-4
    DOI: 10.1038/s41467-024-51092-4
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    1. Henri Samuel & Mélanie Drilleau & Attilio Rivoldini & Zongbo Xu & Quancheng Huang & Raphaël F. Garcia & Vedran Lekić & Jessica C. E. Irving & James Badro & Philippe H. Lognonné & James A. D. Connolly , 2023. "Geophysical evidence for an enriched molten silicate layer above Mars’s core," Nature, Nature, vol. 622(7984), pages 712-717, October.
    2. Bruce M. Jakosky & Roger J. Phillips, 2001. "Mars' volatile and climate history," Nature, Nature, vol. 412(6843), pages 237-244, July.
    3. Sébastien Le Maistre & Attilio Rivoldini & Alfonso Caldiero & Marie Yseboodt & Rose-Marie Baland & Mikael Beuthe & Tim Van Hoolst & Véronique Dehant & William M. Folkner & Dustin Buccino & Daniel Kaha, 2023. "Spin state and deep interior structure of Mars from InSight radio tracking," Nature, Nature, vol. 619(7971), pages 733-737, July.
    4. A. Khan & D. Huang & C. Durán & P. A. Sossi & D. Giardini & M. Murakami, 2023. "Evidence for a liquid silicate layer atop the Martian core," Nature, Nature, vol. 622(7984), pages 718-723, October.
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