An early geodynamo driven by exsolution of mantle components from Earth’s core

James Badro (), Julien Siebert and Francis Nimmo
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James Badro: Institut de Physique du Globe de Paris, Université Sorbonne Paris Cité
Julien Siebert: Institut de Physique du Globe de Paris, Université Sorbonne Paris Cité
Francis Nimmo: University of California Santa Cruz

Nature, 2016, vol. 536, issue 7616, 326-328

Abstract: Experiments show that magnesium oxide can dissolve in core-forming metallic melts at very high temperatures; core formation models suggest that a giant impact during Earth’s accretion could have contributed large amounts of magnesium to the early core, the subsequent exsolution of which would have generated enough gravitational energy to power an early geodynamo and produce an ancient magnetic field.

Date: 2016
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DOI: 10.1038/nature18594

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