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Constraining Earth's core composition from inner core nucleation.
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Abstract
The composition of Earth’s core is a fundamental property of the Earth’s deep interior, defining its present structure and long term thermal and magnetic evolution. However, the composition of the core is not well understood, with several combinations of light elements being able to satisfy the traditional constraints from cosmochemistry, core formation and seismology.
The traditional view of inner core formation does not include the necessity for liquids to be supercooled to below their melting point before freezing.
Attempts to calculate the magnitude of this supercooling have found that several simple core compositions are incompatible with inner core nucleation. Through molecular dynamics simulations, we show that nucleation from an Fe(1-x)C(x=0.1-0.15) composition is compatible with a range of geophysical constraints. Whilst not a complete description of core chemistry, our results demonstrate that inner core nucleation places strong constrain on the composition of Earth’s core that may allow discrimination between previously identified potential compositions.
DOI
https://doi.org/10.31223/X53D8H
Subjects
Earth Sciences, Geophysics and Seismology, Mineral Physics, Physical Sciences and Mathematics, Planetary Geophysics and Seismology, Planetary Mineral Physics, Planetary Sciences
Keywords
inner core, carbon, nucleation
Dates
Published: 2024-08-02 18:37
Last Updated: 2025-05-01 01:28
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License
CC BY Attribution 4.0 International
Additional Metadata
Conflict of interest statement:
None
Data Availability (Reason not available):
Data available at https://doi.org/10.5281/zenodo.13144422
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