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Toward a mineral physics reference model for the Moon's core.

Daniele Antonangeli1, Guillaume Morard2, Nicholas C Schmerr3

  • 1Institut de Minéralogie, de Physique des Matériaux, et de Cosmochimie, UMR CNRS 7590, Sorbonne Universités - UPMC, Muséum National d'Histoire Naturelle, IRD Unité 206, 75252 Paris, France; daniele.antonangeli@impmc.upmc.fr.

Proceedings of the National Academy of Sciences of the United States of America
|March 17, 2015
PubMed
Summary
This summary is machine-generated.

This study measured the physical properties of face-centered cubic iron (γ-Fe) at high pressures and temperatures. Findings challenge existing seismic models for the Moon's core, proposing a new compositional and velocity model.

Keywords:
Moonhigh pressurehigh temperatureirontelluric planetary cores

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Area of Science:

  • Planetary Science
  • Geophysics
  • Materials Science

Background:

  • Planetary interiors feature iron-rich cores, influencing their evolution and dynamics.
  • Earth's core studies often focus on hexagonal closed packed iron (ε-Fe), but smaller planets' cores may contain face-centered cubic iron (γ-Fe).

Purpose of the Study:

  • To measure compressional and shear wave sound velocities and density of γ-Fe at high pressures and temperatures.
  • To provide data for accurate seismic models of smaller planetary bodies' interiors.
  • To propose a compositional and velocity model for the Moon's core.

Main Methods:

  • High-pressure and high-temperature experiments on γ-Fe.
  • Measurements of compressional and shear wave sound velocities.
  • Density measurements.

Main Results:

  • Seismic velocities of γ-Fe were determined at relevant planetary core conditions.
  • The measured seismic velocities are lower than those previously proposed for the Moon's inner core.
  • The data provide strong constraints for seismic models of small planetary cores.

Conclusions:

  • The physical properties of γ-Fe are essential for understanding the interiors of smaller terrestrial planets.
  • Existing seismic models for the Moon's core require revision based on these new γ-Fe data.
  • A direct compositional and velocity model for the Moon's core is proposed.