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Area of Science:

  • Geophysics
  • Planetary Science
  • High-Pressure Mineral Physics

Background:

  • Liquid-liquid immiscibility in iron alloys is known at ambient pressure and influences planetary core dynamics.
  • Previously, immiscibility was thought to vanish at low pressures, necessitating further investigation under extreme conditions.

Purpose of the Study:

  • To investigate liquid-liquid immiscibility in iron alloys at high pressures relevant to planetary cores.
  • To determine the conditions under which immiscibility occurs in Fe-S-H(±Si,O,C) systems.

Main Methods:

  • High-pressure experiments simulating core conditions.
  • Analysis of immiscible liquid formation in iron-sulfur-hydrogen systems.

Main Results:

  • Discovery of immiscible S(±Si,O)-rich and H(±C)-rich liquids above ~20 GPa, relevant to the Martian core.
  • Observation of liquid immiscibility in Fe-S-H(±Si,O,C) up to 118 GPa, suggesting implications for Earth's outer core.

Conclusions:

  • The observed immiscibility in the Martian core composition could explain its core convection and magnetic field history.
  • Immiscibility in Earth's upper outer core may form a low-velocity layer beneath the core-mantle boundary.