Structure and Melting of Fe, MgO, SiO2, and MgSiO3 in Planets: Database, Inversion, and Phase Diagram

2025/03/27 by Junjie Dong, Gabriel-Darius Mardaru, Dong, Junjie +7
Earth and Planetary Sciences · Physics and Astronomy · #Astro and Planetary Science #Data Analysis #Earth and Planetary Astrophysics (astro-ph.EP) #FOS: Physical sciences #Geological and Geochemical Analysis #Geophysics (physics.geo-ph) #High-pressure geophysics and materials #Statistics and Probability (physics.data-an)

paper · doi:10.48550/arxiv.2503.21734

openalex publication_date 2025/03/27 · openalex created_date 2025/10/11 · openalex updated_date 2026/07/28

Abstract

We present globally inverted pressure-temperature (P-T) phase diagrams up to 5,000 GPa for four fundamental planetary materials, Fe, MgO, SiO2, and MgSiO3, derived from logistic regression and supervised learning, together with an experimental phase equilibria database. These new P-T phase diagrams provide a solution to long-standing disputes about their melting curves. Their implications extend to the melting and freezing of rocky materials in the interior of giant planets and super-Earth exoplanets, contributing to the refinement of their internal structure models.

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