The system iron-enstatite-water at high pressures and temperatures-formation of iron hydride and some geophysical implications

Details The system iron-enstatite-water at high pressures and temperatures-formation of iron hydride and some geophysical implications The system iron-enstatite-water at high pressures and temperatures-formation of iron hydride and some geophysical implications

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pepi...36..135s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 36, Issue 2, p. 135-144.

Physics

21

Scientific paper

The system iron-enstatite-water was investigated at pressures around 5 GPa and at temperatures ranging from 1000 to 1200°C, using several different kinds of starting materials. Quenched samples showed the coexistence of iron, olivine and pyroxene. Synthesis of the Fe-containing olivine in the run products proves that a series of reactions, Fe + H2O --> FeHx + FeO and FeO + MgSiO3 --> (Mg, Fe)2SiO4, have taken place. Spherical ``balls of iron'' were observed in the 1200°C run. This strongly indicates that the melting temperature of iron decreased by ~ 500 K by the possible dissolution of hydrogen. Following geophysical implications are derived from these experimental results. If water was retained in the hydrous minerals in the primordial material, the iron-water reaction is expected to occur throughout the core-formation process. The reaction product FeHx will melt and then sink to form a proto-core and iron oxide will be dissolved in the Earth's mantle. The dissolution of hydrogen in the Earth's core is a natural consequence of the core-formation process.

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