Experiments pertaining to the formation and equilibration of planetary cores

Details Experiments pertaining to the formation and equilibration of planetary cores Experiments pertaining to the formation and equilibration of planetary cores

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept..136j&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 136-137 (SEE N87-23341 16-91)

Physics

Geophysics

Chemical Equilibrium, Earth Core, Earth Mantle, Earth Planetary Structure, Planetary Evolution, Alloys, Chemical Reactions, Geochemistry, High Pressure, Iron Oxides

Scientific paper

The phase diagram of FeO was experimentally determined to pressures of 155 GPa and temperatures of 4000 K using shock wave and diamond-cell techniques. Researchers discovered a metallic phase of FeO at pressures greater than 70 GPa and temperatures exceeding 1000 K. The metallization of FeO at high pressures implies that oxygen can be present as the light alloying element of the Earth's outer core, in accord with the geochemical predictions of Ringwood. The high pressures necessry for this metallization suggest that the core has acquired its composition well after the initial stages of the Earth's accretion. The core forming alloy can react chemically with oxides such as those forming the mantle. The core and mantle may never have reached complete chemical equilibrium, however. If this is the case, the core-mantle boundary is likely to be a zone of active chemical reactions.

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