Metal-silicate-water reaction under high pressure. I. Formation of metal hydride and implications for composition of the core and mantle

Details Metal-silicate-water reaction under high pressure. I. Formation of metal hydride and implications for composition of the core and mantle Metal-silicate-water reaction under high pressure. I. Formation of metal hydride and implications for composition of the core and mantle

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...56..377s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 56, Issue 3-4, p. 377-388.

Physics

8

Scientific paper

The system (transition metal)-silicate-water was investigated at pressures around 5 GPa and at temperatures ranging from 1000 to 1300°C using a tetrahedral anvil type of high pressure apparatus. Quenched samples showed the coexistence of (transition metal oxide)-bearing silicates, e.g., olivine, pyroxene and garnet, and metal hydride and/or pure metal. Ti-, V-, Cr-, and Mn hydride were successfully quenched to normal conditions, but Fe-, Co-, and Ni hydride were unquenchable. These results indicate that the reaction of the metal and water took place under high pressure and at high temperature, and produced metal hydride and metal oxide. Although Fe-, Co-, and Ni hydride must have existed at high pressure, they could not be recovered because they were decomposed into metal and hydrogen under normal pressure. In the V-silicate-water system, dendritic texture was found on some metallic grains in the run at temperature > 1300°C. Coexistence of hydrogen and oxygen in the molten vanadium was demonstrated in such metallic grains. This suggests the possibility of the coexistence of hydrogen and oxygen in the Earth's core.

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