Physics
Scientific paper
Jan 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pepi..160...75t&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 160, Issue 1, p. 75-85.
Physics
13
Scientific paper
We have determined phase relations in the Fe O and Fe O S systems in the range of 15 21 GPa and 1825 2300 °C. Below the liquidus temperatures, solid FeO and metallic liquids are observed in both the Fe O and the Fe O S systems. An immiscible two-liquid region exists in the Fe O binary system in the pressure range investigated, and the immiscibility gap between Fe-rich metallic liquid and FeO-rich ionic liquid does not greatly change with either pressure or temperature. On the other hand, an immiscible two-liquid region in the Fe O S ternary system narrows significantly with increasing pressure at constant temperature and vice versa, and it almost disappears at 21 GPa, and 2300 °C. Immiscible two-liquid regions are thus not expected to exist in the Fe O S system in the Earth's core, suggesting that both oxygen and sulfur can be incorporated into the core. Our results are consistent with a geochemical model for the core containing 5.8 wt.% oxygen and 1.9 wt.% sulfur as proposed by McDonough and Sun [McDonough, W.F., Sun, S.-S., 1995. The composition of the Earth. Chem. Geol. 120, 223 253].
Ohtani Eiji
Terasaki Hidenori
Tsuno Kyusei
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