Host: The Mineralogical Society of Japan
The core of the terrestrial planets consists of Fe and the lighter alloying elements. Oxygen and sulfur are the candidates for the major alloying elements. Dreibus and wanke (1985) showed the composition of the Martian core is sulfur-rich. Ringwood (1977) suggested that Mars is more oxidized than the Earth. Therefore, it is important to study the melting relation of Fe-FeS and Fe-FeO-FeS systems at high pressure and temperature. We investigated the Fe-FeS and Fe-FeO-FeS systems at 23GPa, 850-1300C using a uniaxial 3000ton press installed in Tohoku University. The solidus temperature of the Fe-FeS system at 23GPa is about 1075C, whereas that of the Fe-FeO-FeS system is about 900C at the same pressure, suggesting the Martian core is partially molten.
