Phase relations in the Fe-O-S system at high pressures

Details Phase relations in the Fe-O-S system at high pressures Phase relations in the Fe-O-S system at high pressures

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmmr13a0058t&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #MR13A-0058

Other

1015 Composition Of The Core, 3630 Experimental Mineralogy And Petrology, 3924 High-Pressure Behavior

Scientific paper

Geophysical observation implies that Earth's outer core contains about 10 % of the light elements. Investigations of the phase relations in iron-light element system are essential for understanding the composition and dynamics in the Earth's core. Since oxygen and sulfur are the major candidates for the planetary cores such as the Earth and Mars, we have investigated the phase relations in the Fe-O binary and the Fe-O-S ternary systems in the range of 15-21 GPa and 2098-2578 K. High-pressure and high-temperature experiments were performed using a Kawai-type multi-anvil apparatus installed at Tohoku University, and the recovered run products after quenching were analyzed using a scanning electron microscope and an electron probe microanalyzer. We have determined the immiscible two-liquid regions above the liquidus temperatures, at 15 GPa and 2302 K, 18 GPa and 2394 K, and 21 GPa and 2578 K. An immiscible liquid region in the Fe-O system does not change so much with pressure and temperature. On the other hand, an immiscible liquid region in the Fe-O-S system narrows significantly with increasing pressure and temperature. The present results have important implications for the cores of terrestrial planets like Earth and Mars. Extrapolation of the present results on the immiscibility of the Fe-O-S system to higher pressure suggests that there is no immiscible liquids in the Earth's core.

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