Liquid miscibility during the evolution of Earth and planetary cores

Details Liquid miscibility during the evolution of Earth and planetary cores Liquid miscibility during the evolution of Earth and planetary cores

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmmr21a..01l&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #MR21A-01

Other

1015 Composition Of The Core, 3924 High-Pressure Behavior, 8124 Earth'S Interior: Composition And State (1212, 7207, 7208, 8105), 8125 Evolution Of The Earth (0325), 8412 Reactions And Phase Equilibria (1012, 3612)

Scientific paper

The core is the largest magma chamber in the Earth. Liquid miscibility, if present in the core-forming alloy system, may influence the extent of chemical equilibrium and the process of physical segregation between the two dominant divisions of the Earth. As the Earth cools, the outer core may enter the miscibility gap and develop new layering. Further differentiation in the core would have direct impact on the structure and dynamics of the planet. Fe-rich core is not unique to the Earth. It is likely to exist in other terrestrial planets and in some major moons of giant planets. In order to evaluate the relevance and understand the role of liquid miscibility during the evolution of the Earth and planetary cores, we have conducted high-pressure experiments on liquid miscibility. A number of candidate core alloy compositions have been studied, including binary Fe-S system, ternary Fe-S-O and Fe-S-C systems, and quaternary Fe-Ni-S-O and Fe-Ni-S-C systems. Experimental conditions range from 2 to 25 GPa, and between 1273 and 2500 K. Based on the new data, we will evaluate 1) if liquid miscibility can provide additional constraints on core compositions; 2) if liquid miscibility existed, exists, or will occur during the evolution of the Earth and planetary cores.

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