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- W3022221013 abstract "A series of multi-anvil experiments have been conducted to define the iron-rich liquidus of the iron-nickel-sulfur (FeNi-S) system at 20 GPa, the estimated pressure of the martian core-mantle boundary (CMB). The liquidus curve of FeNi-S containing about 9 wt.% Ni has a concave up shape, and is as much as 400 K lower than the liquidi previously applied to the martian core with sparse experimental constraints. Unlike existing liquidi of Fe-S and FeNi-S at 23 GPa, which predict a fully molten core for a narrow range of sulfur content between 14 and 15 wt.% S, our results are consistent with a molten state for all proposed core compositions, and establishes a new minimum CMB temperature of 1500 K for 10 wt.% S and 1250 K for 16 wt.% S. Extrapolating our FeNi-S liquidus to high pressures and comparing it to calculated areotherms, we find that three core crystallization regimes are possible. For a martian core with moderate sulfur content (10 to 13 wt.%) or lower, crystallization takes the form of iron snow near the CMB, while for cores with higher sulfur content (15-16 wt.%), solidification occurs near the center of the planet in the form of solid Fe3S. At an intermediate sulfur content of 14 wt.%, Fe3S would precipitate over a broad depth range and may appear fully molten to surface observations." @default.
- W3022221013 created "2020-05-13" @default.
- W3022221013 creator A5010103973 @default.
- W3022221013 creator A5061481399 @default.
- W3022221013 date "2020-07-01" @default.
- W3022221013 modified "2023-09-26" @default.
- W3022221013 title "Thermal state and solidification regime of the martian core: Insights from the melting behavior of FeNi-S at 20 GPa" @default.
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- W3022221013 doi "https://doi.org/10.1016/j.epsl.2020.116285" @default.
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