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- W1979114968 abstract "A high pressure investigation of melting relationships in the Fe–S–Si system has been conducted in a multi-anvil apparatus from 10 to 27 GPa and up to 2343 K. At 1 atm, the Fe–S–Si ternary system exhibits a vast miscibility gap [Raghavan, V., 1988. Phase diagrams of ternary iron alloys. Part 2: Ternary systems containing iron and sulphur. Indian Institute of Metals, Calcutta]. Quenched samples from experiments conducted at 10 and 12 GPa show an emulsion of immiscible liquids (an Fe–S melt and an Fe–Si melt). The liquid miscibility gap persists to at least 2343 K at 10 GPa. At 15 GPa, only one liquid is quenched, with a fine homogeneous dendritic texture. The results provide a mechanism to incorporate both S and Si as the light elements into the Earth’s core during a moderately high-pressure differentiation, consistent with geochemical models predicting up to 15 wt.% of light elements in the Earth’s core with 2–5 wt.% S and 7–10 wt.% Si. In contrast, for small planets such as Mars and Ganymede, differentiation took place within the pressure range of the miscibility gap. The composition of these cores is likely to be S-rich but Si-poor." @default.
- W1979114968 created "2016-06-24" @default.
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- W1979114968 date "2004-10-01" @default.
- W1979114968 modified "2023-09-30" @default.
- W1979114968 title "Closure of the Fe–S–Si liquid miscibility gap at high pressure" @default.
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- W1979114968 doi "https://doi.org/10.1016/j.pepi.2004.06.008" @default.
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