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Progress in Earth and Planetary Science
Figure 5 | Progress in Earth and Planetary Science

Figure 5

From: Natural moissanite (SiC) – a low temperature mineral formed from highly fractionated ultra-reducing COH-fluids

Figure 5

Calculated isopleths of metal composition for the ternary FeSiC alloys at 2 and 10 GPa. (a) and (c) C-content in mol-fraction; (b) and (d) Si-content in mol-fraction. Note the phase transition from the fcc to bcc alloy structure with increasing Si-content when decreasing oxygen fugacity. At the metal-forming reaction, C-contents increase with temperature and decrease with pressure, Si contents are below the lowest increment of the calculations. At 2 GPa, calculated C- and Fe-contents of the Si-alloy stable at ultra-reducing conditions are <1 mol%. Grey fields correspond to olivine+opx saturation.

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