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Progress in Earth and Planetary Science
Figure 2 | Progress in Earth and Planetary Science

Figure 2

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

Figure 2

Calculated f O 2 -temperature diagrams for carbon-bearing harzburgitic peridotite simplified in Mg-Fe-Si-C-O 2 at (a) 2 GPa and (b) 10 GPa. The saturation hierarchy at moderately oxidizing conditions is chosen as olivine > orthopyroxene > graphite/diamond > magnetite. The FMQ, CCO and IW buffers are given for reference. Squares are calculated oxygen fugacities for the experiments, red fill for f O2 ’s calculated from the iron silicide involving equilibria (1) and (2), black fill for f O2 ’s calculated from the SiC-involving reaction (7).

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