Abstract

The data indicate that iron carbide, Fe 3 C, is metastable with respect to the assemblage graphite + iron at magmatic temperatures and pressures up to 2 kbar. The phase relations show that native iron can result from the ascent of graphite-bearing mafic magma. The phase equilibria suggest that cohenite rims on iron grains and iron oxide liquids can be generated by oxidation processes during cooling.--Modified journal abstract.

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