The thermal stability of siderite (FeCO(3)) was studied by two independent methods in which the oxygen fugacity of the gas phase was controlled by equilibration with graphite. Both series of experiments indicate that siderite decomposes stably to magnetite + graphite between 455 degrees and 465 degrees C at 500 to 2000 bars PCO2 + P(CO).
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French et al. (1965) studied this question.
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