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The pressure-temperature equilibrium curve of the reaction siderite + hematite = magnetite + CO 2  was determined in the range 5-12 kbar and 480-650 °C by piston-cylinder experiments, with NaCl as a pressure medium. Silver oxalate was used as a CO 2  source and samples were buffered at hematitemagnetite oxygen fugacity. Reaction progress was monitored by extent of CO 2  gas loss and by X-ray diffraction (XRD) analysis.

Experimental determination of siderite stability and application to Martian Meteorite ALH84001