Experimental data bearing on the movement of iron in an aqueous vapor

'Hypersolidus and subsolidus hydrothermal quenching experiments on calc-alkaline plutonic rocks between 1.25 and 10 kb water pressure indicate that iron fractionates into the vapor phase. . . Subsolidus polythermal experiments on andesite and diabase corroborate the movement of iron in the vapor phase and the nucleation of hematite at approximately 500 degrees C.' The experimental data help to explain specular hematite incrustations near volcanic vents and the generation of contact-metamorphic iron-ore deposits.

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