Dynamics of Oxidation of a Fe2+-Bearing Aluminosilicate (Basaltic) Melt

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Science  15 Nov 1996:
Vol. 274, Issue 5290, pp. 1173-1176
DOI: 10.1126/science.274.5290.1173


Rutherford backscattering spectroscopy (RBS) and microscopy demonstrate that the ∼1400°C oxidation of levitated droplets of a natural Fe2+-bearing aluminosilicate (basalt) melt occurs by chemical diffusion of Fe2+ and Ca2+ to the free surface of the droplet; internal oxidation of the melt results from the required counterflux of electron holes. Diffusion of an oxygen species is not required. Oxidation causes the droplets to go subsolidus; magnetite (Fe3O4) forms at the oxidation-solidification front with a morphology suggestive of a Liesegang-band nucleation process.