Dynamics of oxidation of a Fe2+-bearing aluminosilicate (basaltic) melt

Dynamics of oxidation of a Fe2+-bearing aluminosilicate (basaltic) melt

Rutherford backscattering spectroscopy (RBS) and microscopy demonstrate that the approximately 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 me...

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Veröffentlicht in:Science (American Association for the Advancement of Science) 1996-11, Vol.274 (5290), p.1173-1176
Hauptverfasser: COOPER, R. F, FANSELOW, J. B, WEBER, J. K. R, MERKLEY, D. R, POKER, D. B
Format: Artikel
Sprache:eng
Schlagworte:
Aluminosilicates
Aluminum silicates
Crystalline rocks
Earth sciences
Earth, ocean, space
Exact sciences and technology
Experimental petrology
Oxidation-reduction reaction
Oxidation-reduction reactions
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Zusammenfassung:Rutherford backscattering spectroscopy (RBS) and microscopy demonstrate that the approximately 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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.274.5290.1173