Effect of redox conditions on iron metal phase segregation during experimental high-temperature centrifuge modeling of the origin of the Moon’s core

The possible origin of the Moon’s metallic core at the precipitation of iron–sulfide phases during the partial melting of ultramafic material under various redox conditions was experimentally modeled by partially melting the model system olivine (85 wt %) + ferrobasalt (10 wt %) + metallic phase Fe...

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Bibliographic Details
Published in:Geochemistry international 2016-07, Vol.54 (7), p.609-617
Main Authors: Lebedev, E. B., Averin, V. V., Lukanin, O. A., Roshchina, I. A., Kononkova, N. N., Zevakin, E. A.
Format: Article
Language:English
Subjects:
Centrifuges
Droplets
Earth and Environmental Science
Earth Sciences
Geochemistry
High temperature
Iron
Melting
Melts
Metals
Moon
Origins
Phase transitions
Segregations
Silicates
Sulfides
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Summary:The possible origin of the Moon’s metallic core at the precipitation of iron–sulfide phases during the partial melting of ultramafic material under various redox conditions was experimentally modeled by partially melting the model system olivine (85 wt %) + ferrobasalt (10 wt %) + metallic phase Fe 95 S 5 (wt %) in a high-temperature centrifuge at 1430–1450°C. The oxygen fugacity f O 2 was determined from the composition of the quenched experimental silicate melts (glasses). A decrease in f O 2 is proved to be favorable for the segregation of iron–sulfide melt from the silicate matrix. The metallic phase is most effectively segregated in the form of melt droplets, and these droplets are accumulated in the lower portions of the samples under strongly reduced conditions, at f O 2 ∼ 4.5–5.5 orders of magnitude lower than the iron–wüstite buffer.
ISSN:0016-7029
1556-1968
DOI:10.1134/S0016702916070053