Mutual interactions of redox couples via electron exchange in silicate melts - Models for geochemical melt systems

Details Mutual interactions of redox couples via electron exchange in silicate melts - Models for geochemical melt systems Mutual interactions of redox couples via electron exchange in silicate melts - Models for geochemical melt systems

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.9233s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Aug. 10, 1987, p. 9233-9245. Research supported by E.I. DuPont de Nem

Physics

6

Basalt, Geochemistry, Magma, Redox Cells, Silicates, Buffers (Chemistry), Lunar Rocks, Meteorites, Planetary Geology, Vitrification

Scientific paper

The mutual interactions via electron exchange of redox couples in glass-forming melts were investigated both theoretically and experimentally. A thermodynamic approach for considering the mutual interactions leads to conclusion that the degree of mutual interaction in the melt should be proportional in part to the difference in relative reduction potentials of the interacting redox couples. Experimental studies verify this conclusion for numerous redox couples in several composition/temperature/oxygen fugacity regimes. Geochemical systems simultaneously possess many potentially multivalent elements; the stabilized redox states in the resulting magmas can be explained in part by mutual interactions and by redox buffering through the central Fe(III)- Fe(II) couples in the melts. The significance of these results for basaltic magmas of the earth, moon, and meteorites is addressed.

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