Computer Science
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.1599s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 44, Issue 10, pp.1599-1612
Computer Science
14
Scientific paper
Ce(IV)-Ce(III) and Fe(III)-Fe(II) redox equilibria in Ca-Mg-Al-silicate melts have been individually measured with respect to the base composition, melt temperature, imposed oxygen fugacity, and multivalent element concentration (up to about 1.5 wt%). The mutual interaction of these two redox couples has been studied in analogous glasses which simultaneously contained iron and cerium. Analyses of Fe(III) concentrations in iron-cerium glasses by electron paramagnetic resonance and optical absorption spectroscopy indicate that Ce(IV) is stoichiometrically reduced by Fe(II) in the melt to produce Fe(III) and Ce(III) and that Ce(III)-O-Fe(III) complexes are formed in the melt. Consequently, it is concluded that cerium exists only as Ce(III) in basaltic magmas; cerium anomalies cannot be ascribed to the stabilization of Ce(IV) in magmas.
Lauer Howard V. Jr.
Schreiber Henry D.
Thanyasiri Thitinant
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