Effect of oxygen fugacity on trace-element partitioning between immiscible silicate melts at atmospheric pressure

a proton and electron microprobe study

Edward Vicenzi*, Trevor Green, Soey Sie

*Corresponding author for this work

    Research output: Contribution to journalArticle

    16 Citations (Scopus)

    Abstract

    The partitioning behaviour for the trace elements Rb, Sr, Ba, Th, U, Zr, Hf, Nb, Ta, La, Ce, Sm, Ho, Lu and Y between immiscible Fe-rich, Si-poor and Fe-poor, Si-rich silicate liquids in the system K2O-Al2O3-SiO2-FeO-Fe2O3-P2O5 at 1265°C, 1 atm was determined as a function of oxygen fugacity in the range of log fO2 from -8.7 to -5.7. The miscibility gap for all major elements is enlarged and the partition coefficients for Sr, Ba and U increase and Rb decreases with increasing fO2. The partition coefficients for the remaining trace elements stay nearly constant. Thus it is predicted that the partitioning of Sr, Ba, U and Rb between crystals and melt will show increasing dependence on melt composition as fO2 is increased, but the compositional dependence of the crystal/melt partition coefficients for the other elements will remain unchanged.

    Original languageEnglish
    Pages (from-to)355-360
    Number of pages6
    JournalChemical Geology
    Volume117
    Issue number1-4
    DOIs
    Publication statusPublished - 1 Nov 1994

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