Add time:08/01/2019         Source:sciencedirect.com

We have performed experiments at 1.5 GPa over the temperature range 1400–2100 °C to determine the partitioning of lithophile elements (U, Th, Eu, Sm, Nd, Zr, La, Ce, Yb) between sulfide liquid, low-S metals and silicate melt. The data demonstrate pronounced increases in partitioning of all the lithophile elements into sulfide at very low FeO contents (<1 wt%) of the silicate melt such that DU=[U]sulfide[U]silicate exceeds 1 and may be >10 in some cases. Similarly DSm may be >2 under the same conditions of low silicate FeO. This strong partitioning behaviour is found only be important in S-rich metals, however because the observed effect of low FeO on partitioning is uniquely confined to metallic melts close to stoichiometric FeS in composition.The results and the effects of FeS content of the metal and FeO content (or activity) of the silicate may be understood in terms of exchange reactions such as:UO2+2FeS=2FeO+US2

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