U solubility in the core of Earth

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dc.creatorBao, Xuezhao
dc.creatorSecco, Richard A.
dc.date2006-06-26
dc.date2006-06-29
dc.date.accessioned2026-07-07T07:38:54Z
dc.date.available2026-07-07T07:38:54Z
dc.descriptionUranium is the most important heat producing element in the Earth. The presence of an appreciable amount of U in the core of Earth would have an important influence on geodynamics. In this study, the solubility of U in Fe-10wt% S and in Fe-35wt% S was measured by partitioning experiments with a mixture of peridotite, uraninite, Fe and FeS powder at pressure (P) of 0-9 GPa and temperature (T) of 1500-2200 oC. Comparisons with the run products containing pure Fe as the metal phase in our previous study and re-analysis of run products were made in this study. We found that in all run products, including Fe-10wt% S, Fe-35wt% S and pure Fe groups, the solubility and partitioning of U in the pure metal or metal-sulfide phase relative to the silicate phase (DU) increases with increasing P and T. With a molten silicate phase, DU is generally 3-6 times larger than with a solid silicate phase. While DU has a positive dependence on S concentration of the metal-sulfide phase, there is a negative correlation between Ca and U. According to our calculations based on these experimental results, if the core has formed from a magma ocean at a P of 26 GPa at its base and the core contained 10wt% S, then it could have incorporated at least 10 ppb U. Alternatively, if the core formed by percolation and contained 10wt% S, then it could have incorporated 5-22 ppb U. The geophysical implications of U in the core of Earth are discussed.
dc.description27 pages, 12 figures, 3 tables
dc.identifierhttps://arxiv.org/abs/astro-ph/0606634
dc.identifierhttp://arxiv.org/abs/astro-ph/0606634
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/121262
dc.subjectAstrophysics
dc.subjectGeophysics
dc.titleU solubility in the core of Earth
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