Other
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmmr21a..07b&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #MR21A-07
Other
1015 Composition Of The Core, 3924 High-Pressure Behavior, 8115 Core Processes (1213, 1507), 8124 Earth'S Interior: Composition And State (1212, 7207, 7208, 8105), 8147 Planetary Interiors (5430, 5724, 6024)
Scientific paper
We have investigated the partitioning of U between silicate and Fe or Fe-10 wt% S liquid at pressures (P) of 0 to 14.5 GPa and temperatures (T) of 1650 to 2500 oC using starting mixtures of olivine + uraninite + metal phase (Fe or Fe-10wt% S). The solubility of U in liquid Fe or Fe-10wt% S as measured by LA-ICP-MS, is in the range of 0.6 to 1500 ppm and increases with T and P. When P > 7 GPa and T > Tmelt of the silicate phase (olivine), the U concentration in Fe or Fe-10wt% S phases is 4 to 6 times greater than the lower T run products. Correspondingly, DU (=concentration of U in Fe or Fe-10wt% S / concentration of U in silicate) values can reach 0.031 at 8.5 GPa (using BN sample container) and 0.036 at 14.5 GPa (using graphite sample container). This implies that if the planetary cores formed from a deep magma ocean (T>Tmelt of the silicate phase), then U would have entered the planetary cores. The concentration of Si in liquid Fe (but not in Fe-10wt% S) also increases with pressure. No relation between U and Ca is found, which indicates that U may alloy with Fe directly. If Si concentration in the Fe phase can be used as an indicator of oxygen fugacity, then the increase in Si and U with pressure suggests a pressure dependent decrease in oxygen fugacity. This supports U (and possibly also Si) inclusion in the Earth's core at the time of core formation. The increase in U with P and T in the Fe-10wt% S phase also supports U entry into the Earth's core. The implications for radioactive heating in other planetary cores will be briefly discussed.
Bao Xuezhao
Fryer Brian J.
Gagnon Joel E.
Secco Richard A.
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