Other
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusm.v31a..05c&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #V31A-05
Other
3612 Reactions And Phase Equilibria (1012, 8412), 3630 Experimental Mineralogy And Petrology, 3672 Planetary Mineralogy And Petrology (5410), 5400 Planetary Sciences: Solid Surface Planets, 1015 Composition Of The Core
Scientific paper
The solubility of tungsten (W) in liquid basalt between 1450 and 2400°C at 2.3GPa is only very weakly dependent on temperature but strongly dependent on Xcarbon such that Dmet/silW falls slightly with increasing temperature but Dmet/silW rises sharply with Xcarbon. The effect of T is insignificant when compared with the influence of melt composition, oxygen fugacity, and carbon. These data suggest that high magma ocean temperatures do not imply diminished W solubility; W's constraint on the temperature of a magma ocean may therefore be relaxed. We report that the use of graphite capsules for W partitioning experiments can result in carbide formation at or above 1600°C. Carbide growth accelerates with increasing T, occurring within minutes above 2000°C. Even in the absence of the carbide phase, W concentrations in silicate can plummet up to two orders of magnitude, presumably due to the formation of WC complexes in the liquid metal. WC is evidently considerably more siderophile than W or its oxide. This result is consistent with recent findings by Chabot et al. (2006) that W is anthracophile (C-loving). If carbon was an important species during core formation, its presence in the silicate and core forming alloy could have exerted a large influence on the mantle's W budget. The presence of carbide species in liquid metal may have affected the high T study of Dmet/silW by Walter and Thibault (1995). If so, the offset of two orders of magnitude between their results and those of others at moderate T may be reconciled. Removing the very high T W&T 1995 data from multiple-linear regressions of Dmet/silW as a function of T removes the discrepancy between the regressions that recover significant T variations, and individual studies that isolate the effect of T on Dmet/silW and show that there is none.
Cottrell Elizabeth
Walker Danielle
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