Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmmr21a..04c&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #MR21A-04
Physics
1015 Composition Of The Core, 1065 Major And Trace Element Geochemistry, 3621 Mantle Processes (1038), 3630 Experimental Mineralogy And Petrology, 3672 Planetary Mineralogy And Petrology (5410)
Scientific paper
A new high temperature piston cylinder design has enabled the measurement of platinum solubility in mafic melts at temperatures up to to 2500°C, 2.2GPa pressure, and under reducing conditions for 1 - 10 hours. These high temperatures and low fO2 conditions may mimic a magma ocean during planetary core formation. Under these conditions, we measured tens to hundreds of ppm Pt in the quenched silicate glass corresponding to DPtmetal/silicate ~ 103-4, 4 to 12 orders of magnitude lower than extrapolations from high fO2 experiments at 1 bar and at temperatures no higher than 1550°C. Moreover, the new experiments provide strong evidence that noble metal micronuggets, ubiquitous in experimental studies of the HSE, can be produced on quench. We measure equally high Pt concentrations in nugget-bearing and nugget-free regions of the quenched silicate, consistent with the quench interpretation. We find that both temperature and melt composition exercise strong control on DPtmetal/silicate and that Pt0 and Pt+1 may contribute significantly to the total dissolved Pt such that low fO2 does not imply low Pt solubility. Equilibration of metal alloy with liquid silicate in a hot primitive magma might not have depleted platinum to the extent previously believed.
Cottrell Elizabeth
Walker Danielle
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