Physics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995e%26psl.132...75b&link_type=abstract
Earth and Planetary Science Letters, vol. 132, Issue 1-4, pp.75-86
Physics
23
Scientific paper
The equilibria controlling silica activity and oxygen fugacity ( f O 2 ) in the upper mantle are related and all sensitive to pressure. With increasing pressure, both silica activity and f O 2 will fall. Provided there is no systematic change in mantle bulk chemistry, the rate of reduction per unit GPa pressure increase may be of the order of -0.6 log bars relative to the fayalite-magnetite-quartz buffer. At that rate, one may predict (1) that C-H-O volatiles in the convecting upper mantle are dominated by methane and hydrogen, and (2) that Fe metal saturation may occur at pressures around 9 GPa. f O 2 may be a key variable to explain the fractionation of platinum-group elements between a mantle residue and a partial melt.
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