Tóm tắt
The partitioning of ferric iron between chromian spinel and basic silicate melt was studied experimentally. Runs were carried out at temperatures of 1 180-1 300 °C and oxygen fugacities of 10-3-10-9 atm, at one atmosphere total pressure. A linear relationship exists between the Fe2O3 content of chromian spinel (known by microprobe analysis) and the Fe2O3 content of the liquid (calculated from the empirical relation established by Kilinc et al., 1983). The partition coefficient, DT = (Fe2O3)sp/(Fe2O3)liq, depends on temperature, but neither on fO2 nor on the Fe total content of the melt : log DT = 4 8 13/T — 2.39. The Fe2O3 content of spinel is related to physico-chemical parameters as follows :
[formula]
It is pointed out that, at constant temperature and oxygen fugacity, (Fe2O3)sp is a linear function of the total iron content of the melt.
