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- W2080503407 abstract "The disproportionation products of olivine Fo90 in diamond–anvil cell experiments at about 1 Mbar are magnesian silicate perovskite Mg# ∼94 and a series of magnesiowüstites Mg# 85–90, yielding a recommended value of 0.4±0.1 for the distribution coefficient that defines the exchange of Mg and Fe2+ between the two phases (KD). The distinctive compositional trends which would signify that ferric iron had been stabilised during experiments are lacking. Pressure does not exert any significant effect on distribution behaviour, despite thermodynamic predictions of major reallocation of Fe2+ from magnesiowüstite into and in favour of perovskite, towards the base of the lower mantle. Nor does the presence of Al3+ in magnesian silicate perovskite in amounts appropriate for the lower mantle substantially modify distribution behaviour, and hence phase chemistry, provided the oxygen content of the system remains essentially constant. Wood’s [Earth Planet. Sci. Lett. 174 (2000) 341] multi-anvil study has been used to link KD with temperature and to calculate that magnesian silicate perovskite Mg# 93.0±0.6 would coexist with magnesiowüstite Mg# 82.6±0.9 just beyond the 660 km discontinuity (1800 K), whilst at the core–mantle boundary (2650 K) the corresponding values would be 91.9±0.4 and 84.9±0.8." @default.
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- W2080503407 date "2002-08-01" @default.
- W2080503407 modified "2023-10-01" @default.
- W2080503407 title "Partitioning of iron between magnesian silicate perovskite and magnesiowüstite at about 1 Mbar" @default.
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- W2080503407 doi "https://doi.org/10.1016/s0031-9201(02)00063-8" @default.
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