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- W1970592296 abstract "Using both high- and low-iron starting materials, 129 liquids are equilibrated with metallic Fe under controlled oxygen fugacity at 1600 K to contour for aFeO the geologically relevant portion of the system [SiO2-KAlO2-CaAl2Si2O8]-FeO (SKAnF). The data show changes of aFeO-XFeO relations caused by systematic variation of Matrix composition in pseudobinaries of the type Matrix-FeO. The results clearly demonstrate that decrement of XAnMatrix(= 1 − XKAlO2Matrix − XSiO2Matrix) and increment of XKAlO2MatrixXSiO2Matrix both cause the activity coefficient (γFeO) to increase. Importantly, the aFeO − XFeO curves are flattened in the same compositional range where liquid immiscibility occurs at lower temperatures. A simple empirical ideal mixing model is proposed by assuming that magma consists of a variously interconnected polymeric network that is unaffected by the substitutions of Na for K and Mn, Mg and Ca for Fe. Furthermore, the components of magma are assumed to be SiO2, (Na, K)AlO2, CaAl2Si2O8, TiO2 and the divalent cation oxides. The model is used to predict aFeO at 1600 K in multicomponent magma from the above data for SKAnF liquids. The excellent agreement between the calculated and measured values of the activity of FeO supports this model. The above assumptions are thus good approximations to physical reality. The predictions of the model for other properties of magma (i.e. activities of other components, molar volumes, viscosities) are remarkably simple." @default.
- W1970592296 created "2016-06-24" @default.
- W1970592296 creator A5047409654 @default.
- W1970592296 date "1988-07-01" @default.
- W1970592296 modified "2023-09-30" @default.
- W1970592296 title "Prediction of the activity of FeO in multicomponent magma from known values in [SiO2-KAlO2-CaAl2Si2O8]-FeO liquids" @default.
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- W1970592296 doi "https://doi.org/10.1016/0016-7037(88)90006-3" @default.
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