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• W2080803297 abstract "The densities of 27 liquids in the system Na2O-K2O-MgO-MgO-FeO-Fe2O3-Al2O3-TiO2-SiO2 have been measured using the double-bob Archimedean technique. These results indicate that multicomponent silicate liquid volumes have a linear dependence on composition with the exception of the TiO2 component. The equation: V(T) = ∑Xi(T)Vi(T) + XNa2OXTiO2VNa2O-TiO2 was used to derive values of the oxide partial molar volumes (V̄i) by the method of least squares. Regressions were made separately at 1573, 1673, 1773 and 1873 K (as liquid ferric-ferrous ratios change with temperature) with relative standard errors for each fit of 0.38%, 0.32%, 0.30% and 0.32%, respectively. Derived dV̄i/dT values by separate least squares regression for each oxide component reproduce the measured dV/dT of the experimental liquids by 20.21% on average. The effects of iron redox state on the density of a variety of natural liquids are demonstrated and at most amount to a variation of 1%. These new data on silicate liquid volumes were used to re-derive oxide partial molar compressibilities, dV̄i,T/dP and ́gbiT, at 1 bar from ultrasonic velocity and calorimetric data from the literature. The fits for dV̄i,T/dP and ́gbi,T at 1673 K have relative standard errors of 3.9% and 1.8%, respectively, which represent substantial improvements over previous fits. Two applications of these volume data are given: firstly, the fusion curve of diopside is calculated up to 95 kbr using an equation of state for liquid volume expressed as: V(T, P) = V(T) exp ∝ -β(T)(1 − bP+cP2)dP (where β = K−1 and therefore dK/dP = K′ = −β−2dβ/dP); secondly, using a range of K′ appropriate to a komatiite liquid, the pressure-temperature conditions where the density of the liquid equals that of its olivine phenocrysts are calculated." @default.
• W2080803297 created "2016-06-24" @default.
• W2080803297 creator A5034708501 @default.
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• W2080803297 date "1987-11-01" @default.
• W2080803297 modified "2023-10-18" @default.
• W2080803297 title "Densities of Na2O-K2O-CaO-MgO-FeO-Fe2O3-Al2O3-TiO2-SiO2 liquids: New measurements and derived partial molar properties" @default.
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• W2080803297 doi "https://doi.org/10.1016/0016-7037(87)90368-1" @default.
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