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- W2023306659 abstract "Viscoelastic properties of basalt melts of a wide range of composition are determined from ultrasonic compressional wave velocity V p and quality factor Q p measurements in the frequency range of 3.4–22 MHz and the temperature range of 1150°–1500°C. The basalt samples are grouped into two types: low magnesia (group A) containing 5–9 wt % MgO and high magnesia (group B) containing 18–23 wt % MgO. The V p values of the melts determined at 1400°C are in the range 2.53–2.64 km/s for group A basalts and 2.79–2.86 km/s for group B basalts. The relaxed (low frequency) velocity V r is a principally linear function of the melt density ρ. Least squares fits of the data give velocity‐density relations V r (km/s) = 0.691 + 0.712ρ (g/cm 3 ) for group A basalts and V r = 0.328 + 0.907ρ for group B basalts at 1400°C. The mean molecular weights M are 65.0 ± 0.3 and 58.2 ± 0.5 g/mol for groups A and B basalts, respectively, suggesting that M is also a principal factor determining the melt velocity. The relaxed modulus M r of the basalt melts range from 16.5 to 22.8 GPa and is also a linear function of the melt density. The values of longitudinal η L and volume η v viscosities are calculated from the measured V p and Q p and the available shear viscosity η s data. The viscosities and related activation energies decrease almost linearly as NBO/T (nonbridging oxygens per tetrahedrally coordinated cation) increases." @default.
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- W2023306659 date "1986-08-10" @default.
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- W2023306659 title "Ultrasonic velocity and attenuation measurements on basalt melts to 1500°C: Role of composition and structure in the viscoelastic properties" @default.
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- W2023306659 doi "https://doi.org/10.1029/jb091ib09p09333" @default.
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