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- W207680353 abstract "The present study deals with the torsion deformation of partially molten samples of pyroxene gabbro-norite, spinel lherzolite, basalt lava and dacite pumice at high temperatures (600–1200C) and over a range of frequencies (20 Hz –2.10−3 Hz). The anelastic and viscoelastic properties of partially molten samples of rocks have been studied using oscillatory force torsion apparatus. Measurements of the complex shear modulus (G*) and internal friction (Q−1) at small strains (~ 10−7) show that samples do not possess a relaxed shear viscosity at the highest temperatures of experiments, if the melt phase is less than 60 vol%. Frequency dependence of the internal friction indicates that the viscoelasticity of the melt phase starts to overwhelm other mechanisms of anelastic behaviour at the high temperature - low frequency range ωτ 1, where ωτ is the normalised frequency. Below the softening temperature of the melt phase, there is a general dependence of Q−1 ∝ ω−0.17±0.01, where ω is the angular velocity of forced oscillations. Above the softening temperature, Q−1 ∝ ω−α where the empirical exponent α > 0.35 and depends on the melt fraction and the shape of the crystals. At low temperatures and moderate melt fractions (10–20 vol%), there may be a band of frequencies and temperatures where internal friction has a weak frequency dependence or some poorly resolved peaks. The nature of these peaks can be associated with several shear stress relaxation processes such as grain boundary sliding, rotation of grains suspended in the viscous melt, and movement of melt between adjacent melt pockets. The relative contribution of these relaxation processes depends on the melt fraction, grain size and normalised frequency ωτ." @default.
- W207680353 created "2016-06-24" @default.
- W207680353 creator A5066363136 @default.
- W207680353 date "2000-01-01" @default.
- W207680353 modified "2023-10-16" @default.
- W207680353 title "Anelastic and Viscoelastic Behaviour of Partially Molten Rocks and Lavas" @default.
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- W207680353 doi "https://doi.org/10.1007/978-94-011-4016-4_2" @default.
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