Contrasting viscoelastic behaviour of melt-free and melt-bearing olivine: Implications for the nature of grain-boundary sliding
Jackson, Ian; Faul, Ulrich; Fitz Gerald, John; Morris, Stephen
Melt-free and basaltic (complex alumino-silicate) melt-bearing specimens of fine-grained polycrystalline olivine (Mg0.9Fe0.1)2SiO4, tested at high temperature and low frequency in torsional forced oscillation and microcreep, display markedly different behavior. For the melt-bearing materials, superimposed upon the high-temperature background is a dissipation peak whose height varies systematically with melt fraction that is attributed to elastically accommodated grain-boundary sliding...[Show more]
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