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Solution-precipitation enhanced diffusional creep of partially molten olivine-basalt aggregates during hot-pressing



Solution-precipitation enhanced diffusional creep of partially molten olivine-basalt aggregates during hot-pressing



Tectonophysics 107(3-4): 207-233



Densification (creep) rate data on polycrystalline olivine both with and without the liquid basalt were collected as functions of applied stress/pressure (5-30 MPa), temperature (1300 degrees -1400 degrees C) and grain size (3-13 mu m). Olivine-liquid basalt aggregates creep at rates which are persistently a factor of 2-5 greater than similar, melt-free specimens. Creep rate is enhanced by a solution-precipitation (pressure solution) mechanism during densification. The stress exponent (n = 1), grain-size exponent (m = 3) and average thermal activation energy (Q congruent to 380 kJ/ mole) determined for the densification experiments are the same for olivine and olivine-basalt specimens. The creep rate enhancement measured for olivine-basalt specimens occurs because the diffusive path length is effectively reduced by the presence of melt at triple junctions.--Modified journal abstract.

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Accession: 020044769

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DOI: 10.1016/0040-1951(84)90252-x


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