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• W4243926311 abstract "Experiments have been conducted to investigate the effect of melt on the creep behavior of water‐free olivine aggregates deformed in the dislocation creep regime. The influence of the melt phase is modest at melt fractions less than ∼0.04. However, at melt fractions > 0.04, the creep rate of melt‐added samples is enhanced by more than an order of magnitude relative to melt‐free aggregates. This unexpectedly large influence of melt on strain rate arises because deformation occurs by grain boundary sliding (GBS) accommodated by a dislocation creep process. Four observations support this hypothesis. (1) The strain rate enhancement observed in the dislocation creep regime can be related to the stress concentration caused by the reduction in the solid‐solid grain boundary area. (2) Both melt‐free and melt‐added samples exhibit strain rates indicating that deformation is limited by slip on (010)[100], the easiest slip system in olivine. (3) The GBS mechanism occurs near the transition between diffusion and dislocation creep. (4) Grains in specimens deformed in the GBS regime are not significantly flattened, even after ∼50% shortening. In melt‐free aggregates, a transition from the GBS mechanism to dislocation creep limited by slip on (010)[001], the hardest slip system, is observed with an increase in grain size. A transition to (010)[001] limited creep was not observed for partially molten aggregates because grain growth was inhibited by the presence of melt. The results of this study indicate that the viscosity of the upper mantle may decrease by at least an order of magnitude if the retained melt fraction exceeds 0.04 or if the onset of melting results in a reduction in grain size and a concomitant transition from (010)[001] to (010)[100] limited creep." @default.
• W4243926311 created "2022-05-12" @default.
• W4243926311 creator A5060121595 @default.
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• W4243926311 date "1995-08-10" @default.
• W4243926311 modified "2023-10-17" @default.
• W4243926311 title "Experimental constraints on the dynamics of the partially molten upper mantle: 2. Deformation in the dislocation creep regime" @default.
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• W4243926311 doi "https://doi.org/10.1029/95jb01292" @default.
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