Abstract
A fine grained fully-dense olivine aggregate was deformed in a D-DIA press at room temperature and pressures ranging from 3.5 to 6.8GPa, at constant strain rates between 6×10-6 and 2.2×10-5s−1. A weighted non-linear least square fit of a dataset including our results and data from other high-pressure studies to a low-temperature plasticity flow law yields a Peierls stress σP0=7.4(0.5)GPa and an activation energy E∗=232(60)kJ.mol−1. The dependence of the Peierls stress to pressure, σP=σP0(1+0.09P), appears to be larger than the value predicted by the formulation proposed by Frost and Ashby (1982). With such a dependence, the activation volume is very small (V*=1.6(1.7)cm3.mol−1). Extrapolation to natural conditions yields a viscosity of ~1023-1024Pa.s for a cold subducting slab at depths of 50–100km.
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