Flow-law for ringwoodite at subduction zone conditions

Details Flow-law for ringwoodite at subduction zone conditions Flow-law for ringwoodite at subduction zone conditions

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pepi..136....3x&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 136, Issue 1-2, p. 3-9.

Physics

Scientific paper

The plastic properties of ringwoodite, a high-pressure modification of olivine, are experimentally determined at the pressure of 20GPa and temperatures up to 1350°C. Stress relaxation experiments have been carried out on fine-grained samples using a two-stage T-cup multiple anvil high-pressure apparatus with synchrotron-generated X-rays. We observe the presence of a significant weakening of the shear strength with a decrease from 2.5 to 0.2GPa between 600 and 1000°C. In this region, the activation energy, U, is about 275kJ/mol and it decreases with increasing stress, reaching a value of about 200kJ/mol when the shear stress attains 2.5GPa. We propose that the plasticity is associated with vigorous dislocation glide controlled by short-range lattice resistance forces. At lower temperatures, the shear strength is mildly dependent on temperature reaching 3GPa at room temperature, while above 1000°C, the flow may be governed by a power-law relation with n about 3.5.

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