RELATIONSHIPS BETWEEN DYNAMICALLY RECRYSTALLIZED GRAIN-SIZE AND DEFORMATION CONDITIONS IN EXPERIMENTALLY DEFORMED OLIVINE ROCKS

New microstructural data on experimentally deformed ''wet'' and ''dry' ' natural olivine rocks (Anita Bay and Aheim dunite), together with th e other reliable experimental data, indicate that the experimental str ess - recrystallized grain size relationship in olivine-rocks is large ly independent of water content and temperature, and is only slightly dependent on the flow properties of the material. The experimental dat a cover a stress range of 30-300 MPa, water contents from <30 ppm to 3 00 ppm, and temperatures in the range 1100-1650-degrees-C. Local melt contents of up to 10 volume% cannot be demonstrated to have a signific ant effect on the stress - grain size relationship.