Conclusions
Single crystals of natural quartz containing fluid inclusions with different compositions have been deformed at temperatures ranging from 710-820°C, 1200 MPa confining pressure and 10-5-10-6 strain rate, followed by an annealing stage under stress at temperatures between 800-900°C for 1-280 hours. Samples with gaseous fluid inclusions have a significantly higher strength than samples with aqueous inclusions. After the experiments the samples contain between 1 and 30% recrystallized grains. These grains are elongated perpendicular to the shortening direction. The recrystallized grains contain fewer fluid inclusions then the starting material, but have more fluid inclusions on their grain boundaries, indicating that the fluid is swept along by the boundary during migration.