Garnet Growth in the Early Stage of Trachybasalt-Eclogite Transformation

Garnet growth in the early stage of trachybasalt-eclogite transformation was observed at 2.0GPa and temperature of 860°C, 940°C and 1020°C for annealing times of 0.66-13.6h. The grain size was determined optically to be increased with increasing annealing time. The growth rate decreased with increasing grain size. The garnet growth law was: G^2.46 = 5.65 x 10^-15 t exp-27.40 x 10³/RT, where G represents the average grain size after annealing time t, R is gas constant and T is absolute temperature.