Abstract
We conducted grain growth and creep experiments on forsterite -enstatite system with varying volumetric fraction of these minerals under 1 atmosphere and temperature of 1260-1360 degree C. Observed grain growth velocity and grain size for primary phase becomes smaller with increasing volume fraction of secondary mineral. Overall, our results can be reproduced by previously proposed grain growth model for two solid phase system. Flow parameters such as grain size and stress exponents, activation energy are determined for a wide range of enstatite fraction. Flow laws with such parameters are well decomposed to two different flow laws for mono-phase systems of forsterite and enstatite with different grain size, respectively. Flow law including a fraction of secondary mineral can be established based on laws of grain growth in two phase system and single phase flow.
