Measurement of physical property and spectroscopy of magmatic silicate melts at high temperature and pressure

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It is important to get the knowledge of physical property and strcture of magmatic silicate melts for the better understanding of magmatic process in the Earth. By this reason, we have tried to measure the physical properties such as density, viscosity and the glass-transition temperature of some magmatic silicate melts ; diopside-anorthite and diopside-albite binary joins. The temperature ranged from room temperature to about 1800 0C, and the pressure ranged from 1 b to 20 kb. Based on the experimental results, the relationships between physical properties and physical parameters such as chemical composition and temperature were discussed.The main results are as follows :1. The temperature dependence of viscosity of the present silicate melts can be explained using the configurational entropy theory.2. The configurational entropy of magmatic silicate melts at the glass -transition temperature is the universal constant value, 8.0+1.2 J/K amw, and coincides with the reported value for high-molecular organic substance.3. The WLF(Williams, Landel, Ferry)-equation may be the universal equation which describe the viscosity-temperature relation of magmatic silicate melt independent of chemical composition. And it may be also applicable to the high-pressure condition.4. If we recognize the points 1 and 2, we can predict the viscosity and the glass-transition temperature of mixed melt using the suitable mixing model and the data of physical property of the end member melts.