[S-MP42] Physics and Chemistry of Minerals

[SMP42-P03] Viscosity of KAlSi3O8 melt under high pressure

*Akio SUZUKI¹ (1.Tohoku University)

Keywords:magma, viscosity, high pressure, mantle, synchrotron radiation

Viscosity is a fundamental property controlling the transportation of magma in the planetary interiors. In this study, we measured the viscosity of KAlSi₃O₈ composition of melt under high pressure. The viscosity was measured by the falling sphere method using an X-ray radiography system. Experiments were performed at the NE7A station of the PF-AR synchrotron radiation facility in KEK, Tsukuba, Japan. High pressure was generated using a Kawai-type apparatus driven by a DIA-type guide block in the MAX-III press. A powder of natural sanidine (KAlSi₃O₈) was loaded with a platinum sphere in a molybdenum container. Powder X-ray diffraction data were obtained by energy-dispersive method using an pure Ge solid state detector. Pressures were determined by using an equation of state of MgO. The results show that the viscosity of KAlSi₃O₈ melt decreased with increasing pressure up to 6 GPa.