Thermal conductivity measurements of deep Earth materials under high pressure

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Thermal diffusivity, thermal conductivity and heat capacity of mantle materials were measured under high pressure using a pulse heating method in a Kawai-type apparatus. Hydrous minerals, such as serpentine and talc show particular behavior in heat capacity. In contrast with olivine, one of the major mantle minerals, these hydrous minerals have distinct pressure-or temperature-change in thermal diffusivity and thermal conductivity. This will cause the temperature fluctuation in the subduction zone. Next we extended the pressure range from 10 Gpa to 15 Gpa using the similar sample assembly with a smaller pressure cell. This cell promises further measurements by the same method at the conditions of the transition zone and the lower mantle.