Abstract
Water diffusion in silicate melts is one of the key processes that controls the volcanic eruption style in subduction zones. Diffusion coefficients of water in rhyolite melts are discussed in the context of a water diffusion model that was initially proposed for silica glass. We aim to clarify fundamental properties of water diffusion within the silicate melt structure. The model explains the water concentration dependence of water diffusivity in rhyolite melt, considering the effect of the water concentration on activation energy for diffusion. The dependence of the activation energy upon the total water concentration seems to be related to a change in the structure dynamical property of the melt (i.e., viscosity). The empirical relation between water diffusivity and viscosity is also explained by our present model. We conclude that the water diffusion model proposed for silica glass can be applied to rhyolite melt. Water diffusion in rhyolite melt seems to be controlled by the same atomic process as in ...
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