Abstract
In hydrothermal quartz from the Kaneuchi tungsten deposit of Honsyu island, Japan, the smaller primary fluid inclusions have the power δ18O values. This correlation is well accounted for by a quantitative model based on (isotropic or anisotropic) 18O diffusion through quartz. The model yields a room temperature 18O diffusivity that is close to the extrapolated diffusivity of water molecules measured by Cordier (1988) but much higher than the extrapolated diffusivity of structural oxygen measured by Farver and Yund (1991). The observed correlation between the size of primary fluid inclusions in quartz and their δ18O(water) is thus, well explained by relatively fast diffusion of oxygen as water molecules.
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