Abstract
The hydration of obsidian is studied by measuring hydrogen concentration profiles of natural samples hydrated at 90°C, using the 15N resonance nuclear reaction method. The results of this study are well reproduced by the interdiffusion model of Doremus. The importance of the non-amorphous phase of obsidian is discussed. It is pointed out that the precision methods of measuring hydration profiles now available make it practical to measure hydration rates at room temperature experimentally.
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