Obsidian hydration dating

14-Sep-2016 20:36

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If you can determine the rate at which water diffuses into the glass for that particular chunk of obsidian (that's the tricky part), you can use OHD to determine the absolute age of objects.The relationship is disarmingly simple: Age = DX2, where Age is in years, D is a constant and X is the hydration rind thickness in microns.► New approaches of hydrated surface layer by using Fick's law of diffusion.

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By modeling the profile of the surface hydrogen concentration versus depth the age determination is reached via equations describing the diffusion process.

Some obsidians hydrate faster than others, even within the exact same depositional environment.