Obsidian hydration dating is based on the fact that

The first step concerns the calculation of a 3rd order fitting polynomial of the SIMS profile (eq.1).

The second stage regards the determination of the saturation layer, i.e. The whole computing processing is embedded in stand-alone software created in Matlab (version 7.0.1) software package with a graphical user interface and executable under Windows XP.

as a result of radiocarbon dating of associated materials).

Their initial work focused on obsidians from archaeological sites in western North America.

This sample is ground down to about 30 micrometers thick and mounted on a petrographic slide.

The hydration rind is then measured under a high-power microscope outfitted with some method for measuring distance, typically in tenths of micrometers.

Several factors complicate simple correlation of obsidian hydration band thickness with absolute age.

Temperature is known to speed up the hydration process.

Obsidian is a volcanic glass that was used by prehistoric people as a raw material in the manufacture of stone tools such as projectile points, knives, or other cutting tools through knapping, or breaking off pieces in a controlled manner.In essence it is a technique with a large resolution on a plethora of chemical elements and molecular structures in an essentially non destructive manner.An approach to OHD with a completely new rationale suggests that refinement of the technique is possible in a manner which improves both its accuracy and precision and potentially expands the utility by generating reliable chronological data. presented a model which relied solely on compositionally-dependent diffusion, following numerical solutions (finite difference (FD), or finite element) elaborating on the H profile acquired by SIMS.Obsidian obeys the property of mineral hydration, and absorbs water, when exposed to air, at well defined rate.When an unworked nodule of obsidian is initially fractured, there is typically less than 1% water present.

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