This measures the microscopic amount of water absorbed on freshly broken surfaces.
Obsidian hydration dating is based on the fact that
Temperature is known to speed up the hydration process.
Thus, artifacts exposed to higher temperatures, for example by being at lower elevation, seem to hydrate faster.
as a result of radiocarbon dating of associated materials).
Their initial work focused on obsidians from archaeological sites in western North America.
This latest advance, the novel secondary ion mass spectrometry–surface saturation (SIMS-SS), thus, involves modelling the hydrogen concentration profile of the surface versus depth, whereas the age determination is reached via equations describing the diffusion process, while topographical effects have been confirmed and monitored through atomic force microscopy.
Several factors complicate simple correlation of obsidian hydration band thickness with absolute age.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.A test of the model followed using results from Mount 65, Chalco in Mexico by Riciputi et al.Obsidian hydration dating was introduced in 1960 by Irving Friedman and Robert Smith of the U. Obsidian hydration dating (OHD) is a geochemical method of determining age in either absolute or relative terms of an artifact made of obsidian.This technique used numerical calculation to model the formation of the entire diffusion profile as a function of time and fitted the derived curve to the hydrogen profile.