Obsidian hydration dating archaeology Freesexlivechat xxx
Several factors complicate simple correlation of obsidian hydration band thickness with absolute age.
Temperature is known to speed up the hydration process.
Over time, water slowly diffuses into the artifact forming a narrow "band," "rim," or "rind" that can be seen and measured with many different techniques such as a high-power microscope with 40-80 power magnification b) depth profiling with SIMS (secondary ion mass spectrometry), and IR-PAS (infra red photoacoustic spectroscopy).
In order to use obsidian hydration for absolute dating, the conditions that the sample has been exposed to and its origin must be understood or compared to samples of a known age (e.g.
Together these factors result in the formation of an approximately constant, boundary concentration value, in the external surface layer.
Using the end product of diffusion, a phenomenological model has been developed, based on certain initial and boundary conditions and appropriate physicochemical mechanisms, that express the HO concentration versus depth profile as a diffusion/time equation.