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1999; Skinner 1995; Rogers 2008, 2010; Liritzis and Laskaris 2011), and there is no assurance that artifacts recovered from similar provenances or locales have shared thermal and cultural histories.
Is Obsidian Hydration Dating Affected by Relative Humidity?
The potential of the method in archaeological chronologic studies was quickly recognized and research concerning the effect of different variables on the rate of hydration has continued to the present day by Friedman and others.
When this hydrated layer or rind reaches a thickness of about 0.5 microns, it becomes recognizable as a birefringent rim when observed as a thin section under a microscope. In Chronometric Dating in Archaeology, edited by R.
Four rim measurements are typically recorded for each artifact or examined surface.
Narrow rinds (under approximately two microns) are usually examined under a higher magnification.
The most important of these are chemical composition and temperature, although water vapor pressure and soil alkalinity may also play a role in some contexts.
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I selected obsidian hydration because I know nothing about it and love to learn.“adsorption of water on exposed surfaces of obsidian; if the local hydration rate is known and constant, this phenomenon can be used as a relative dating technique through measurement of thickness of the hydration” (Ashmore and Sharer, Discovering Our Past, 2010 p 270)“ In 1960, Irving Friedman and Robert Smith announced a new age-determination technique called obsidian hydration, based on the cumulative adsorption of water by volcanic glass.” ” (Ashmore and Sharer, Discovering Our Past, 2010 p 162)“For typical ranges of error values, hydration rate errors of 5% or less are achievable in the absence of systematic errors, with errors of chronometric age estimates are 20-30 % or less.
(Rogers 2010: 3230)“ In a series of 90 degree C isothermal laboratory hydration experiments conducted on a variety of obsidians with H2Ot concentrations up to 1.5%, it was found by Stevenson and Novak (2011) that a t0.5 diffusion rate was not always the best statistical fit to the experimental data and some water diffusion rates were t0.6 or t0.7” (Journal of Archaeological Science, Vol 40, issue 7, Stevensona, Ladefogedb and Novakc .