Obsidian hydration dating dating a man with a wandering eye

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But, since the amount of water within obsidian can vary even within obsidian nodules from a single source, that content can significantly affect age estimates. Long published the first study, the results of an experimental hydration of obsidian from the Valles Mountains of New Mexico.Obsidian's measurable rate of rind growth has been recognized since the 1960s. Since that time, significant advancement in the recognized impacts of water vapor, temperature and glass chemistry has been undertaken, identifying and accounting for much of the variation, creating higher resolution techniques to measure the rind and define the diffusion profile, and invent and improved new models for EFH and studies on the mechanism of diffusion.But OHD is troublesome in regions like the Andes mountains of South America, where people brought their obsidian artifacts across enormous ranges in altitudes, from the sea level coastal regions to the 4,000 meters (12,000 foot) high mountains and higher.Even more difficult to account for is differential glass chemistry in obsidians.They and subsequent researchers developed distinct versions of obsidian hydration method consisting of both empirical rate and intrinsic rate development, thus refining the method.However, in spite the accurately measured rinds beyond digital optical microscopy employing infrared spectroscopy and nuclear analysis, the traditional empirical age equation produce occasionally satisfactory results but still fail to produce a reliable chronometer.

Sometimes scholars add in a depth correction factor to account for the temperature of buried artifacts, assuming the underground conditions are significantly different than surface ones--but the effects haven't been researched too much as of yet.The effects of variation in water vapor pressure in the climate where an obsidian artifact has been found have not been studied as intensively as the effects of temperature.In general, water vapor varies with elevation, so you can typically assume that water vapor is constant within a site or region.different from that of the remainder of the obsidian.The thickness of the layer can be determined by microscopic examination of a thin section of the sample cut at right angles to the surface.Prehistoric rinds can vary from less than 1 micron (µm) to more than 50 µm, depending on the length of time of exposure.

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