Dating in ir
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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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, 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.
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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.
The fading corrected IR ages are consistent with quartz ages for two sandy soil samples but overestimate those for six sand samples.
The overestimation of the feldspar ages is derived from the residual signal which has not been bleached before burial.
Luminescence dating refers to a group of methods of determining how long ago mineral grains were last exposed to sunlight or sufficient heating.
It is useful to geologists and archaeologists who want to know when such an event occurred.