Obsidian hydration dating on the south coast of peru 100 free fuck dating


22-Oct-2016 09:35

obsidian hydration dating on the south coast of peru-8

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Obsidian is a volcanic glass that was sometimes used as raw material for the manufacture of stone tools such as projectile points, knives, or other cutting tools through the process of flintknapping.

Obsidian is too brittle to be used as a pounding (e.g., axe, adze) or grinding tool.

Obsidian rocks were used by early peoples for the making of their tools and implements.

Obsidian hydration dating (OHD) is a geochemical method of determining age in either absolute or relative terms of an artifact made of obsidian.

For more detail on our preliminary work, see our recent article in high grassland) ecological zone. Pontificia Universidad Católica del Perú Fondo Editorial, Lima. 2007 Late Paracas Obsidian Tools from Animas Altas, Peru. Andean Past 3-223 Burger, Richard L., Frank Asaro, Paul Trawick and Fred Stross 1998 The Alca Obsidian Source: The origin of raw material for Cuzco Type obsidian artifacts.

Following published descriptions of the first geo-archaeological prospection of the source area (Burger and Glascock 2000, 2002), we conducted multiple brief visits to the Quispisisa source area in order to collect geological samples of obsidian, explore any associated archaeological features, and conduct archaeological prospection in the surrounding area.

Experimental and empirical data indicate that this hydration band grows roughly as the square root of time (measured in years).

Thus, the hydration rind initially grows quickly, then slows with age.

obsidian hydration dating on the south coast of peru-89

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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).A small number of radiocarbon dates allow us to develop a preliminary hydration rate for Chivay obsidian in this high elevation location.



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