Obsidian hydration dating on the south coast of peru dating websites for no registration

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Pure obsidian is usually dark in appearance, though the color varies depending on the presence of impurities.

Iron and other transition elements may give the obsidian a dark brown to black color. In some stones, the inclusion of small, white, radially clustered crystals of cristobalite in the black glass produce a blotchy or snowflake pattern (snowflake obsidian).

as a result of radiocarbon dating of associated materials).

Their initial work focused on obsidians from archaeological sites in western North America.

Guided by modern miners of the region the authors track down pre-Inca mining sites in the Southern Nasca Region of Peru.

In the hinterlands away from both modern and ancient roads they find a surprising number of small sites serving the...

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

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.

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To measure the hydration band, a small slice of material is typically cut from an artifact.

This breakdown of obsidian is accelerated by the presence of water.

Having a low water content when newly formed, typically less than 1% water by weight, obsidian becomes progressively hydrated when exposed to groundwater, forming perlite.

Although there are problems with small sample sizes, and readings must be adjusted for elevation, a very strong relationship accounting for nearly 90% of the total variation in the data set is found.

This suggests that obsidian hydration dating (OHD) works in the SNR and is a viable means of independently estimating age.

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