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    Obsidian hydration dating on the south coast of peru dating recently separated man kids

    It is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth.

    Obsidian is commonly found within the margins of rhyolitic lava flows known as obsidian flows, where the chemical composition (high silica content) induces a high viscosity and polymerization degree of the lava.

    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).

    more 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 pre-Inca industry, principally in the Nasca period.

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

    Obsidian obeys the property of mineral hydration, and absorbs water when exposed to air.

    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.

    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 b) depth profiling with SIMS secondary ion mass spectrometry), and IR-PAS (infra red photoacoustic spectroscopy).

    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 b) depth profiling with SIMS (secondary ion mass spectrometry), and IR-PAS (infra red photoacoustic spectroscopy).

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