Obsidian hydration dating on the south coast of peru dating assessment tool

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).

The use of Secondary ion mass spectrometry (SIMS) in the measurement of obsidian hydration dating was introduced by two independent research teams in 2002.

This sample is ground down to about 30 micrometers thick and mounted on a petrographic slide.

Obsidian hydration dating (or OHD) is a scientific dating technique, which uses the understanding of the geochemical nature of the volcanic glass (a silicate) called obsidian to provide both relative and absolute dates on artifacts.

Obsidian outcrops all over the world, and was preferentially used by stone tool makers because it is very easy to work with, it is very sharp when broken, and it comes in a variety of vivid colors, black, orange, red, green and clear.

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) a high-power microscope with 40-80 power magnification b) depth profiling with SIMS secondary ion mass spectrometry.

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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.Residual values from our regression suggest that hydration age estimates are usually within 15% of the radiocarbon estimates.Finally, we present an equation other scholars can use to estimate age for Quispisisa obsidian in the SNR. 1-450) society is explored by evaluating the use of polychrome pottery within the context of a residential village.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.The inhibition of atomic diffusion through this highly viscous and polymerized lava explains the lack of crystal growth.

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