Obsidian hydration dating archaeology

20-Sep-2019 08:54

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.In essence it is a technique with a large resolution on a plethora of chemical elements and molecular structures in an essentially non destructive manner.An approach to OHD with a completely new rationale suggests that refinement of the technique is possible in a manner which improves both its accuracy and precision and potentially expands the utility by generating reliable chronological data. presented a model which relied solely on compositionally-dependent diffusion, following numerical solutions (finite difference (FD), or finite element) elaborating on the H profile acquired by SIMS.I never needed anyone to do my homework for me until I got a part-time job in college.

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.The FD equations are based on a number of assumptions about the behavior of water as it diffused into the glass and characteristic points of the SIMS H diffusion profile.In Rhodes, Greece, under the direction and invention of Ioannis Liritzis, the dating approach is based on modeling the S-like hydrogen profile by SIMS, following Fick's diffusion law, and an understanding of the surface saturation layer (see Figure).The technician measures the microscopic amount of water absorbed on freshly broken surfaces.The principle behind obsidian hydration dating is simplethe longer the artifact surface has been exposed, the thicker the hydration band will be.

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.The FD equations are based on a number of assumptions about the behavior of water as it diffused into the glass and characteristic points of the SIMS H diffusion profile.In Rhodes, Greece, under the direction and invention of Ioannis Liritzis, the dating approach is based on modeling the S-like hydrogen profile by SIMS, following Fick's diffusion law, and an understanding of the surface saturation layer (see Figure).The technician measures the microscopic amount of water absorbed on freshly broken surfaces.The principle behind obsidian hydration dating is simplethe longer the artifact surface has been exposed, the thicker the hydration band will be.as a result of radiocarbon dating of associated materials).