Links the publications warehouse does not have links to digital versions of this publication at this time download citation as: ris | dublin core abstract additional publication details. May 2006 artifacts and features obsidian hydration dating this article is one of an occasional series discussing matters archaeological, especially with reference to the maturango museum. Obsidian hydration has certain weaknesses in terms of a chronometric tool like any other dating method at any rate, two fundamental equations involved need further experimentation or. 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.
An obsidian clovis point as compared to a obsidian blade found in sarasota, florida (1) microwear the distinction of flaking which results from deliberate retouch from that caused by wear from usage has been the source of much confusion. Recent experimental work has shown that the rate of hydration is significantly influenced by the amount of intrinsic water (0h-) contained within the unweathered obsidian a value for the intrinsic water concentration may be obtained through a nondestructive measurement of glass density, thereby. Obsidian: obsidian is an aluminosilicate, or rhyolitic, glass, formed by rapid cooling of volcanic magma under the proper geologic conditions as any other glass, it is not a crystal, and thus it. View obsidian hydration dating research papers on academiaedu for free.
One specific type of weathering done on to obsidian is called hydration, which occurs by the water within the atmosphere being absorbed by the obsidian thus increasing the water content within the rock. Obsidian hydration dating obsidian hydration datingchronological how does obsidian hydration dating work obsidian hydration dating examples methods obsidian hydration dating 10 obsidian hydration datingobsidian, or volcanic glass, is formed by the rapid cooling of silica-rich. Start studying dating techniques table learn vocabulary, terms, and more with flashcards, games, and other study tools hydration of obsidian varying hydration. Standard obsidian hydration analyses result in obtaining hydration band measurements calendar dates can be provided for those sources where chronometric control exists in order to calculate dates, we will need obsidian source information and the location of the site where the specimens were obtained.
Obsidian hydration: another dating method which has been used to date many american sites is obsidian hydration which can be used for dating sites from 200 to 100,000 years old when a piece of obsidian is chipped to make a tool, the freshly exposed surface begins to absorb water at a rate that depends on the source of the obsidian, the. Obsidian (volcanic glass) because it is easy to flake and holds a sharp edge was a widely prized material used to manufacture stone tools because freshly flaked surfaces develop a measurable hydration rind and because the depth of the rind is time dependent, many scientists have attempted to use rind thickness to determine age of tool manufacture. Looking for obsidian hydration method find out information about obsidian hydration method a chemical dating method that depends on the progressive thickening of a hydrated layer on the surface of volcanic glass explanation of obsidian hydration method. Northwest research obsidian studies laboratory report 2006-116 2 one micron often cannot be resolved by optical microscopy hydration thicknesses are reported to the.
1989 obsidian hydration rates in california in current directions in california obsidian studies, edited by richard e hughes, pp 31-58 contributions of the. This variation in obsidian flow water content, and thus hydration rate, may for example, help explain the variation in hydration rim measurements with known 19th century creation dates from a single event (origer, 1989. The limitations of obsidian hydration dating 9262014 obsidian hydration dating from anthro 2ac at university of california, berkeley.
Obsidian hydration dating range obsidian is a naturally occurring volcanic glass formed as how to relieve breast pain while pregnant an extrusive igneous obsidian hydration dating range rockobsidian is produced when breast cyst pain treatment felsic lava extruded from ahe made all. Friedman i, pierce kl, obradovich jd, long wd three different groups of hydration rinds have been measured on thin sections of obsidian from obsidian cliff, yellowstone national park, wyoming the average thickness of the thickest (oldest) group of hydration rinds is 163 micrometers and can be. Obsidian is found in the western united states, alaska, central america, and elsewhere when an archaeologist has identified the source of the obsidian from which an artifact is made, he or she may be able to date the artifact using the obsidian hydration technique. Obsidian hydration dating method obsidian hydration datingobsidian, or volcanic glass, is formed by the obsidian dating hydration dating method rapid cooling of silica-rich lavaalthough how does obsidian hydration dating work its precise varies from one outcrop.