Where are obsidian dating labs

Increased viscosity impedes crystallization, and the lava solidifies as a glass.Different obsidians are composed of a variety of crystalline materials.These same assumptions also apply to the 40Ar/39Ar method, although this latter technique provides greatly increased opportunities for their testing.The principal assumptions are given below with brief comment as to their validity, and will be further discussed implicitly or explicitly in the following chapters."1.Alisyd , 18 April 2006 (UTC) Standard creationist boilerplate is not appreciated and not helpful.

Obsidian is extremely rich in silica (about 65 to 80 percent), is low in water, and has a chemical composition similar to rhyolite.We must assume that there was no argon already trapped in these lattices, none escaped or was added until we found the rock and that decay rates have always been constant.No one was there to observe these things, so can we really trust their dates?Their abundant, closely spaced crystallites (microscopic embryonic crystal growths) are so numerous that the glass is opaque except on thin edges.Many samples of obsidian contain spherical clusters of radially arranged, needlelike crystals called spherulites.

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