Argon 39 argon 40 dating

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Illite crystallization ages from the NPRA (National Petroleum Reserve in Alaska) range between 205 and 225 Ma.Devonian shales from south of the thrust yield relatively flat age spectra indicative of a younger illitic component, and argon retention ages around 225 Ma.Shale samples from north of the thrust yield staircase age spectra indicative of a detrital illite component, and older retention ages (233-391 Ma).At the time, Cavendish was unable to identify what it was. A century later, argon was identified in 1894 by British scientists, Lord Rayleigh and William Ramsay.It was discovered by separating it from liquid air.The step heating method is effective in differentiating between, and dating neoformed and detrital illite components.

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