Potassium argon dating method

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Potassium-Argon Dating Methods

See all related overviews in Oxford Reference ». An absolute dating technique similar to radiocarbon dating but applicable to much older deposits. It is used to determine the age of volcanic rock strata containing or sealing archaeological objects rather than to date the artefacts themselves. In volcanic rocks any argon present will have escaped when the rock was last molten but will start to accumulate again when it solidifies. Thus by carefully measuring the amount of 40 K and 40 Ar present in a sample it is possible to work out how long ago it was that the rock solidified.

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Potassium-Argon Dating Potassium-Argon dating is the only viable technique for dating very old archaeological materials. Geologists have used this method to date rocks as much as 4 billion years old. It is based on the fact that some of the radioactive isotope of Potassium, Potassium K ,decays to the gas Argon as Argon Ar By comparing the proportion of K to Ar in a sample of volcanic rock, and knowing the decay rate of K, the date that the rock formed can be determined. How Does the Reaction Work?

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Argon-argon dating

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