Argon 39 argon 40 dating

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The potassium-argon (K-Ar) isotopic dating method is especially useful for determining the age of lavas.

Other uses incude non-reactive blanket in the manufacture of titanium and other reactive elements and as a protective atmosphere for growing silicon and germanium crystals.However, in all cases studied, the rocks show ages considerably younger than the country rock surrounding them.Among spectral shapes identified in the study are classical plateau spectra, structured plateaus, dual plateau spectra, stepwise rising spectra, humped-shaped spectra, and saddle-shaped spectra.World production exceeds 750.000 tonnes per year, the supply is virtually inexhaustible.Argon does not react with the filament in a lightbulb even under high temperatures, so is used in lighting and in other cases where diatomic nitrogen is an unsuitable (semi-)inert gas.

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