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Time since recrystallization is calculated by measuring the ratio of the amount of The quickly cooled lavas that make nearly ideal samples for K–Ar dating also preserve a record of the direction and intensity of the local magnetic field as the sample cooled past the Curie temperature of iron.
The geomagnetic polarity time scale was calibrated largely using K–Ar dating.
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On the other hand, the abundance of argon in the is relatively small because of its escape to the atmosphere during processes associated with volcanism.
In these materials, the decay product Ar is able to escape the liquid (molten) rock, but starts to accumulate when the rock solidifies (recrystallizes).To obtain the content ratio of isotopes K in a rock or mineral, the amount of Ar is measured by mass spectrometry of the gases released when a rock sample is melted in vacuum.