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Potassium–argon dating. An absolute dating method based on the natural radioactive decay of 40K to 40Ar used to determine the ages of rocks. This entry is not an exhaustive treatment of the Ar–Ar dating method, but provides a general view of the method and gives examples of its application to.
This method is based on the occurrence of the radioactive ar ar dating method 40K of potassium in rocks. This isotope decays to 40Ca and 40Ar, the last of which is used for K-Ar age dating as it accumulates in the rock over time.
The ideal model conditions may not be met due to the presence of inherited argon, loss of radiogenic argon and deformation and recrystallization of the mineral Dodson, The actual accumulation of 40Ar in a crystal structure depends not only on the time involved, but also on diffusion behavior, the temperatures the rock has experienced since its formation, cooling rate, grain size and deformation state of the crystal McDougall and Harrison, For the application of this method to age dating method it is essential to define a closure temperature.
In the laser probe analysis method, the sample is placed in an ultrahigh vacuum system and the argon is extracted from the sample by heating with a diffuse laser beam.