Potassium argon dating method

Potassiumargon dating, abbreviated K–Ar dating, is a radiometric dating method used in geochronology and archaeology.It is based on measurement of the product of the radioactive decay of an isotope of potassium (K) into argon (Ar).

The mineral sanidine, the high-temperature form of potassium feldspar, is the most desirable.Thus, the ratio of argon-40 and potassium-40 and radiogenic calcium-40 to potassium-40 in a mineral or rock is a measure of the age of the sample.The calcium-potassium age method is seldom used, however, because of the great abundance of nonradiogenic calcium in minerals or rocks, which masks the presence of radiogenic calcium.After the recrystallization of magma, more being the most abundant isotope.Thus, the amount of calcium originally present is not known and can vary enough to confound measurements of the small increases produced by radioactive decay.

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