What is potassium argon dating used for

24 Apr

But after the rock solidifies, any potassium-40 that is present continues to decay, and the argon-40 that is produced cannot escape from the rock.Thus, geologists use potassium-argon dating to measure the age of volcanic rocks.Potassium-argon dating is a method for estimating the age of volcanic rocks by measuring the ratio of potassium-40 to argon-40 present.

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With 18 protons and 22 neutrons, the atom has become Argon-40 (Ar-40), an inert gas.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-40 (K-40) ,decays to the gas Argon as Argon-40 (Ar-40).It is based on measurement of the product of the radioactive decay of an isotope of potassium (K) into argon (Ar).Potassium is a common element found in many materials, such as micas, clay minerals, tephra, and evaporites.