The geologist simply measures the relative amounts of potassium-40 and argon-40 to date the rock.However, there are often instances of small amounts of argon remaining in the rock when it hardens, due either to trapped atmospheric argon or from argon escaping from decays deep underground. But the argon from underground can have a higher concentration of argon-40 escaping from the melting of older rocks."For more than three decades potassium-argon (K-Ar) and argon-argon (Ar-Ar) dating of rocks has been crucial in underpinning the billions of years for Earth history claimed by evolutionists. Lassen plagioclase, California (AD 1915) 0.11±0.03 Ma Sunset Crater basalt, Arizona (AD 1064-1065) 0.27±0.09 Ma; 0.25±0.15 Ma Akka Water Fall flow, Hawaii (Pleistocene) 32.3±7.2 Ma Kilauea Iki basalt, Hawaii (AD 1959) 8.5±6.8 Ma Mt.In conclusion, the fact that all the primordial argon has not been released yet from the earth's deep interior is consistent with a young Earth.
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Further confirmation comes from diamonds, which form in the mantle and are carried by explosive volcanism into the upper crust and to the surface. obtained a K-Ar isochron "age" of 6.0±0.3 Ga for 10 Zaire diamonds, it was obvious excess was inherited from the mantle source areas of the magmas.
This is not only true for recent and young volcanics, but for ancient volcanics such as the Middle Proterozoic Cardenas Basalt of eastern Grand Canyon.
There are certain kinds of atoms in nature that are unstable and spontaneously change (decay) into other kinds of atoms.
For example, uranium will radioactively decay through a series of steps until it becomes the stable element lead. The original element is referred to as the parent element (in these cases uranium and potassium), and the end result is called the daughter element (lead and argon).
It is useless for dating anything older than about 50,000 years.