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While this assumption holds true in the vast majority of cases, excess argon can occasionally be trapped in the mineral when it crystallizes, causing the K-Ar age to be a few hundred thousand to a few million years older than the actual cooling age.

Secondly, K-Ar dating assumes that very little or no argon or potassium was lost from the mineral since it formed. it does not bond to any other elements), it can readily escape from minerals if they are exposed to significant amounts of heat for a prolonged period of time.

of grains between top and bottom is always proportional to the time elapsed.

In principle, the potassium-argon (K-Ar) decay system is no different.

Ar (argon), the atom typically remains trapped within the lattice because it is larger than the spaces between the other atoms in a mineral crystal.

But it can escape into the surrounding region when the right conditions are met, such as change in pressure and/or temperature.

A crucial point to note is that because K are isotopes of the same element, they have the same chemical properties.Potassium–argon 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).Though we know that K-Ar dating works and is generally quite accurate, however, the method does have several limitations.First of all, the dating technique assumes that upon cooling, potassium-bearing minerals contain a very tiny amount of argon (an amount equal to that in the atmosphere).

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