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Potassium is chemically incorporated into common minerals, notably hornblende, biotite and potassium feldspar, which are component minerals of igneous rocks.

Argon, on the other hand, is an inert gas; it cannot combine chemically with anything.

If one of these protons is hit by a beta particle, it can be converted into a neutron.

With 18 protons and 22 neutrons, the atom has become Argon-40 (Ar-40), an inert gas.

However, in a metamorphic rock that has not exceeded its closure temperature the age likely dates the crystallization of the mineral.

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(However, see the section below on the limitations of the method.) This suggests an obvious method of dating igneous rocks.

If we are right in thinking that there was no argon in the rock originally, then all the argon in it now must have been produced by the decay of Ar in them will be so small that it is below the ability of our instruments to measure, and a rock formed yesterday will look no different from a rock formed fifty thousand years ago.

The severity of this problem decreases as the accuracy of our instruments increases.

The older method required splitting samples into two for separate potassium and argon measurements, while the newer method requires only one rock fragment or mineral grain and uses a single measurement of argon isotopes. The sample is then degassed in a high-vacuum mass spectrometer via a laser or resistance furnace.

Heating causes the crystal structure of the mineral (or minerals) to degrade, and, as the sample melts, trapped gases are released.

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