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Potassium-argon or K-Ar dating is a geochronological method used in many geoscience disciplines.

It is based on measuring the products of the radioactive decay of potassium (K), which is a common element found in materials such as micas, clay minerals, tephra and evaporites.

The quantity of potassium in a rock or mineral is variable proportional to the amount of silica present.

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The sample is then degassed in a high-vacuum mass spectrometer via a laser or resistance furnace.

Potassium is a common element found in many materials, such as micas, clay minerals, tephra, and evaporites.

These factors introduce error limits on the upper and lower bounds of dating, so that final determination of age is reliant on the environmental factors during formation, melting, and exposure to decreased pressure and/or open-air.

I illustrate the use of the techniques by looking at published age data for hotspot tracks in the Atlantic Ocean (the Walvis Ridge), as well as newly published ages for the British Tertiary Igneous Province.dating laboratories has led to a large number of papers reporting age data.

In the previous article I introduced you to K is a stable isotope of potassium, which by definition means that it will not spontaneously undergo decay into another isotope.