Ar ar dating

Some of the problems of K-Ar dating can be avoided by the use of the related Ar-Ar dating method.In this article we shall explain how this method works and why it is superior to the K-Ar method.

The reader should be thoroughly familiar with the K-Ar method, as explained in the previous article, before reading any further.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.The rock sample to be dated must be chosen very carefully.Any alteration or fracturing means that the potassium or the argon or both have been disturbed.The isotopes the KAr system relies on are Potassium (K) and Argon (Ar).

Potassium, an alkali metal, the Earth's eighth most abundant element is common in many rocks and rock-forming minerals.

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

Therefore, mafic rocks and minerals often contain less potassium than an equal amount of silicic rock or mineral.

Susie Welch, recently retired outreach coordinator at the New Mexico Bureau of Geology, was recognized by Governor Susana Martinez for outstanding accomplishments and invaluable contributions to the state of New Mexico.

Congratulations to Susie on the well-deserved citation!

data on whole-rock material, though the methods are applicable to all published plateau data.