Around the time that On the Origin of Species was published, Lord Kelvin authoritatively stated that the Earth was between 20 and million years old, a range still quoted today by many who deny evolution. Although researchers have determined the ages of rocks from other planetary bodies, the actual experiments -- like analyzing meteorites and moon rocks -- have always been done on Earth. The technique uses a few key assumptions that are not always true. To browse Academia. Argon-argon dating works because potassium decays to argon with a known decay constant.
Potassium, an alkali metal, the Earth's eighth most abundant element is common in many rocks and rock-forming minerals.
Potassium-argon datingmethod of determining the time of origin of rocks by measuring the ratio of radioactive argon to radioactive potassium in the rock. Thank you for visiting nature. In this article we shall examine the basis of the K-Ar dating method, how it works, and what can go wrong with it. The attraction of the method lies in the fact that one of the daughter elements is argon which is an inert gas. Potassium has three naturally occurring isotopes: 39 K, 40 K and 41 K.
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