potassium-argon dating in English
noun
1
a method of dating rocks from the relative proportions of radioactive potassium-40 and its decay product, argon-40.
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1. Biotite is used readily to determine ages of rocks by either potassium-argon dating or argon-argon dating, because argon escapes from the Biotite crystal structure with ease at higher temperatures, so using it to date this way may only give the minimum ages for a lot of rocks.