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Potassium–argon dating, abbreviated K–Ar dating, is a radiometric dating method used in geochronology and archaeology.
Potassium occurs in two stable isotopes (Ar atoms trapped inside minerals.
What simplifies things is that potassium is a reactive metal and argon is an inert gas: Potassium is always tightly locked up in minerals whereas argon is not part of any minerals. So assuming that no air gets into a mineral grain when it first forms, it has zero argon content.
Sometimes, when a large amount of argon has been lost, this is not possible.
In these cases, the age of the first batch of argon released is the age of the reheating event, and the age of the last argon released is the minimum age of initial crystallization.
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There are several steps that one must take to obtain an argon-argon date: First, the desired mineral phase(s) must be separated from the others.Safety advice Dating is fun but to ensure you do it in the safest way possible we have put together some golden rules to help you get the most out of your online dating journey.Get dating advice and anecdotes from our very own Match bloggers on all things relationships!That is, a fresh mineral grain has its K-Ar "clock" set at zero.The method relies on satisfying some important assumptions: Given careful work in the field and in the lab, these assumptions can be met.
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