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When a reasonable number of consecutive steps, carrying a substantial amount of the total argon released, give the same age, the resulting average value carries geological significance.For unmetamorphosed igneous rocks, the latter would normally represent the crystallization age.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 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.

Because it is present within the atmosphere, every rock and mineral will have some quantity of Argon.However, in many instances, the published “ages” have no merit, as they fail the simple statistical tests that should be applied to all such data. In these experiments, a sample is heated in steps of increasing laboratory extraction temperature, until all the argon is released.The argon released in each step is measured to calculate a “step age” with an associated analytical error.The site also must be geologically meaningful, clearly related to fossil-bearing rocks or other features that need a good date to join the big story.Lava flows that lie above and below rock beds with ancient human fossils are a good—and true—example.




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