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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.

Lava flows that lie above and below rock beds with ancient human fossils are a good—and true—example.Potassium–argon dating, abbreviated K–Ar dating, is a radiometric dating method used in geochronology and archaeology.It is based on measurement of the product of the radioactive decay of an isotope of potassium (K) into argon (Ar).This is approximately 2,500 times as much Ar as is found in natural muscovite.Thus under certain conditions Ar can be incorporated into minerals which are supposed to exclude Ar when they crystallize. envisage noble gases from the mantle (and the atmosphere) migrating and circulating through the crust, so there should be evidence of excess in crustal rocks and their constituent minerals could well be the norm rather than the exception.

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