Argon isotope dating
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Any alteration or fracturing means that the potassium or the argon or both have been disturbed.
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.
That is, a fresh mineral grain has its K-Ar "clock" set at zero.
The rock sample to be dated must be chosen very carefully.
But micas, plagioclase, hornblende, clays, and other minerals can yield good data, as can whole-rock analyses.
Young rocks have low levels of The rock samples are crushed, in clean equipment, to a size that preserves whole grains of the mineral to be dated, then sieved to help concentrate these grains of the target mineral.
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If one of these protons is hit by a beta particle, it can be converted into a neutron.The key is to put the mineral sample in a neutron beam, which converts potassium-39 into argon-39.
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