Potassium argon dating how it works single dating web site 20

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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.

While this assumption holds true in the vast majority of cases, excess argon can occasionally be trapped in the mineral when it crystallizes, causing the K-Ar age to be a few hundred thousand to a few million years older than the actual cooling age.The method relies on satisfying some important assumptions: Given careful work in the field and in the lab, these assumptions can be met.The rock sample to be dated must be chosen very carefully.K is about 1.25 billion years, which means that there is still some of the isotope remaining from the formation of the solar system.of grains between top and bottom is always proportional to the time elapsed.

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