Argon is a noble gas. The main isotopes of argon in terrestrial systems are 40 Ar Naturally occurring 40 K decays to stable 40 Ar How far is too far in a dating relationship are dated by measurement of the concentration of potassium, and the amount of radiogenic 40 Ar that has accumulated. For example, if 40 Ar is lost by diffusion while the rock cooled, the age-dates represent the time elapsed since the rock cooled sufficiently for diffusive losses to be insignificant.
Or, if excess 40 Ar is present in the rock, the calculated age-dates are too old. Radioactive 39 Ar decays back to 39 K by beta emission with a half-life of years, but the decay is slow compared to the analysis time and can be ignored Faure, How is this calibrated. Also, even if the argon-argon dating method does eliminate the ""contamination"" problem, it does not solve the problem of original argon.
Did the clock get reset to zero when the volcano erupted. Or, was there some argon trapped in the rocks originally.
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