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The isotope ratios are measured and plotted as isochrons (like Rb/Sr isochrons, above). The dates from the three isochrons should be concordant, in theory, if the assumptions hold. But they are almost always discordant, indicating that the assumptions of homogenization of daughter isotopes followed by no migration of parent or daughter products are incorrect.


Ó 2010 Arthur V. Chadwick, Ph.D.