Age correcting isotopic data is a method to "see through" recent changes in a sample's isotopic ratios. This is done by calculating the amount of decay that has occured since the was emplaced by using the parent/daughter ratio of the sample and its age. This method is commonly used to determine the source of a sample and if that source is common among a set of samples. Put another way: age correction corrects for the dispersion in isotopic ratios that occurs from in-situ decay of variably fractionated parent/daughter ratios during igneous processes.
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