Thermochronometry most often involves the determination of a cooling age from parent and daughter abundances within an entire crystal or population of crystals (Dodson 1973). Complementary information exists in the spatial concentration distribution of the daughter, C(x,y,z), within a single crystal. By combining a bulk cooling age with C(x,y,z) on the same sample, it is possible to place tight limits on the sample’s time-temperature (t-T) path. Techniques for this kind of analysis have been developed for several different parent/daughter systems including U-Th-Pb and K-Ar (Harrison et al. 2005)....

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