Ion microprobe analysis of zircon is now a routine technique. Combined with optical and electron imaging techniques, especially cathodoluminescence, it allows the assessment of age heterogeneity or difference between age of core and overgross.

Examples of Ahrens-Wetherill concordia plots for various types of zircons:

Example of plot for local elemental rare-earth analysis in zircons:

Example of Tera-Wasserburg plot (observed, uncorrected for common lead) for young zircons: