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Cathodoluminescence(CL) image of zircon grains from the Old Woman granodiorite, Mojave Desert, southeastern California. Yellow-green CL regions are magmatic overgrowths of Mesozoic age(~72 Ma), and bright and dark blue CL regions are inherited Proterozoic cores which range in age from 1.4 to 1.8 Ga(Foster et al., 1989; Miller et al., 1992). Photograph taken using Kodak Ektachrome 200 slide film. The length of the long axis of image is 770 micrometers.
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