FIG. 7. Representative cathodoluminescence (CL)-SEM images of analyzed zircon grains from host metavolcanic rock samples B18C and B18D and diabase dike samples B36A and B21D. The locations of SHRIMP analyses for dated grains are shown as circles. All ages are 207Pb/206Pb ages. Discordant data are marked with a (d). A. B18C.1-1 and B18.C1-2. B. B18C.3-1. C. B18C.6-1. D. B18D.2-1 and B18D.2-2. E. B36A.6-1. F. B36A.3-1. G. B36A.5-1. H. B21D. 6-1. I. B21D.7-1. J. B21D.2-1 and B21D.2-2.