**4.5 Zircon composition**

The analyzed zircons contain low Hf concentrations (1.1–1.7 wt.% HfO2) (**Table 3**). The proportion of the hafnium end member indicated by atomic ratio Hf/(Zr + Hf) varies from 0.010 to 0.015 (**Figure 10**). The concentration of Y in analyzed zircon is partly variable and varies from 0.01 to 0.43 wt.% Y2O3. All analyzed zircons display lower concentrations of U (0.03–0.49 wt.% UO2) and Th (0.01–0.19 wt.% ThO2).

*Investigation of Accessory Minerals from the Blatná Granodiorite Suite, Bohemian… DOI: http://dx.doi.org/10.5772/intechopen.102628*

### **Figure 4.**

*Back-scattered electron (BSE) image of allanite from the Blatná granodiorite (Aln, allanite; Ap, apatite; Bt, biotite; Kfs, K-feldspar; Pl, plagioclase; Qz, quartz).*

**Figure 5.** *BSE image of zoned apatite from the Červená granodiorite.*
