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Zircon trace element data for the Cézarenque–Joyeuse gneisses. (a,b,c,d) Rare Earth Elements patterns normalized to the chondrite values of Boynton (1984); (e,f) LREE contents (Ce + Nd) vs. Th/U diagram for the different date populations; (g,h) Eu/Eu* vs. Ce/Ce* diagram. The background yellow shading mimics the contours of the distribution of 209 zircon analyses from S-type granites which whole-rock compositions are not ferrosilicic (data from Wang et al., 2012: Gao et al., 2016: Burnham and Berry, 2017), drawn using the kde2d function of R (Venables and Ripley, 2002). For sake of consistency, Ce/Ce* of the literature zircon were recalculated using the same methodology as for the Cézarenque–Joyeuse gneisses, i.e., following the approach of Loader et al. (2017). Were also plotted the relationships between zircon Eu and Ce anomalies and melt temperature–oxygen fugacity, as estimated by Trail et al. (2012) for peraluminous melt compositions. The oxygen fugacity (fO2) in this plot is expressed relative to the NNO (nickel–nickel oxide) buffer. At 800 °C, the fO2 of the quartz–fayalite–magnetite (QFM) buffer corresponds to NNO-0.8 and that of the iron–wüstite buffer is NNO-5.
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