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148 Handbook on the Physics and Chemistry of Rare Earths B Granitoids in Sanin belt A Sanin belt Sanyo belt 200 km 100 10 5 3 100 10 5 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu D Granitoids in Ryoke belt C Granitoids in Sanyo belt 100 10 5 3 LaCePrNdSmEuGdTbDyHoErTmYbLu 3 LaCePrNdSmEuGdTbDyHoErTmYbLu FIG. 12 (A) Map showing the distribution of the Sanin, Sanyo, and Ryoke belts in the south- western Japan arc and the locations of the granitoids analyzed. (B) Chondrite-normalized patterns of granitoids in the Sanin belt. (C) Chondrite-normalized REE patterns of granitoids in the Sanyo belt. (D) Chondrite-normalized REE patterns of granitoids in the Ryoke belt. Solid, gray, and open circles represent the least fractionated, averaged, and most fractionated granitoids in each belt. Data are taken from Ishihara, S., Murakami, H., 2006. Fractionated ilmenite-series granites in southwest Japan: source magna for REE-Sn-W mineralization. Resour. Geol. 56, 245–256; Ishihara, S., Wu, C., 2001. Genesis of Late Cretaceous-Paleogene granitoids with contrasting chemical trends in the Chubu district, central Japan. Bull. Geol. Surv. Jpn 52, 471–491. TiO2: 0.43 wt.%) to fractionated (SiO2 1⁄4 77.34 wt.%) parts (P2O5: 0.01 wt.%; TiO2: 0.05 wt.%) (Fig. 12B). In contrast, the ilmenite-series Ryoke granitoids show enrichment in REEs (Fig. 12D), especially HREEs in addition to the depletion of europium, although the P2O5 and TiO2 contents decrease from the less fractionated granitoids (P2O5: 0.23 wt.%; TiO2: 0.71 wt.%) to fractio- nated granitoids (P2O5: 0.02 wt.%; TiO2: 0.10 wt.%), similar to that of the magnetite-series granitoids. Titanite is stable in the oxidized felsic magma but not in the reduced magma, because in the reduced condition, ilmenite becomes stable instead of titanite (Wones, 1989). The titanite/silicate melt partition coefficients of REEs are much higher (0.3–1; Prowatke and Klemme, 2006) than those of ilmenite, and thus, REEs are incorporated into titanite in the magnetite-series granitoids. However, in the reduced magmas, REE concentration/chondrite Ryoke belt Median Tectonic LinePDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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