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REE Mineralogy and Resources Chapter 279 185 FIG. 26 Plots of chondrite-normalized REE concentration in monazite and allanite. (A) Mn-poor allanite from magnetite-series granitic rocks ((La/Sm)cn: 3.37–6.52). (B) Allanite from ilmenite- series granitic rocks ((La/Sm)cn: 0.43–2.93). (C) Monazite from magnetite-series granitic rocks ((La/Sm)cn: 2.25–7.50). (D) Monazite from ilmenite-series granitic rocks ((La/Sm)cn: 0.09–4.56). Panel A: Data from Hoshino, M., Kimata, M., Shimizu, M., Nishida, N., Fujiwara, T., 2006. Allanite-(Ce) in granitic rocks from Japan: genetic implications of patterns of REE and Mn enrich- ment. Can. Mineral. 44, 45–62. Panel B: Data from Suzuki, K., Adachi, M., Yamamoto, K., 1990. Possible effects of grain-boundary REE on the REE distribution in felsic melts derived by partial melting. Geochem. J. 24, 57–74; Hoshino, M., Kimata, M., Shimizu, M., Nishida, N., Fujiwara, T., 2006. Allanite-(Ce) in granitic rocks from Japan: genetic implications of patterns of REE and Mn enrichment. Can. Mineral. 44, 45–62; Miyawaki, R., Yokoyama, K., Matsubara, S., Tsutsumi, Y., Goto, A., 2008. Uedaite-(Ce), a new member of the epidote group with Mn at the A site, from Shodoshima, Kagawa Prefecture, Japan. Eur. J. Mineral. 20, 261–269. Panel C: Data from Hoshino, M., Watanabe, Y., Ishihara, S., 2012b. Crystal chemistry of monazite from the granitic rocks of Japan: petrogenetic implications. Can. Mineral. 50, 1331–1346. Panel D: Data from Suzuki, K., Adachi, M., Yamamoto, K., 1990. Possible effects of grain-boundary REE on the REE distribution in felsic melts derived by partial melting. Geochem. J. 24, 57–74; Hoshino, M., Watanabe, Y., Ishihara, S., 2012b. Crystal chemistry of monazite from the granitic rocks of Japan: petrogenetic implications. Can. Mineral. 50, 1331–1346. solutions among the endmembers. In order to clarify the relationship between the monazite and the host granitic rocks, Hoshino et al. (2012b) adopted the ter- nary system 2REEPO4 (monazite)–CaTh(PO4)2 (cheralite)–2ThSiO4 (huttonite) (Fig. 28). This figure shows that the cheralite component in monazite changes remarkably dependent on the kind of host rock. Monazite grains with high cher- alite components occur in highly differentiated S-type granites from intraconti- nental settings (Broska and Petr ́ık, 2008; F€orster, 1998), while the ones from the magnetite-series and ilmenite-series granitic rocks in Japanese island arc contain a relatively low cheralite component (Hoshino et al., 2012b). These results are concordant with the fact that typical S-types in Japanese granitic rocks are scarce (Chappell and White, 1974) and only one-third of the Japanese ilmenite-series granitic rocks are classified partly as S-type (Ishihara, 1981).PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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