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210 Handbook on the Physics and Chemistry of Rare Earths 900 800 700 600 500 400 300 200 100 900 800 700 600 500 400 300 200 100 500 400 300 200 100 100 10 1 60 50 40 30 20 10 8 12 0.3 4 0.1 2 2 65 70 75 80 65 70 75 80 A 7 6 5 46 3 1 Low-K (Tholellitic) SiO2 (%) SiO2 (%) 65 70 75 80 SiO2 (%) SiO2 (%) Zudong muscovite granite (Longnan) Zudong biotite granite (Longnan) Guanxi biotite granite (Longnan) Muscovite granite (Datian) Biotite granite (Datian) (Biotite-)muscovite granite (Zhaibeiding) Biotite granite porphyry (Heling) Rhyolite (Heling) Biotite granite (Dingnan) Biotite granodiorite (Dajishan) Biotite granite (Laishi) Biotite granite porphyry (Renju) Biotite granite (Renju) Biotite granite (Huashan) Biotite granite (Guposhan) 0.1 65 70 75 80 SiO2 (%) B Alkali granite Granite Granodiorite 10 8 0.2 000 C SiO2 (%) SiO2 (%) 65 70 75 80 SiO2 (%) D E 000 65 70 75 80 65 70 75 80 65 70 75 80 FIG. 40 Plots of (A) K2O contents (Rickwood, 1989), (B) Na2O+K2O contents (Cox et al., 1979; Miyashiro, 1978; Wilson, 1989), (C) P2O5 contents, (D) LREE contents, (E) HREE con- tents, (F) REE contents, (G) LaN/YbN ratios, and (H) Y/Ho ratios vs SiO2 contents of parent rocks of ion-adsorption deposits in southern China (Bao and Zhao, 2008; Chen and Yu, 1994; Deng, 1988; Hua et al., 2007; Huang, 1989; Huang et al., 1989; Ishihara et al., 2008; Wu et al., 1990, 1993b; Yang et al., 1981; Yuan et al., 1993; Zhang, 1990). Subscript N represents normali- zation by chondrite values (Sun and McDonough, 1989). The typical HREE-rich deposits are indicated by colored areas. These studies indicate that the parent granites underlying the HREE-rich deposits are confined to strongly differentiated muscovite–biotite granites and muscovite granites characterized by high SiO2 contents over $75% and very low P2O5 contents of ≲0.02% (Bao and Zhao, 2008; Deng, 1988; Huang et al., 1989; Ma et al., 1991; Sanematsu and Watanabe, 2016; Wu et al., 1992, 1993b; Yang and Xiao, 2011; Yang et al., 1981; Zhang, 1990). Alkali feldspars (albite and K-feldspar) and fine-grained hydrothermal miner- als including fluorite and REE fluorocarbonates commonly occur in these granites. The significant enrichment of HREE by magmatic differentiation was also recognized in some I-type granites (Chappell and White, 1974) of high SiO2 ≳ 75% in the Lachlan Fold Belt of southeastern Australia F LREE-enriched and/or G HREE-depleted HREE-enriched and/or LREE-depleted H Shoshonitic High-K (Calc-alkaline) Midium-K (Calc-alkaline) LaN/YbN REE (ppm) K2O (%) Y/Ho LREE (ppm) Na2O+K2O (%) HREE (ppm) P2O5 (%)PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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