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208 Handbook on the Physics and Chemistry of Rare Earths Heling Granite porphyry Rhyolitic vitrophyre Rhyolitic ignimbrite 0 2 4 km Rhyolitic tuff Cretaceous sandstone Fault FIG. 38 Geologic map of the LREE-rich Heling deposits in southern China. Partly modified from Zhang, Z.H., 1990. A study on weathering crust ion adsorption type REE deposit, South China. Contrib. Geol. Miner. Resour. Res. 5, 57–71 (in Chinese with English abstract); Zhang, F.R., Ye, B.G., 1995. The lithofacies of Hululian volcanic dome, Xunwu County, Jiangxi. Geol. Jiangxi 9, 45–51 (inChinese with English abstract); Bao, Z., Zhao, Z., 2008. Geochemistry of mineralization with exchangeable REY in the weathering crusts of granitic rocks in South China. Ore Geol. Rev. 33, 519–535. 1993b). Huang et al. (1989) documented a different suite of accessory minerals of muscovite granite and biotite granite of the Zudong intrusion in Longnan. In their work, the muscovite granite underlying most of the HREE-rich ion- adsorption ore bodies contains abundant fluorite, and synchysite-(Y), and subor- dinate zircon, xenotime, monazite, gadolinite, aeschynite-(Y), pyrochlore, topaz, and columbite with lesser amounts of fergusonite, grossular, apatite, ilmenite, and magnetite (Table 13). In contrast, biotite granite of the Zudong intrusion, underlying the moderately HREE-rich ore bodies (Fig. 41B), contains zircon, xenotime, monazite, apatite, and lesser amounts of HREE-bearing minerals relative to the muscovite granite. Another good example of HREE-rich deposits is Zhaibeiding which is located in Ruyuan County, Guangdong Province. The Zhaibeiding granites consist of differentiated muscovite granite and biotite granite similar to the Longnan deposits and a U-Pb zircon age is 144.8 Ma (Ma et al., 1991; Wu et al., 1993b). These granites typically show high SiO2 contents of $76.5% and low P2O5 contents of 0.05% (Ma et al., 1991; Wu et al., 1993b) and contain accessory minerals including garnet, fergusonite, gadolinite, REE fluorocarbonates, tourmaline, fluorite, monazite, samarskite, xenotime, andPDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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