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REE Mineralogy and Resources Chapter 279 207 Zudong intrusion Guanxi intrusion 0 2 km FIG. 37 LEGEND Zudong biotite granite Zudong muscovite granite Zudong fine-grained muscovite granite Guanxi Bt granite Granophyre Bankeng granite Lower Jurassic volcanic rocks Lower Triassic clastic rocks Permian coal measures Sinian-Cambrian metarmophic rocks Hornfels Pegmatite vein Drill hole Geologic map of the HREE-rich Longnan deposits in southern China. Partly modified from Huang, D.H., Wu, C.G., Han, J.Z., 1989. REE geochemistry and mineralization characteris- tics of the Zudong and Guanxi Granites, Jiangxi Province. Acta Geol. Sin. 2, 139–157. The HREE-rich Longnan deposits, located in Longnan County in Jiangxi Province, are underlain by the Zudong and Guangxi granite intrusions (Fig. 37). The Zudong intrusion consists of the main body of muscovite granite underlying the HREE-rich ion-adsorption ore body (Fig. 41A), whereas the Guanxi intrusion consists mainly of biotite granite underlying another ore body (Fig. 41C; Huang et al., 1989). A zircon U-Pb age and whole-rock Rb-Sr age of the Zudong intrusion give 124 and 148 Ma, respectively, and those of the Guanxi intrusion give 170 and 176 Ma, respectively (Huang et al., 1989). A recent study reported 168 Ma as a zircon U-Pb age of the Zudong muscovite granite (Zhao et al., 2014). These biotite and muscovite granites mostly show high SiO2 contents of 72–76%, low P2O5 contents of <0.06% and ASI below $1.1 (Bao and Zhao, 2008; Wu et al., 1990; Yang et al., 1981; Zhang, 1990; Fig. 40). Previous works reported that REE contents of the Zudong muscovite granite range from 195 to 342 ppm and those of biotite granite range from 150 to 288 ppm (Bao and Zhao, 2008; Huang et al., 1989; Wu et al., 1990,PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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