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246 Handbook on the Physics and Chemistry of Rare Earths been a matter of substantial debate for over 100 years, and several fundamen- tally different modes of formation have been suggested (Jonsson et al., 2013). These include direct magmatic segregation or crystallization, magmatic– hydrothermal replacement, and hydrothermal precipitation in the sense of iron oxide–copper–gold (IOCG-type) deposits (eg, Jonsson et al., 2013). Fig. 47 shows chondrite-normalized REE pattern of apatite ores from various igneous and sedimentary apatite deposits and prospects. Apatite ores from carbonatite and nepheline syenite generally show LREE-rich patterns, while those from the Benjamin River and the Blockspruit IOA prospects show quite HREE-rich patterns (Fig. 47). In this review, we will discuss the REE potential of igneous apatite referring the case studies in Benjamin River (Canada) and Blockspruit (South Africa) FIG. 47 Chondrite-normalized REE patterns for apatite ores from the representative igneous apatite deposits and phosphorite deposits (sedimentary).PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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