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REE Mineralogy and Resources Chapter 279 249 by U-Pb zircon method (Wilson and Kamo, 2008). The prospect contains apa- tite–augite–magnetite ores, gabbro-quartz–diroite and feldspar porphyry. A major lensoidal pegmatite apatite–augite–magnetite ore body, 100 m long and 10–20 m wide in size (Fig. 48), is associated with gabbro-quartz–diroite and feldspar porphyry of the complex. Apatite within the pegmatite ore body (Fig. 48) is heterogeneously distributed and apatite crystals are randomly oriented, although in places, it is concentrated in layers in which apatite crystals are oriented normal to the laying (Sinclair and Kingston, 1990). Apatite is commonly euhedral and deep pink in color, ranging in size up to a few centimeters (Fig. 49). Augite, dark green in color, is interstitial to apa- tite. Euhedral to subhedral magnetite occurs at a later pargenetic stage and magnetite veins are present in the pegmatite ore body. Relative amounts of these three minerals are variable in outcrops. Major REE minerals in Benjamin river prospect are apatite and allanite (Hoshino et al., submitted). The Mineral Liberation AnalyzerTM (MLA) results show that apatite–augite–magnetite ores contain 16–60% apatite and 0.7–1.7% allanite together with REE-rich epidote in addition to augite (31.7–75.9%) and magnetite (1.4–6.5%). REE-rich apatite in the Benjamin River prospect contains up to 5.24 wt.% REE2O3 (1.6 wt.% HREE2O3) and shows high HREE distribution (Table 16 and Fig. 50; Hoshino et al., submitted). This result is noteworthy, considering that REE contents of apatite grains from general IOA deposits (Kiirunavaara, Se-Chahun) are 9500 ppm at most and very low, especially HREEs (Table 16). Na2O in apatite from Ben- jamin River prospect, was observed for the representative other IOA deposits, FIG. 49 Photographs of apatite–augite–magnetite ores. From Hoshino, M., Watanabe, Y., Kon, Y. Contribution of apatite XE “apatite” to the crystal growth of allanite in an iron-oxide-apatite (IOA) prospect, Benjamin River, Canada. Resour. Geol. (submitted).PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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