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REE Mineralogy and Resources Chapter 279 251 FIG. 51 Electron backscatter images of apatite grains from apatite–augite–magnetite ores (A–C) euhedral apatite consist of dark, bright, and porous zones. Porous zone of apatite always accompany allanite. (D) Close up of white square in (C). Porous zone have allanite and magnetite inclusions. Abbreviations: B-Ap: bright zone of apatite, D-Ap: dark zone of apatite, P-Ap: porous zone of apatite, Aug: augite, Mag; magnetite, Aln: allanite, Ep: epidote, Ab: albite, Qz: quartz. 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). 4.3.2.2 HREE-Rich Apatite Prospects and Deposits: The Blockspruit HREE-Rich IOA Prospect, South Africa The Blockspruit IOA prospect consists of ferro-actinolite intrusive rocks emplaced into the Kenkelbos-type granite of Proterozoic age, Bushveld complex (Fig. 52), (zircon age of Kenkelbos-type granite 2055.32 0.34 Ma (MSWD1⁄42, n1⁄46)) (Fig. 52). Many fluorite deposits occur in this prospect, which exist as either narrow vertical north-west striking pegmatitic veins or nearly horizontal large sheets. The largest horizontal sheets are the Ysterkop North and South bodies, which measure 1500 and 1000 m2 in area, respec- tively, and have been proved by drilling to be in excess of 30 m thick (Crocker et al., 1988). The Ysterkop North and South bodies contain charac- teristic black boulders of hematite rocks, although these rocks are poorly exposed on surface due to intense weathering and flat topography. The hema- titized rocks consist of pegmatitic quartz, fluorite, and ferro-actinolite more or less completely replaced by hematite. HREE-rich ferro-actinolite rocks crop- ping out are composed of dark green to black ferro-actinolite with pinkishPDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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