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252 Handbook on the Physics and Chemistry of Rare Earths FIG. 52 Locality map of the study area (A). Geological map of the Blockspruit IOA prospect (B). The red broken line around the Ysterkop North is the outer limit of the ore body determined by Crocker et al. (2001). Dense-colored areas in the center represent occurrence area of silicified and hematitized actinolite rock of the Ysterkop North bodies observed by Horiuchi et al. (2014). Panel B: Modified from Crocker, I.T., Eales, H.V., Ehlers, D.L., 2001. The fluorite, cassiterite and sulphide deposits associated with the acid rocks of the Bushveld Complex. Memoir 90, Council for Geoscience, Pretoria, South Africa, p. 115. FIG. 53 Hand specimen of HREE-rich ferro-actinolite rock in outcroup and X-ray mapping by SEM-EDS of apatite containing xenotime and monazite inclusions in ferro-actinolite rocks from surface. Modified from Hoshino, M. Moritz, R., Ovtcharova, M., Watanabe, Y., Spangenberg, J., Putlitz, B., 2015. REE mineralization of the Blockspruit fluorite prospect, Bushveld granitic com- plex, South Africa: geochemical, mineralogical and fluid inclusion studies. In: Proceedings of the 13th Biennial SGA Meeting, “Mineral Resources in a Sustainable World”, 2015, 2, 1513–1516. brown intergranular apatite crystals which are commonly replaced by hydro- thermal xenotime and monazite (Fig. 53). Hoshino et al. (2015) sampled 9 drill holes, reaching a depth of 200 m below surface, at the Blockspruit pros- pect (Fig. 52) in order to understand spatial distribution of HREEs in ferro- actinolite rocks. The results of the drilling project in the area show that the HREE-rich ferro-actinolite rocks intruding into the Kenkelbos-type granitePDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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