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FIG. 54 REE Mineralogy and Resources Chapter Weathered soils of ferro-actinolite rocks from surface 279 253 A B C extend over an area of at least 600 m2 and 200 m in depth. The HREE-rich ferro-actinolite rocks are strongly weathered near the surface and form a 30–50-m thick iron oxide rich soil (Fig. 54A). HREE-mineralized ores are divided into three types based on the difference of the depth: (1) weathered soil derived from ferro-actinolite rocks (surface), (2) hydrothermal altered ferro-actinolite rocks (sallow), and (3) fresh ferro-edenite rocks (deep), which suggests that they have different geochemical and mineralogical characteris- tics. The (1) weathered soil has higher REE contents (5298 ppm REEs; 2308ppm HREEs) than the nonweathered part of the rock (2 and 3) (2860 ppm REEs; 1063 ppm HREEs) (Fig. 54A–C). REE host minerals in the three types of ores are REE-rich apatite, monazite, and xenotime. We review geochemistry and mineralogy of the three types of HREE-rich ores briefly in this chapter. The HREE mineralization in surface soil derived from weathered ferro- actinolite rocks were described by Horiuchi et al. (2014) and Hoshino et al. (2015) in detail. As mentioned earlier, in the Blockspruit prospect, HREE-rich ferro-actinolite rocks intrude into granitic rocks, however these rocks are poorly exposed on the surface due to intense weathering and flat topography. Horiuchi et al. (2014) attempted to estimate the potential for HREEs in this Altered ferro-actinolite rocks from surface Fresh ferro-edenite rocks from deep zone Apatite Apatite HREE-rich weathered soils (A), ferro-actinolite (B), and ferro-edenite rocks (C) from drill holes in the Blockspruit prospect (Hoshino et al., 2015).PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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