HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS

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HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS ( handbook-onphysics-and-chemistry-rare-earths )

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REE Mineralogy and Resources Chapter 279 247 FIG. 47—Cont’d both of which are HREE-rich IOA prospects. Then the REE potential of sedimentary apatite will be mentioned. Recently, HREE-bearing apatite in deep-sea mud (unsolidified marine sediments) has attracted considerable attention (eg, Kon et al., 2014; Nakamura et al., 2015; Yasukawa et al., 2014). In addition, Emsbo et al. (2015) reported that HREE-bearing apatite in sedimentary apatite deposits (phosphorites) has large potential as a REE resource. We will briefly introduce their and others results concerning such sedimentary apatite in both deep-sea mud and sedimentary apatite deposits. 4.3.2.1 HREE-Rich Apatite Prospects and Deposits: Benjamin River HREE-Rich IOA Prospect, Canada The Benjamin River IOA prospect is hosted by a gabbro-granite plutonic complex approximately 50 km northwest of Bathurst, New Brunswick in Canada. The prospect area is underlain mainly by Silurian volcanic rocks of the Chaleur Group which are intruded by small gabbro-granite plutonic com- plexes (Fig. 48). The Chaleur Group in the prospect area is composed of sub- aerial mafic volcanic rocks of the Bryant Point Formation and felsic volcanic rocks of the Benjamin Formation, in which rhyolite is dated as 420.8 0.4 Ma

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