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REE Mineralogy and Resources Chapter 279 141 in 143Nd/144Nd and enriched in 87Sr/86Sr, compared to the bulk silicic earth. These results show that the source for MORB is relatively depleted in incom- patible elements. This means that the source mantle of most MORB has expe- rienced depletion in incompatible elements while the source of OIB has experienced enrichment in incompatible elements, compared to the estimated composition of the primitive mantle (White, 2013). Thus, there is a clear difference in the REE composition between MORB and OIB; MORB is depleted in LREEs but OIB is enriched in them (Fig. 6). The depletion of incompatible elements including LREEs in MORB is explained by extraction of partial melts from previously depleted MORB man- tle, which have formed oceanic crust and more importantly continental crust that are enriched in incompatible elements (Saunders et al., 1988; Table 3). The enrichment of LREEs in OIB is interpreted by its smaller degree of partial melting, which is suggested by alkaline elements rich compositions 500 100 50 10 5 1 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Chondrite-normalized REE patterns of mid-oceanic ridge basalt (MORB) and oceanic island basalt (OIB) (White, 2013). OIB MORB FIG. 6 Sample/chondritePDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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