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140 Handbook on the Physics and Chemistry of Rare Earths ppb 1000 100 10 La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu FIG. 4 Abundance of lanthanides in CI chondrite. After Lodders, K., Fegley, B., 1998. The Planetary Scientist’s Companion. Oxford University Press, New York. Subduction zone Oceanic island Mid-oceanic ridge Continental rift Upper mantle Lower mantle Subduction slab Continental lithosphere Oceanic lithosphere Oceanic crust FIG. 5 Major sites of magma generation. Isotopic variations (87Sr/86Sr, 143Nd/144Nd, 206Pb/204Pb) in basalt, which are the product of partial melting of the mantle, clearly show that the chemical composition of the present-day mantle is heterogeneous. Such isotopic var- iations are conspicuous among the basalts erupted at mid-oceanic ridge basalt (MORB) and those erupted on oceanic island basalts (OIB) (Fig. 5). MORB is enriched in 143Nd/144Nd and depleted in 87Sr/86Sr, while OIB are depleted Outer core Mantle plumePDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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