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Figure 1: Three dimesnional plot of selected oceanic basalt data in Sr/Sr--Nd/Nd--Pb/Pb space. DMM is ``Depleted MORB Mantle.'' Adapted from Hart et al. [1992]. Figure 2. Sr/Sr vs. Pb/Pb for selected oceanic basalts. A&P MORB is Atlantic and Pacific MORB. Dark gray region in the center indicates the apparent composition of the common component, variously designated PHEM, FOZO, and ``C.''