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Figure F5. A. Age-corrected isotope data. Fields for Pacific mid-ocean-ridge basalt (MORB) and the Easter-Nazca Ridge hotspot chain are adjusted for radiogenic ingrowth to the estimated 144 Ma positions of the mantle sources (see Tejada et al., 2004). Pb isotope data for Holes 1213B and 1179D (and Easter-Nazca Ridge) were acquired using a double spike. Fields are from Mahoney and Spencer (1991), Tejada et al. (2004), Ray et al. (2003), and references therein (after Mahoney et al., 2005). SOTW = Southtow Expedition. B. Incompatible element diagram for Site 1213 samples compared with Ontong Java and mid-ocean-ridge basalt (MORB). Ontong Java pattern is from Fitton and Godard (2004); average normalized-MORB (N-MORB) pattern and normalizing values are from Sun and McDonough (1989) (after Mahoney et al., 2005).

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