Figure F44. TiO2 vs. (A) loss on ignition (LOI), (B) CaO/Al2O3, (C) Cr, (D) Mg#, and (E) Zr/Y. Major element values normalized to 100 wt% totals. Mg# = 100 × [Mg2+/(Mg2+ + Fe2+)], assuming that Fe2O3/FeO = 0.15. Data for ODP Leg 191 Site 1179 and Leg 198 Site 1213 from Mahoney et al. (2005). OJP = Ontong Java Plateau (data of Tejada et al., 1996, 2002; Fitton and Godard, 2004), EPR = East Pacific Rise (data of Sinton et al., 1991; Bach et al., 1994; Mahoney et al., 1994), Nazca-ESC = Nazca Ridge and Easter seamount chain (Ray et al., unpubl. data). The Nazca Ridge and Easter seamount chain together form the hotspot trail of the Easter–Salas hotspot.
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