Figure F46. A. MgO vs. Fe₂O₃, and B. Zr vs. Y for Site 1149 and Site 801 tholeiitic lavas. Solid (black) circles = Site 1149 basalts; open (blue) circles = Hole 801C tholeiites; and crosses (red) = data from modern East Pacific Rise (Langmuir, et al., 1986). EPR = East Pacific Ridge.