Figure F12. Total alkali (Na2O + K2O) vs. silica (SiO2) (after Le Bas et al., 1986), Hole U1415N. For comparison, basalt sampled along the East Pacific Rise (EPR) (www.earthchem.org/petdb/; 22 December 2012) during Ocean Drilling Program Leg 147 (Allan et al., 1996) and in Hole U1415J are shown. For the analyzed samples, total alkali was calculated by neglecting the K2O content because K2O content is very low (<0.04 wt%).
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