Figure F45. Total alkali content (Na2O + K2O) vs. SiO2 classification plot for basaltic lava flows from Koko Seamount. Data from Nintoku and Suiko Seamounts are shown for comparison (for data see the Fig. F18 caption in the "Site 1205" chapter). The solid diagonal line is the alkalic-tholeiitic dividing line for Hawaiian basalt. Only three Site 1206 samples plot in the alkalic basalt field.