Figure F41. Total alkali content (Na2O + K2O) vs. SiO2 classification plot for basaltic lava flows from Koko Seamount. Shown for comparison in this and subsequent figures are data from Nintoku and Suiko Seamounts (for data see "Physical Volcanology and Igneous Petrology" in the "Site 1205" chapter) (Jackson et al., 1980; M. Regelous et al., unpubl. data). The solid diagonal line is the alkalic-tholeiitic dividing line for Hawaiian basalt (Macdonald and Katsura, 1964). Only three samples from Site 1206 plot in the alkalic basalt field, a sample from Unit 4 and the samples from Units 8 and 18.

Figure F41. Total alkali content (Na₂O + K₂O) vs. SiO₂ classification plot for basaltic lava flows from Koko Seamount. Shown for comparison in this and subsequent figures are data from Nintoku and Suiko Seamounts (for data see "Physical Volcanology and Igneous Petrology" in the "Site 1205" chapter) (Jackson et al., 1980; M. Regelous et al., unpubl. data). The solid diagonal line is the alkalic-tholeiitic dividing line for Hawaiian basalt (Macdonald and Katsura, 1964). Only three samples from Site 1206 plot in the alkalic basalt field, a sample from Unit 4 and the samples from Units 8 and 18.