Figure F12. Total alkalis vs. silica, with classification of volcanic rock types of Le Maitre et al. (1989). The dashed blue line divides data between tholeiitic and alkalic lavas of Hawaii (Macdonald and Katsura, 1964; Macdonald, 1968). Shown for comparison are data for Indian Ocean mid-ocean-ridge basalt (MORB) from the Geochemical Rock Database (georoc.mpch-mainz.gwdg.de/), the seamount in the South China Sea (Tu et al., 1992; Hékinian et al., 1989), ocean island basalt of Hainan Island (Wang et al., 2012), and Pacific MORB (Zhang et al., 2009, 2012a, 2012b, 2013).
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