Figure 22. Silica-alkali diagram for compositions of the volcanic rocks studied: (1) Balagan-Tas Volcano; (2) Zhokhov Island; (3) Anyui Volcano; (4) Pyatistennyi Volcano; (5) Aluchin volcanoes; (6) Bilibin Volcano; (7) Priokhot'e. The dividing lines: I, {\it Macdonald and Katsura} [1964]; II, {\it Saggerson and Williams} [1964].