438 V. A. Eyles and J. B. Sumpson— 
PLUTONIC ROCKS | 
Fig.V. 
Granite 
% Side 
o 90. 
| wa Fig. vi. | 
a 1 Quartz-diorite 
a and i 
} Tonalite 1 
10 e OY) 6g! Granodiorite 
Monzonite 
40 50 60 79 80 90 
Fig. Vi. i 
European Diorite 
Perc ent age 
% Si02 
90: 
Nepheline Syenite 
Syenite 
% Side 
30 40 50 60 70 80 90 | 
