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R. A. DALY PETROGRAPHY OF THE PACIFIC ISLANDS 



Class 



7. Representing 

 magmas. 



"alkaline" 



8. Quartzose rocks. 



9. Residual types. 



Names given by authors Number of islands 



Limburgite (subalkaline ?) 6 



Theralite '. 1 



Tephrite 1 



Monzonite 1 



Nephelite syenite 1 



Foyaite 1 



Nephelite monzonite 1 



Syenite (in part ?) 6 



Trachyte 9 



Soda trachyte 6 



Phonolite 6 



Nephelinite 1 



Trachyandesite 1 



Syenite porphyry 1 



Tinguaite 1 



Camptonite 1 



Granite 12 



Rhyolite or liparite 5 



Quartz f elsite 1 



Quartz porphyry 4 



Quartz diorite 5 



Quartz andesite 2 



Dacite 3 



Hornblende basalt 1 



Hornblende gabbro 1 



Bronzite basalt 1 



Hornblende-mica andesite 2 



Augite-biotite andesite 2 



Trap-granulite 1 



Kauaiite 1 



Pyroxenite 1 



Augitite 1 



11 



64 



32 



