106 R. A. DALY ORIGIN OF THE ALKALINE ROCKS 



Table showing Field Associations of Alkaline and Subalkaline Eruptives—Contmued. 



Region. 



Alkaline eruptives. 



Associated subalka- 

 line eruptives. 



Carbonate rocks cut by 

 alkaline eruptives. 



Madagascar. 



Nephelite syenite, 

 nephelite basalt, 

 phonolite, trach- 

 yte, limburgite, 

 camptonite, meli- 

 lite basalt, laurvik- 

 ite, monzonite, 

 augitite, essexite. 



Diabase, feldspar 

 basalt, gabbro. 



Jurassic limestones 

 and marls. (Older 

 limestones ?) 



Trinidad, South 

 Atlantic. 



Phonolite, nephel- 

 inite, limburgite. 





? Coral reefs ? 



Heard. 



Nephelite basalt, 

 limburgite. 



Feldspar basalt. 



? 



Kerguelen. 



Phonolite, trachyte, 

 limburgite. 



Feldspar basalt. 



? (Roth found dolo- 

 mite here.) 



Nightingale. 



Phonolite. 



Andesite. 



? 



Fernando Noron- 

 ha. 



Phonolite. 



Feldspar basalt. 



? 



Cabo Frio (Brazil). 



Foyaite, pulaskite, 

 essexite, tinguaite, 

 monchi quite. 





? 



Saint Helena. 



Phonolite. 



Feldspar basalt, 

 olivine basalt. 



? 



Ascension. 



Alkaline trachyte. 



Ditto. 



? 



Sao Thome. 



Phonolite, trachyte 



Feldspar basalt, 

 andesite. 



? 



Los Islands (Af- 

 rica). 



Nephelite syenite. 





? 



