668 NORMAN L. BOWEN 



has been to some extent recrystallized, giving the beginning of grano- 

 phyric structure. The writer beheves that in the case of the Lily 

 Lake and Lost Lake sills the evidence points to a still more complete 

 recrystallization of fart of the adinole with the production of typical 

 granophyre. In other words, some of the adinole was essentially 

 in a state of aqueous fusion and crystallized as granophyre. The 

 melt thus formed was, to a certain extent, free to diffuse into the 

 diabase magma and gave rise to the abundant granophyric interstices 

 near the granophyre. 



If we inquire into the conditions of the formation of adinole from 

 slates, we will find that wholesale introduction of albite, as such, is 

 not necessary. Some magnesia, iron, and alumina are lost by the 

 sediment. Silica has probably not been introduced, for the loss of 

 the above-mentioned constituents suffices to increase the silica to the 

 percentage in adinole. Finally potash, too, is lost and at the same 

 time is replaced by soda.' Carbonate waters bearing a little soda 

 could accomplish the work necessary. That such waters exist in 

 basaltic magmas and have important effects during the late stages of 

 crystallization is the conclusion of Bailey and Grabham in a late 

 article.^ If the conclusions of the present writer are correct, such 

 waters, emanating from the diabase, have produced the adinole and 

 the albite-rich granophyre here described. The waters supplied 

 most of the soda and the sediment supplied alumina and silica. Cal- 

 cite is an almost universal constituent of the aplite veins associated 

 with the granophyres. It has in some cases apparently crystallized 

 together with the aplite minerals. ^ This certainly points to the 

 presence of carbonate waters. 



It has been pointed out that magnesia, iron, alumina, and potash 

 are the chief constituents carried away in the production of adinole. 

 Presumably the waters carrying these would lose their solvent power 

 at no great distance, due to fall in temperature, and they would be 

 deposited. The small patch of altered slate at a little distance from 

 the Lily Lake granophyre (see p. 665) may have been thus affected. 

 The microscope shows that the most altered parts are rich in chlorite 



1 E. Kayser, Zeit. der Deutsch. geol. GeselL, XXII (1870), 103 ff. 



2 Geol. Mag., VI (1909), 256. 



3 A. E. Barlow, Jotir. Can. Min. Inst., XI (1908), 272. 



