JOU r.NAL OP THE COLLEGE OP ECIP.KCP, IMPEHTAL TTNIVEIISTTT, 

 TOKYO, JAPAN. 



VOL. XXXII., ARTICLE 6. 



On Nepheline-basalt from Yingé-mên, Manchuria 



By 



B. Koto, Ph. D., Rhjakithakushi 

 rrofesaor of Gi'ology, Science College, Imperial University, Tôki/ô 



With 2 Plates 



The present short paper deals with the first genuine occurrence, 

 so far as I am aware, of nepheline-basalt in the Koreo-Japanese 

 and Chinese regions. For this reason it may be of some interest 

 to petrologists, who seem at present to attach special importance to 

 any new find of feldspathoid rocks in the subalkaline circum- 

 Pacific region. 



It is the current opinion that the "Pacific region" is charact- 

 erized by the predominance of subalkaline igneous rocks in contrast 

 to the alkaline rocks of the " Atlantic region "^'*; but as there are 

 many exceptions in tlie latter, so we find alkaline rocks also in 

 the former ; and these apparently aberrant forms seem to be in- 

 creasing in number, as our petrological knowledge of their dis- 

 tribution in the " Pacific region " by degrees accumulates. 



] ) W. Cross in. his recent paper seems to discredit broad generalizations concerning the 

 genetic relations and regional distribution of igneous rocks, termed the Atlantic and Pacific 

 kindred. After closely examining the existing analyses of the Hawaiian lavas, he was forced to 

 the conclusion that " the Hawaiian magmas tend to show that the generalizations as to 

 geographic distribution or the genetic relations of the alkali and mhalkali grouj^s included in 

 current definitions of the Atlantic and Pacific branches or Si'ppen are far from correct. Hence in 

 their present form they can have no place in a pétrographie system." Whitman Cross, " The 

 Lavas of Hawaii and Their Relations." Jour. IVasliington Acad. Sei., vol. 1, Xo, 3, August, 1911. 

 How far Becke's view on the Sippe, endorsed by Harker, can withstand the criticism of age, I 

 cannot toll now. {Added while in press.) 



