GEOLOGY OF THE LONG LAKE QUADRANGLE 



511 



considerably too small. The amount of zircon is probably too 

 large, and the slide does not seem to show quite the normal amount 

 of magnetite. The plagioclase is in minute grains and is difficult 

 of exact determination though it seems oligoclase. 



Chemical composition and norm of Morris granite (i5-A-3)i 



Chem. 

 comp. 



Mol. 

 ratio 



Or. 



Ab. 



An. 



Cor. 



Hy. 



Mt. 



Qz. 



• 



SiOs 



A120, . . . 



76.41 

 12.41 

 1 .01 

 0.50 

 .46 

 0.78 

 3-34 

 4-33 

 0.34 

 0.1? 



1-273 

 .122 

 .006 

 .007 

 .oil 

 .014 



■ .054 

 .046 



.276 

 . 046 



■324 

 ■054 



.028 

 . 014 



.008 



.012 



-633 



Fe^Os . . . 

 FeO 





.006 

 .006 





! 







.DOT 

 .Oil 





MsrO 



! 









CaO 



.046 



•054 



.014 









Na,0 .... 













K2O.. . . . 













H2O + ... 















H2O— . . . 

















Ti02 - 



0.0^ 

 . 02 

 '0 . 01 

 .01 

 . 06 





















Zr02 .... 



















F 



















S 



















MnO 































Total . . 



99.84 





.046 



•054 



.014 



.008 



.012 



.006 



•633 



Or.. . 

 Ab. . 

 An. . 

 Co.. . 

 Qz. . 

 Hy.. 

 Mt. . 

 Ti. . . 

 Rest. 



25-531 

 28 30 



3-89^ 

 o . 82 j 



37 -95 J 



T . 2 3 1 



T-39 [ 

 o .08 I 



0.60 



96-34 



2 . 70 



Total 90 - 84 



Class, = 



Fem. 



Order, t^ = 

 F 



Rang, 



96-34 

 = = 35.7 = T, persalane 



^ =0.6=; = 7., columbare 



57-77 ^ 



Na^O" + K2O' 100 



Subrang, 



CaO' 

 K2O' 

 Na20' 



14 



7.1 = 1 alaskase 



46 



— == .85 = 3, alaskose 



54 ^ "^ 



In the ncAv classification of igneous rocks this granite would be 

 called an alaskose. It is however very near the border between 

 orders 3 and 4, so that a comparatively slight increase in feldspar 

 at the expense of quartz would put it into the liparose division. 

 The norm differs from the mode slightly in the quartz-feldspar 

 percentages. A considerable portion of the magnetite of the norm 

 belongs in the chlorite of the mode and with this would go the 

 slight excess of alumina which appears as corundum in the norm. 

 The hypersthene, corundum, and excess of magnetite of the norm 



IE. W. Morley, analyst. P2O5, BaO and CI absent. 



