86 



Analyses of the Acid or Granophyric Facies of the Eruptives 



— 



I 



11. 



III 



IV 



V 



SiOo 



7?. 33 



12.99 

 0.00 

 2.50 

 0.97 

 1.73 

 7.60 

 0.00 

 1.09 

 0.74 

 0.00 

 0.00 

 1.00 

 0.00 



62.54 

 14.79 

 0.00 

 8.49 

 2.08 

 1.49 

 6.27 

 1.12 

 3.51 

 0.00 

 0.00 

 0.00 



0.00 



61.93 

 13.03 

 0.56 

 8.00 

 1.76 

 4.02 

 3.18 

 2.80 

 1.95 

 0.84 

 0.32 

 0.18 



0.19 



67.76 

 14.00 

 0.00 

 5.18 

 1.00 

 4.28 

 5.2? 

 1.19 

 1.01 

 0.46 

 0.19 

 trace 



0.00 



76.03 



Al 2 0;l 



13.02 



Pe 2 0» 



1.44 



FeO 



1.29 



MgO 



0.16 



CaO 



0.15 



Na 2 



3.68 



K 2 



3.74 



H 2 



0.96 



TiOo 



0.00 



P 2 6 



MnO 



0.00 

 0.00 



COo 





s 



0.00 









100.95 



100.29 



98.76 



100.29 



100.47 



I. University mine dike, Cobalt, N. L. Bowen, analyst (Journal Can. Min. 1st., Vol XII). 

 II. Lost Lake granophyre, Gowganda Cobalt-Silver area, N. L. Bowen, analyst, 



III. Acid edge of nickel eruptive Onaping section, Sudbury, E. G. R. Ardagh, analyst. 



IV. Near acid edge of the Blezard-YVhitson lake section. Sudbury, T. L. Walker analyst. 

 V. Lorrain granite dikes, fine in grain or aplitic, Cobalt. About a dozen specimens were 



taken to get an average. 



Analysis No. V is added to the table to show the difference in composition between the 

 dikes of Lorrain granite and the acid facies of the Nipissing diabase and Sudbury norite. In 

 all the analyses of the latter the proportion of soda to potash is high while in the case of the 

 Lorrain granite dikes it is more nearly equal. 



BASIC DIKES YOUNGER THAN NIPISSING DIABASE 



In the region one hundred miles in width, between 

 Sudbury on the southwest and Quinze lake, which lies to 

 the east of the head of Lake Temiskaming, on the north- 

 east, basic dikes have been found at many points. These 

 dikes are younger than the Sudbury norite and the Nipissing 

 diabase, which, of the basic igneous rocks, immediately 

 precede them in age. 



The age relation of these dikes to those of aplite or 

 granophyre, described in a preceding paragraph, which are 

 believed to represent acidic, residual material of the 

 Nipissing diabase magma, is not known. The basic dikes 

 in all probability also came from this magma. In the 

 Sudbury area these dikes are cut by greyish, fine-grained 

 granite, the voungest intrusive of that area.* 



*14th Report, Ontario Bureau of Mines, Part III., pp. 14, 12P. 



