GEOLOGY OF THE LONG LAKE QUADRANGLE 



523 



ences shown in the two analyses of the previous rock, but these 

 would affect it but slightly, and since the trouble with the previous 

 analysis may be mainly owing to the fact that the normal amount 

 of magnetite did not get into the slide, rather than because of dif- 

 ference in the composition of the hornblende, the change might not 

 be an improvement. The analysis is confidently regarded as an 

 accurate expression of the composition of the rock, which is some- 

 what more basic than the. previous one. 



As a sample of the more granitic syenite of this group a rock was 

 selected which outcrops on the road from the Litchfield gate to the 

 boathouse on Tupper lake. It is quite similar to the rock of which 

 the lodge and gate are built and it outcrops over a wide area within 

 the park where it seems to shade into the green syenite. While 

 some portions of the mass may be even more acid than this is, none 

 is greatly more so. 



Mode of red, granitic syenite (toscanose), 869 



Units 

 Units measured Sp. Or. by weight % weight 



MIcroperthite 1907x2.6 == 4958 == 67.20 



Plagioclase 281x2.63 == 739 = 10.01 



Quartz 452x2.65 == 1198 = 16.24 



Hornblende 107 x 3 . 2 = 342 = 4-63 



Magnetite 21x5.25 = no = T.49 



Biotite 3x3.0 = 9 = 0.12 



Apatite 6x3.2 = 19 = 0.25 



Zircon 1x4.5 = 4= 0.05 



Total 2778 7379 99-99 



Composition and norm calculated from mode 





Qz. 



Orth. 



Alb. 



Anor. 



Horn. 



Biot. 



Mag. 



Apat. 



Zir. 



Total 



SiOs 



A1203 



16.24 2 T . A*? 



24 . 26 

 6.86 



3.82 

 3-25 



2 . 29 



0.34 

 0.23 



0-51 

 0.63 



0-S7 

 .04 

 .02 



0.05 

 .02 

 .01 

 0.02 

 .01 







.02 



68.15 



16-53 

 1.26 





6.06 







Peo03 





I .02 

 0.47 







FeO 











1 . 00 



MgO 















0.64 

 2.48 

 4.22 



CaO 









1.78 





0. 13 





Na,0 







4.18 







K,0 





5.56 



.01 









5-59 

 . 10 



P,Os 







0. 10 

 0.02 



0.03 



F 

















. 02 



ZrO. 

















0.03 



Total.. . 

















16.24 33.09 



35-3° 



8.85 



4-63 



0.12 



1.49 



0.25 0.05 



100 .02 



