﻿i/-6 



NEW YORK STATE MUSEUM 



somewhat atoning for this neglect, analyses have been prepared of 

 four samples of granites of the region, as shown in the following 

 table : 



Si0 2 . . 

 A1 2 3 . 

 Fe 2 3 . 

 FeO. . 

 MgO.. 

 CaO. . 

 Na 2 0. 

 K 2 0. . 

 H 2 + 

 H 2 0— 

 Ti0 2 . . 

 Zr0 2 .. 

 P2O5.. 



CI 



F 



S 



MnO.. 

 BaO.. 



76.56 



12.95 



.16 



•37 



.24 



1.30 



3-9° 

 4-23 



•25 



.06 



04 



°3 

 02 

 02 

 02 



100.15 



76.41 



12 .41 



1 .01 



•5o 



.46 



•78 



3-34 



4-33 



-34 



•13 



•03 



.02 



,01 

 ,01 

 ,06 



99.84 



04 



99.89 



73.10 

 14.29 



04 

 04 



53 

 18 

 08 

 36 

 54 

 07 

 18 



100.58 



70.13 

 15-47 

 ■52 

 05 

 85 

 60 

 72 

 39 

 48 

 01 

 30 



• 03 





•03 



•05 



.02 



.09 



.02 



.07 



.07 



.08 





.05 



99.86 



66.59 



14-54 

 2 .42 



2-43 

 1. 18 



2-15 



3-o8 



5.62 



.46 



.40 



•03 

 .06 

 .08 

 •23 



.17 



100.25 



Note. Cr 2 03 and C0 2 absent in nos. 1, 4, 5 and 6. 



1 White (bleached) granite near limestone, 1 mile north of Redwood 

 (5K10, Alexandria sheet), from a small boss of Laurentian granite gneiss. 

 Analysis by E. W. Morley. 



2 Morris granite of Long Lake quadrangle, one of the later granites of 

 the region. N. Y. State Mus. Bui. 115, p. 511. 



3 Laurentian granite gneiss from the Methuen bathylith of central On- 

 tario. F. D. Adams, Jour. Geol. 17:17. 



4 Laurentian granite gneiss of the Alexandria bathylith, x /\ mile south 

 of Alexandria Bay (6E5, Alexandria sheet), analysis by E. W. Morley. 



5 Laurentian granite gneiss of Antwerp bathylith, 2 miles east of Theresa 

 (i6M4b, Theresa sheet), chosen for analysis because of apparent slight 

 digestion of amphibolite. E. W. Morley, analyst. 



6 Picton granite, from a quarry 1 mile southeast of Grindstone, Grind- 

 stone island (2F3, Grindstone sheet). Analysis by E. W. Morley. 



That the granite gneisses hold abundant amphibolite inclusions in 

 various stages of digestion, so that the rock is quite variable in 

 composition, has already been stated. The rock of analysis 4 was 

 carefully selected as representative of the normal, acid phase of 

 the rock, free from amphibolite contamination. It is a quite normal, 

 rather acid granite, and comparison with analysis 3 shows close 

 agreement except that the relative proportions of the alkalies are 



