GEOLOGY OF THE BROADALBIN QUADRANGLE 



21 



1 2 3 4 5 



Si0 2 1 66.35 



AI2 O3 14 .09 



Fe 2 3 

 FeO. . 

 MgO. 

 Ca O. 

 Na 2 0. 

 K 2 0. . 

 H 2 0. . 

 Ti0 2 . 

 P2O5. 

 Mn O 



S 



CI.... 



F 



Ba O. 

 ZrO.. 

 C0 2 .. 



1. 81 



4-49 

 1.05 



3.16 



3 -32 



4.08 



•35 



1 .00 



.40 



•17 

 .04 

 .02 

 •03 

 •03 

 trace 



100.39 



64 -47 



10.51 



1 . 11 



7-37 



5-21 



3.10 



2 .21 



3 63 

 •93 



•25 

 . 12 



58 



99-49 



62 



18 



2 



4 



3 

 3 

 4 



41 

 75 

 49 

 9i 

 61 



17 

 09 



25 

 4i 



61 .01 

 I5-36 



\2.98 



/ 7-77 



•78 



405 



3-68 



3 -90 

 ■49 



.08 



100.09 100.10 



7i 



13 

 1 



45 

 83 

 10 



9i 



56 



44 

 62 

 09 

 32 

 42 

 03 

 17 

 02 



03 

 01 

 02 

 02 



66 



16 



1 



2 



2 

 4 

 5 



72 

 15 

 23 

 19 

 73 

 30 

 36 

 66 



77 



07 



68 



50 



14 



69 



1 



34 



3 



25 





26 



2 



20 



3 



50 



5 



90 





40 





03 





10 





05 







100.04 1100.18 100.22 



1 Quartz-hornblende-syenite (Adamellose) from 1 mile northwest of Northville. E. W. Morley, 



analyst. 



2 Syenite, gneissoid (Adamellose). Whitehall, N. Y. W. F. Hillebrand, analyst. N. Y. State 



Mus. Bui. 138, p. 45. 



3 Augite-syenite (Adamellose). Ticonderoga, Essex co. M. K. Adams, analyst. N. Y. State 



Mus. Bui. 138, p. 45. 



4 Augite-syenite (harzose). 3! miles north of Tupper Lake Junction. E. W. Morley, analyst. 



N. Y. State Mus. Bui. 115, p. 514. 



5 Biotite-granite-porphyry (Toscanose). ij miles north-northwest of Northville. E. W. Morley, 



analyst. 



6 Augite-syenite (Toscanose). Little Falls, N. Y. E. W. Morley, analyst. N. Y. State Mus. 



Bui. 115, p. 514. 



7 Quartz-syenite (Toscanose). 2\ miles south of Willis pond, Altamont, Franklin co. E. W. 



Morley, analyst. N. Y. State Mus. Bui. 115, p. 514. 



These analyses represent rocks of the syenite-granite series from 

 widely separated places in the Adirondacks and they serve to illus- 

 trate the close chemical relationship existing between the rocks of 

 the series. Still other analyses may be found in Museum Bul- 

 letins 115 and 138. 



Numbers I, 2, 3, and 4, in the quantitative system, all belong 

 in class 2 (Dosalane) and order 4 (Austrare). The first three are 

 in rang 2 (Dacase) and subrang 3 (Adamellose) while the fourth 

 is in rang 3 (Tonalase) and subrang 3 (Harzose). 



Numbers 5, 6, and 7 are all in class 1 (Persalane) ; order 4 (Brit- 

 tanare) ; rang 2 (Toscanase) ; and subrang 3 (Toscanose). 



Thus, according to the chemical classification, the only important 

 difference between the first four and the last three is thai of class 

 and even this is not always sharp as shown in the cases of the 

 Northville syenite and granite. 



