34 



NEW YORK STATE MUSEUM 





Table 7 

 Adirondack gabbro analyses compared 



SiO...... 



AI2O3. . . 

 FejOa. . . 

 FeO.... 



MgO. . . 

 CaO.... 



Na^O... 

 K2O.... 



H2O . . . . 



CO2. . .. 



Ti02.... 



P2O.. . . . 



S 



MnO... 

 NiOCoO 

 V2O5.... 



CI 



F 



BaO.. .. 



SrO 



ZrOi.... 



46.40 



14.17 



2.03 



1312 



4-94 

 965 



314 

 1 .12 



.27 



3 03 

 .80 



•14 

 •44 



• 15 

 .04 

 .18 

 . 10 

 •05 



47 



18 



I 



10 



7 

 8 



2 



88 

 90 

 39 

 45 

 10 



36 



75 

 81 

 61 

 12 

 20 

 20 

 07 

 16 

 02 



47.42 



1734 



4.91 



10.22 



5-21 



8.09 



348 

 .1.89 



I 13 



3.60 

 .06 



'!o6 



.21 

 .04 



47 



14 

 I 



13 



5 



16 



45 

 61 

 81 

 24 



13 

 09 

 20 

 60 

 35 

 37 

 57 

 14 

 24 

 02 



46 

 16 



2 

 10 



6 



74 

 63 

 17 

 60 

 II 

 66 

 81 

 86 



85 

 07 



54 

 33 

 II 

 26 

 03 



99-77 



100.02 



100.01 



99.98 



99-77 



44 



15 



2 



12 



10 



7 



3 



97 

 40 

 29 



39 



89 



50 

 02 



56 



75 



23 



18 



14 

 06 

 22 

 02 

 02 



44 

 12 



4 

 12 



5 



10 

 2 



11 

 46 



63 



99 



34 

 20 



47 

 95 

 60 



37 

 26 

 28 

 26 

 17 



99.72 



100.75 



1 One and one-quarter miles south of The Glen, Warren County. E. W. 

 Morley, analyst. Described by W. J. Miller, 



2 Split Rock Mine, Westport, Essex county. W. F. Hillebrand, analyst. 

 Described by J. F. Kemp. 



3 Dike near Nicholville, St Lawrence county. E. W. Morley, analyst. 

 Described by H. P. Cushing. 



4 Woolen Mill, one mile west of EHzabethtown, Essex county. W. F. 

 Hillebrand, analyst. Described by J. F. Kemp. 



5 Two miles south of EHzabethtown, Essex county. W. F. Hillebrand," 

 analyst. Described by J. F. Kemp. 



6 Same exposure as no. 5. W. F. Hillebrand, analyst. Described by J. F. 

 Kemp. 



7 Lincoln Pond, Essex county. George Steiger, analyst. Described by 

 J. F. Kemp. 



These analyses show the Adirondack gabbros to be very similar 

 in composition, the only notable variations being in the contents of 

 AI2O3, MgO, and T\0^. The North Creek sheet gabbro (no. i) 

 agrees most closely with no. 4. 



Cause of the primary variations 

 In attempting to account for the primary variations of thes( 

 gabbros, the writer believes there is strong evidence favoring th< 

 application, to a greater or lesser extent, of Daly's magmatic stopin| 



