116 GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



Table IX. — Chemical analyses of intrusive rocks from Electric Peak. 



Constituent. 



295 



267 



273 



272 



309 



313 



311 



303 



329 



323 



321 



326 



Si0 3 .... 



56. 28 



57.38 



58.05 



61.22 



64.07 



64.85 



65.11 



65.60 



65. 97 



66.05 



67.54 



69.24 



TiO, .... 



.84 



Trace. 



1.05 



.61 



.45 



.91 



.71 



. 75 



.42 



.34 



.80 



.65 



A1;0 3 . . . 



14.23 



16.86 



18.00 



16.14 



15.82 



16.57 



16.21 



17.61 



16.53 



16.96 



17.02 



15.30 



Fe 2 3 ... 



4.69 



2.49 



2.49 



3.01 



3.40 



2.10 



1.06 



.95 



2.59 



2.59 



2.97 



1.72 



FeO .... 



4.05 



5.17 



4.56 



2.58 



1.44 



2.15 



3.19 



2.76 



1.72 



1.38 



.34 



.69 



NiO 









.09 

 Trace. 



.05 

 Trace. 

















JlnO.... 



.16 



Trace. 



Noue. 



None. 



None. 



Noue. 



None. 



None. 



Trace. 



Trace. 



CaO .... 



7.94 ! 7.32 



6.17 



5.46 



4.43 



4.01 



3.97 



3.72 



3.37 



3.37 



2.94 



2.98 



MgO.... 



6. 37 5. 51 



3.55 



4.21 



3.39 



2.14 



2.57 



1.49 



2.11 



2.08 



1.51 



.95 



Li»0 .... 



.01 ' .39 



None. 







None. 



.04 



.03 



.09 



None. 



.03 



None. 



Na.O .... 



2. 98 j 3. 33 



3.64 



4.48 



4.06 



3.71 



4.00 



4.36 



3.41 



4.20 



4.62 



4.46 



K 2 



1.23 ' 1.45 



2.18 



1.87 



2.27 



3.10 



2.51 



2.36 



2.67 



2.53 



2.28 



2.52 



P:O s .... 



.40 Trace. 



.17 



.25 



.18 



.14 



.02 



.16 



Trace. 



Trace. 



Trace. 



Trace. 



SO , 



Trace, i .21 



.07 







Trace. 



Trace. 



Trace. 



.13 



.03 



.26 



.27 



CI 



. 17 .17 



Trace. 







None. 



None. 



None. 



.09 



Trace. 



.15 



Trace. 



mo .... 



Total. 



.93 .42 



.86 



.44 



.52 



.35 



.94 



.59 



1.23 



.69 



. 55 



1.30 



100. 28 



100. 70 



100. 79 



100. 36 



100. 08 



100. 03 



100. 33 



100. 38 



100. 33 



100. 22 



101. 01 



100. 08 



Less 



























for CI . 



.04 



.04 















.02 





.03 

















100. 24 



100. 66 



100. 31 



100. 98 



Table X. — Silica percentages of rocks from Electric Peak. 



Sheet 

 rocks. 



Dike and stock rocks. 



Si0 2 . 



I. 



Ho.- 116. 



He. 



III. 







53.72 

 55.23 

 55.64 

 56.28 

 56. 33 









53.72 

 55.23 

 55.64 



56. 28 

 56.33 

 57.12 



57. 38 

 58.05 

 58.10 

 58.11 

 58.49 

 58.87 

 59.64 

 60.54 













































57.12 













57. 38 

 58.05 

 58. 10 































58.11 









58.49 













58.87 









59.64 











60.54 





















