680 



DEPARTMENT OF THE INTERIOR 



2 GEORGE V., A. 1912 



Table XLIV. — Showing the average compositions calculated for the Principal 



Igneous-rock Types. 



GROUP I. 





Plutonics. 



Effcsives. 





1 



2 j 3 



4 



5 



6 



7 



8 



No. of 

 Analyses. 



Pre-Cambrian Granites, in- 

 cluding 16 analyses of 

 Swedish types (Osann). 



Pre-Cambrian Granites of 

 Sweden (Holmquist). 



Granites younger than the 

 Pre-Cambrian (Osann and 

 Clarke). 



a 

 a 



cS 



03 

 O 



03 



_o 



"S 



ft 

 "IS" 



*"< J* 

 O TO 



®o 







b 

 



ho 



.5 



J3fl" 



u a 



a cs 

 •— 05 



3 



p 



cS 

 >> 



X> 



TJ 

 CC 



s 

 *2. 



-1-3 CQ 



1-3 



b 



e« 



>> 

 Xi 



<D 



s 



«? 

 OS oS 



GO 



82. 



■3 2 







a 



02 

 O 



>> 

 u 



>> 



-c 

 a 







N 



c8 



S 



47 



114 



184 



236 



64 



24 



40 



50 



Si0 2 



Ti0 2 



A10 3 .... 

 Fe„0 3 .... 



FeO 



MnO .... 

 MgO .... 

 CaO 



Na 2 .... 

 K 2 

 H 2 

 P 2 6 



71 06 



•48 



14 10 



146 



1-63 



•18 



•59 



1 97 1 



324 



450 



•69 



10 



69 81 



•54 



13 76 



217 



187 



•26 



•84 



2 20 



3- 17 



438 



74 



•26 



69 



14 

 1 

 1 



1 

 2 

 3 

 3 



73 



34 



98 



62 



66 



11 



08 



20* 



28 



95 



78 



27 



69 92 



•39 



14-78 



1-62 



1-67 



13 



•97 



215 3 



328 



4 07 



•78 



•24 



72 



13 



1 



1 

 3 

 4 

 1 



60 

 30 

 88 

 43 

 82 

 12 

 38 

 32 

 54 

 03 

 52 

 06 



72 90 



•48 



14 18 



165 



■31 



13 



•40 



113 



3 54 



394 



133 



01 



72 



13 

 1 



1 

 3 



4 

 1 



62 

 25 

 77 

 29 

 90 

 12 

 38 

 43 

 55 

 09 

 53 

 07 



72 



14 



1 

 1 



1 

 2 

 4 

 1 



36 

 33 

 17 

 55 

 01 

 09 

 52 

 38 

 85 

 56 

 09 

 09 



Calculated as Water-free. 



Si0 2 . ... 



71 56 



70 33 



70-28 



70 47 



73 72 



73 89 



73 75 



73 16 



Ti0 2 





48 





54 





34 





39 





30 





49 





25 





33 



A1 2 3 .... 



14 



20 



13 



86 



15 



10 



14 



90 



14 



10 



14 



37 



13 



99 



14 



33 



Fe 2 O s ... 



1 



47 



2 



19 



1 



63 



1 



63 



1 



45 



1 



67 



1 



31 



1 



57 



FeO 



1 



65 



1 



89 



1 



67 



1 



68 





83 





31 





91 



1 



02 



MnO .... 





18 





26 





11 





13 





12 





13 





12 





09 



MgO .... 





59 





85 



1 



09 





98 





40 





41 





39 





53 



CaO 



1 



98 l 



2 



22 



2 



22 2 



2 



17 3 



1 



34 



1 



14 



1 



45 



1 



39 



Na 2 0.... 



3 



26 



3 



19 



3 



31 



3 



31 



3 



59 



3 



59 



3 



60 



2-88 



K 2 



4 



53 



4 



41 



3 



98 



4 



10 



4 



09 



3 



99 



4 



16 



4 61 



P2O5. .,. 



10 



•26 



■27 



•24 



06 



01 





07 



09 



Each sum = 100 00. l Includes "08% BaO and 01% SrO. 

 Includes 06% BaO and 02% SrO. 



2 Includes "06% BaO and 02% SrO. 



