REPORT OF TEE CEIEF ASTRONOMER 775 



SESSIONAL PAPER No. 25a 



TABLE^LV. 



Shoiving the average chemical compositions of the more important plutonic and effusive rocks. 

 The corresponding types are arranged in pairs. 













03 







ID 



.2 



















CD 

 ® 



02 



>> 



a. 









CD 



OS 



CO 



id 



m 

 a 



>> 



a 

 



(B 







X! 



ID 



'a 



CD 





s 



u 



■g 



A 



ce 



cS 



U 



a 



N 



-2 





03 



3 







3 



IS 



M 



3 



^ 

 ti 



O 



h3 



Number averaged. 



236 



64 



50 



48 



23 



7 



3 



7 



12 



10 



Si0 2 



70 47 



73 72 



60 90 

 •68 



61 46 



62 46 



63 06 



57-85 



58 24 



55.62 5818 



Ti0 2 





39 





30 





:;s 





56 





46 



•60 



1 



01 



AI2O3 



14 

 1 



90 

 63 



14 

 1 



10 



45 



16 47 



277 



17 

 3 



97 

 67 



18 



07 



"1 



17 

 1 



81 



97 



21-26 

 2 91 



19 79 



}e-56 



16 64 



/3-05 



\ 4-40 



15 



4-23 



16 

 9, 



84 



Ee 2 3 



31 



YeO 



1 



68 

 13 



98 





S3 

 12 



4»t 



332 



•14 



252 



2 

 1 



66 

 06 

 13 



2 



31 

 08 



97 



3 



1 



43 

 01 

 29 



2-41 



4 

 3 



11 



MnO 



10 



MgO 



107 



1-30 



25 



CaO . . 



2 

 3 



17t 

 31 



1 

 3 



34 

 59 



4-35 

 4*03 



3 



4 



13 



1!) 



2 



5 



57 

 58 



1 



5 



11 

 36 



413 



5-93 



3-15 7-24 

 6-44 350 



5 

 3 



79| 



Na 2 



62 



K 2 



4 



10 



94 



4 



09 

 Ofi 



4-54 



•28 



5 



81 

 ■'1 



5 



02 

 14 



5 



42 

 08 



3-90 

 •54 



4-52 



4-14 



•43 



4 



43 



P 2 5 



36 





























Each sum =100 00. f Includes "06% BaO and -02% SrO. J Includes '16% BaO and "07% SrO. 





CD 

 +3 























a 





CD 



















VI 



















03 





CD 



+3 



<p 



O 







CD 



CD 





<D 



O 









t3 









































^3 







s 



'3 



~ 



T3 





"eg 



<D 



O 







nfl 





a 







oi 



o3 









fc 



Ph 







Q 



ft 



«J 



C5 



w 



m 



H 



Number averaged. 



43 



25 



12 



30 



70 



87 



41 



198 



11 



4 



S1O2 



55 38 



58-65 



•4'^ 



21 03 



2-40 



105 



, -13 



•31 



65 82 



67 '67 



57 56 



60 35 



48 95 



49 87 

 1 38 



48 86 



55-62 



Ti0 2 



20 

 3 

 2 



87 

 16 

 42 

 23 



35 



88 



15 

 1 



2 



? 



55 

 99 

 66 

 69 

 05 

 19 



16 

 2 

 1 



1 



33 



81 



47 

 35 



<)4 



16 

 3 

 4 



4 



85 

 90 

 20 

 40 

 13 



17 

 3 

 3 



?, 



78 

 54 

 37 

 17 

 18 

 78 



18 

 3 

 6 



7 



98 

 15 

 21 

 04 

 13 

 62 



1 



16 



5 



6 



4 



73 

 83 

 36 



ii',) 

 15 

 5?, 



•43 



A1 2 2 



15 



5 

 6 



6 



96 



47 

 47 

 ?,-2 



"7 



20 31 



Ee 2 3 



404 



FeO 



1*96 



MnO.. . 





MgO 



235 



CaO 



2 



54 



1-53 



4 



71 



3 



31 



6 



83 



5 



87 



11 



45 



9 



09 



9 



14 



5-68 



Na-0 



8 

 5 



38 

 54 



95 



9-02 

 5-34 



•12 



3 

 2 



86 

 32 

 16 



4 

 2 



18 

 53 



IIS 



.3 

 2 



44 

 15 



3 



2 



63 



<»7 



2 



59 

 90 



■>S 



3 

 1 



L6 

 55 

 46 



4 

 2 



49 



15 

 68 



5-94 



K 2 



3-18 



P 2 E 



49 







































Each sum =100.00. 



