REPORT OF THE CHIEF ASTRONOMER 419 



SESSIONAL PAPER No. 25a 



Table XXVII. 



Analysis of pulaslcite porphyry and related rock. 





1 



la 

 Mol. 





2 







SiO„ . . • 



62 04 



•72 



17 63 



198 



1-57 



tr. 



•99 



1-75 



473 



674 



12 



118 



17 



■20 



1-034 

 •009 

 173 

 013 

 022 



025 

 031 

 076 

 071 



62 



17 

 1 

 2 

 \ 

 1 

 1 

 5 

 6 



1 



/ 



59 



Ti0 2 .... 



54 



A1 2 3 



Fe 2 3 . 



23 



51 



FeO ... 



02 



MnO '. 





MgO 



30 



CaO 



Na o 



99 



50 



K 2 



74 



H„0, at 110-C 





H 2 0, above 110°C 



30 



P 2 5 



001 



11 



CO* :. 



tr. 





99-82 





99-83 



Sp. gr. 



The norm was calculated to be:- 



Quartz.. .. 

 O'rthoclase. 

 Albite. 



AnortMte. . . 

 Hypersthene . 

 Diopside.. .. 

 Magnetite.. . 

 Ilmenite .... 



Apatite 



Water 



2-497 



4-38 



39-48 



39-82 



7-23 



2-30 



■43: 



3-02 



1-37 



•31 



1-30 



99-64 



In the Xorm classification the rock enters the sodipotassic subrang, pulas- 

 kose, of the domalkalic rang, pulaskase, of the persalane order, canadare. In 

 the older classification it is a typical pulaskite porphyry. Col. 2 of Table 

 XXVII shows the result of Professor Dittrich's analysis of the Coryell batholith 

 syenite (made for Mr. Brock: see page 359). Tbe striking chemical resemblance 

 of the two rocks and their analogous positions as the youngest or nearly the 

 youngest intrusives of their respective districts, suggest that they are of 

 approximately contemporaneous origin. For what it is worth this argument 

 tends to substantiate the view stated on page 376 that the Coryell batholith is of 

 Tertiary and post-Oligocene date. 



25a— vol. ii— 27£ 



