MAGMATIC DIFFERENTIATION IN KOCKS 



17 



Group B — Effustves {upper Part of Flow). 



Component.s. ' 



1 



M 



2 



SiO., 



46.45 



49 '^0 



TiO^ 



2 26 



\UOs 



16.60 

 2.72 

 7.25 

 9.21 

 6.32 

 4.05 

 1.02 

 5.01 

 C02 0.40 



16.00 



FeoOg 



3.113 



FeO 



7.10 



MgO 



6.98 



CaO 



3.44 



NaoO 



5.05 



KoO 



1.31 



HoO 



4.51 







aOl.l7 



Sum 



99.03 

 2.781 





Sp. Wt 









Group C — Normal basic Intrusives. 



Components. 



1 



2 





4 



SiO» 



47.99 

 2.71 



16.57 

 0.01 

 5.13 

 6.01 

 9.36 

 2.00 

 1.39 

 2.64 



47.83 



47.50 



45.73 



Ti09 





AloO» 



*30.28 



} '■- 



*4.32 

 6.72 

 1.30 

 Tr. 



2.05e 

 2.19 



*22.44 

 7.40 



*3.71 

 10.21 

 1.62 

 1.29 

 2.85* 

 0.34 



13.48 



FeoOg 





FeO 



11.60 



MgO 



15.40 



CaO 



9.92 



NaoO 



3.24 



KoO 



0.47 



H.,0 



0.94 



p.,0= 













*99.90 



92.26 



97.36 



100.78 







Group D — Quartzi/erous basic Intrusives {central). 



Components. 



1 



2 



3 



4 



SiOo 



54.11 



0.85 

 12.09 

 4.00 

 11.51 

 3.47 

 6.72 

 2.73 

 1.49 

 1.39 

 0.12 



57.50 



52.47 



52.06 



rpiOo 





AUOg 



*23.44 



1 5.07 



*2.76 

 5.62 

 2.01 

 0.45 

 2.256 

 2.02 



*25.54 

 6.31 



*2..31 

 6.62 

 3.23 

 0.54 

 1.28e 

 1.16 



13.67 



FooOa 





FeO 



15.97 



MgO 



5.01 



CaO 



8.15 



NagO 



3.36 



KoO 



0.86 



HoO . . 



1.05 



P„Os 











99.23 



101.12 



99.46 



100.13 







* Loss on ignition. 

 Ill— Bull. Geol. Soc. Am., Vol. 10, 1898 



