THE METAMORPHIC ROCKS OF ADELIE LAND 8TILLWELL. 



131 



Chemical Characters. 



The following analysis of specimen No. 794 was made by A. G. Hall, in the 

 Victorian Geological Survey Laboratory, under the supervision of P. G. W. Bayly. 

 In the second column is placed an analysis of a hornblende norite from St. Thomas 



Mount, Madras, by H. S. Washington*. 



I. II. 



SiOg 50-62 50-04 



AlgO, 11-43 .... 11-65 



Fe 2 0s 4-43 .... 2-63 



FeO 11-11 .... 15-76 



MgO 6-87 .... 5-58 



CaO 10-90 7-89 



Na 2 1-75 3-08 



K 2 0-24 0-89 



H *+ ' 62 '" 



H 2 0- 0-19 .... 



Ti0 2 1-42 1-93 



P 2 6 0-08 .... 0-20 



SO, nil 



Cl tr 



MnO 0-28 



NiO, CoO 0-03 



CoO tr 



Li 2 tr 



99-97 



99-64 



Specific Gr 3-076 



Group Values. 



8. 



54-3 



2-0 



C. 



5-1 



F. 



31-5 



M. 



7-2 



T. 



K. 



1-0 



Projection Values. 



1-0 



c. 



2-7 



16-3 



The analysis demonstrates the affinity of this rock type to the amphibolites. The 

 character of the felspar is reflected in the proportion of potash to soda and in the relation 

 of both of these to the high lime percentage. The iron percentage is a little greater 

 than in the Cape Denison amphibolites. The silicity is the mean of those of the two 

 analysed Cape Denison amphibolites 



When this analysis of the Antarctic rock is compared with that of the hornblende 

 norite a basic member of the Charnockite series of India points of great similarity 



" The Charnockite Series of Igneous Rooks," H. 8. Washington, Amer. Journ. ScL, vol. XLI., 4th Ser., 1916, p. 323. 



