49 
gonkian granite (Julianehaab granite). But the nepheline-syenite 
is not in direct contact with the granite; between them lies a 
narrower or broader belt of augite-syenite, which can be fol- 
lowed continuously for a distance of about ten kilometers from 
the north end of Laxefjæld towards the south and west as far 
as Kangerdluarsuk (Pl. Ш). The augite-syenite is subject to 
rapid decay and the syenite zone thus comes to appear as a 
depression for a long distance; it forms the valley between 
Kitdlavat and Laxefjeld (cf. Fig. 5, p. 39 and Pl. VII, Fig. 1). 
North-east of Laxefjæld, near the north-eastern end of the 
augite-syenite belt, the conditions are as shown schematically 
in Fig 8. The main body of the igneous complex is here re- 
w Lujavrite Granile E 
Fig. 8. West—east section through a small mountain N. Е. of Laxefjæld, 
showing junction of newer abyssal rocks and old granite. 
presented by egirine-lujavrite, and this possesses as usual a 
very distinct system of joint planes, which split it up into thin 
plates. As we gradually approach the boundary, the dip of the 
joint planes becomes steeper, until at last they are vertical 
(with the direction S. 10° W.), and along a contact plane with 
the same direction they border on kakortokite, which at this 
place is not banded. The kakortokite is here only about 40 
meters broad; to the east of it we find the augite-syenite, 
forming a belt of similar breadth. Passing from here towards 
the south and south-west, the augite-syenite continues as a 
regular belt, but its breadth gradually increases to several hun- 
dred meters; the crumbling debris of the augite-syenite and 
kakortokite cover the most of the plateau south of Laxefjeld, 
and the precise boundaries of the augite-syenite cannot be 
XXXVIII. 4 
