1914—15] Fj eldby gningen mellem Sørfjorden og' Samnangerfjorden. 241 



the area, which I have designed on the map by the colour of the 

 labradorite-rock. 



On the whole, the labradorite-rock is so basic that it forms a 

 transition to noryte and gabbro. The pyroxene is almost as a rule 

 metamorphosed into hornblende; in some types, however, we may 

 meet with rhombic and some monoclinic pyroxene. The felspar is 

 often saussuritisized. Also basic segregations of pyroxene and iron 

 ore occur here. Very interesting is a peculiar basic separation in 

 the immediate vincinity of the houses of Hagasæter, where a dark, 

 greyish rock with numerous deep-red garnets occur; they are 

 surrounded by a zone of lighter colour (fig. 76). By microscopical 

 investigation it appears that round-shaped aggregates of plagio- 

 clase lie in the principal mass, essentially consisting of a green, 

 monoclinic pyroxene with green hornblende, some ore and garnet. 

 In the centre of these aggregates there may be a large garnet 

 (fig. 77), or we may find on the border against the dark principal 

 mass, a narrow edge of fine-grained garnet. 



In the upland N. N. E. of Nordviksæteren there is a garnet- 

 bearing labradorite-rock. By microscopical investigations we see 

 numerous small, light-coloured, irregularly defined garnets, lying 

 in a fine-grained, strongly compressed ground-mass, chiefly consisting 

 of plagioclase, but also holding some microperthite and some quartz. 

 The structure may be seen from fig. 78. Green spinel, some rutile, 

 thin streaks of chlorite and brownish-yellow mica are enclosed in 

 the garnet. The latter constituent sometimes envelops the rutile- 

 grains. At times some magnetite is seen together with the rutile- 

 individuals. 



Norytes. 



Noryte occurs, as previously mentioned, especially in the sec- 

 tions Trengereid— Vaksdal, nos. CIX and CXI, which are separated 

 from ono another by a belt of mangerite about 2 m. broad. In the 

 noryte we find various lenses of blue-quartz, and a lense of labra- 

 dorite-rock. In a noryte with small fragments of quartzite were seen 

 microscopically some ore and brown biotite, red garnet, rhombic 

 pyroxene and plagioclase. 



In CXIII we find another zone of norytic rocks. The rocks 

 here are more or less uralitisizcd and contain garnet and rutile. 

 In one of the slides small veins of a kind of noryte partly with 



