CRYSTALLINE BASEMENT 31 
The injection process was not only limited to a mingling of the 
a granite magma with the schist mass. There are also on a gigantic 
scale the signs of an resorption, in the extreme cases conducing 
to almost homogeneous rocks of different composition. Natu- 
tally all stages on the way to a complete resorption may be 
observed. The mica schist passes into a dark gneiss of quite 
a homogeneous habit, and the amphibolite breccias are gra- 
dually dissolved into a chaotic mixture, or ,stew“, of resorbed 
ot partly resorbed xenoliths and granite. The extremely resorbed 
amphibolite or, more correctly, a basic secondary granite magma, 
has, as stated later on, a considerable extension in this zone. 
The incompletely absorbed masses, the inhomogeneous mixtures 
show often a roughly parallel structure; the fragments and the 
almost resorbed spots are oriented in common direction, indicating, 
that the whole mass was in a flowing motion before consolida- 
tion. Also the completely absorbed masses develop in some cases 
flow structure. 
Petrographical characteristics. 
The petrographical description of this zone may begin with 
the amphibolite and its metamorphic products, because they 
play the most important part in the general composition of the 
zone. | 
The great amphibolite breccias show often the unchanged amphi 
bolite without other signs of the granite action, but a complete 
recrystallisation. The fragments are angular and often of a consi- 
derable size. The contours are sharp against the matrix, which is a 
pegmatitic, pale coloured granite, carrying isolated amphibole and 
epidote of greater size. The structure of the rock fragments is 
granoblastic and often coarse, and towards the edge the grains 
increase in size, probably by influence of the pegmatite matrix. The 
borders are therefore not seldom on the rock surfaces marked with 
a black fringe (great amphibole individuals). 
