RE 
— AN:o1) Igneous Rocks of Sviatoy Noss in Transbaikalia. 23 
> Southwest of Makarova the migmatite dominates. In the 
form of dikes the aplitic granite, however, is common in all 
the exposures of the southern part of the peninsula. 
On the coast of the Tshivirkouy Bay, aplitic granite was 
observed at several localities, which seem to be separate 
occurrences, some of them dike-formed, other forming 
smaller massifs in the mixed formation. A few of the occur- 
rences may be mentioned: At point 141 A, is exposed 
 aplitic granite, forming stretched out masses along the main 
strike and interstratified with limestone. At point 142 A 
occurs a larger body of grey granite showing distinct parallel 
arrangement along the strike, N 70? E. The rock is poor 
in coloured constituents and rich in quartz. Going further 
— upwards in a northwesterly direction the granite grades, at 
point 143 A, into migmatite, enclosed fragments of ampbhi- 
bolite becoming more and more numerous. 
| Further south, at points 156 A and 157 A the main part 
of the rock is a porphyritic gray granite which, however, 
frequently grades into the even-grained aplitic variety. This 
is especially the case around fragments of amphibolite and 
in apophyses from the granite into the amphibolite. The 
— even-grained granite is here commonly hornblende-bearing. 
At point 158 A was found only even-grained hornblende- 
— granite intruding limestone. Fragments of andradite-skarn 
are included in the granite. Such is also the case at point 
160 A. Going farther south one finds the porphyritic variety 
oto become 'dominating, but there are transitions into the 
— aplitic variety, e. g. at points 170 A and between 172 and 
175 A, where numerous schlieric portions richer in biotite 
than the main rock are apparently remnants of assimilated 
—. amphibolite fragments. Still at Irkana, in the inner part of 
— the Tshivirkouy Bay, within the granodiorite area, a few 
larger masses of even-grained granite occur. 
— From the observations quoted it appears that the even- 
grained aplite-like granite chiefly appears at the margins 
of the batholith whose main parts are built up by the por- 
— Phyritic variety. The field-observation was not quite suffi- 
 v.  cient to show, how regular the aplitic marginal zone may be. 
