| 
A N:o 1) Igneous Rocks of Sviatoy Noss in Transbaikalia. ky 
related to granodiorites, but having alkali-feldspar in excess 
over the lime-soda-feldspar. The name quartz-monzonite 
is in this case in a better accord with the high percentage 
of alkalies, equalling that of some true syenites, as well as 
with a percentage of lime, lower than what is customary in 
granodiorites, and, moreover, a large part of it being con- 
tained in the mafic minerals. 
In Washington's tables, many analyses Ae a similar 
composition, refer to granodioritic rocks from Western 
North-America, that well-known calci-alkalic petrographic 
province. Other similar analyses may be found among those 
of rocks called adamellites and banatites. 
We may safely state that the analysis of the granodiorite 
from Mys Besimyanniy represents the composition of a 
rock-type of very wide-spread occurrence in the Tshivirkouy 
batholith as well as in its continuation in the Bargousin 
valley and neighbouring regions of Transbaikalia. Among 
the analyses of specimens collected by the Radium expedition 
in 1914, that of a granodiorite from »Camp Mountain» in the 
Namama Region near the water-shed between the Bargousin 
and Angara rivers, has a striking similarity to that in question. 
The analysis, made by the writer, gave the following figures: 
Mol. Mol. 
| numb. |, Rp 
SiO, | 66.88f| 1115 | 73.36 | Quartz ..... RES fb 0 OO 
Al,O, | 15.24 | 149 | 9.81 | Orthoclase. ...... 22.24] 
Fe,O, | 1.10 TIN (re SÄND 1te fed ana EL äN 38.77 F = 70.74 
Fe0 2.20 31 | 3.03 | Anorthite . ...... 19.73) 
MnO | 0.11 1 = IE dal 8944 
MgO 1.32 33 2.17 CaSiO, 1.74 
CaO 3.14 56 | 3.68 | Diopside . .y MgSiO, oo ) 
Na,O | 4.60 74 | 4.86 l FeSiO, 0.66: P= 742 
SO | ao | 201 25 | yperstrene MeSIO, 230) 
PaOg. |: 0.25 21 — | Magnetite ....... AGNE ND = Molég 
H,O 0.43 5 ILmenite:r. oa och revs 1.06 $ 
ADALILe: 3115 oxe ed re 0.67 A = 0.67 
Zz fem 10.77 99.21 
99.66 I 100.00 | 
