TATT AG fv 
VE FÖRT : 
A N:o 1) Igneous Rocks of Sviatoy Noss in Transbaikalia. 77 
All the rocks mentioned for comparison are geologically 
associated with other alkaline rocks, mostly with nephelite- 
syenites. The soda-granite from Iviangusat is very interesting 
in its genetic relations as explained by Ussing 3): The rock 
occurs ås an endomorphic aureole around augite-syenite 
towards sandstone and has originated by a process of resorp- 
tion, the augite-syenite magma having dissolved the marginal 
parts of the quartzose sedimentary mass. 
The sviatonossites. The analyses of the sviato- 
nossites carried out are quoted in the following table along 
side with some analyses of such rocks whose composition 
shows closest resemblance to the sviatonossite. We shall at 
first consider the monzonites and some calcialkalic syenites, 
of which the akerite may serve as an example. Thereafter we 
shall pay attention to the malignite and some varieties of 
the borolanites and finally to some leucite-bearing volcanic 
rocks, as leucite-tephrites and leucitites, which will be found 
to have remarkable analogies with the rocks in question. 
I. Sviatonossite, from the shore-drift on the western 
coast of Sviatoy Noss. Analyst P. Eskola. 
II. Sviatonossite, point 59 B, Sviatoy Noss. Analyst 
P. Eskola. 
III. Monzonite, Monzoni. Anälyst V. Schmelck. W. C. 
Brögger, »Die Eruptivgesteine des Kristianiagebietes» II, 
p. 24 (1895). | 
IV. Pyroxene-syenite (= monzonite), Gröba, Saxony. 
Analyst Wolfrum. G. Klemm, Erläuterungen zur geol. 
Specialkarte des Königsr. Sachsen, Section Riesa-Strehla, 
Blatt. 16, p. 23 (1889). / | | 
V. Akerite, Foss in the Lougen valley, Christiania 
Region. Analyst V. Schmelck. W. C. Brögger, »Die Eruptiv- 
gesteine des Kristianiagebietes» II, p. 33 (1895). 
VI. Garnet-pyroxene-malignite, Poohbah Lake, District 
of Rainy River, Ontario. Analyst W. C. Blasdale. A. C. 
Lawson, »On Malignite», University of California, Bull. Dep. 
'Geol. Vol. I. p. 356 (1896). 
TOP; seit.-p., Ll6. 
