stripes
Occurrence number:
136-03-045
Country:
Russia
Region:
South Baikal sub-province
Location:
Longitude: 105.8, Latitude: 50.53
Carbonatite:
No
Nepheline syenites form several small bodies which are concentrated along tectonic zones within a body of syenite porphyries. Gradual transitions from nepheline-free syenite porphyries to rocks of tinguaite type are observed. Sometimes nests occur, rarely exceeding 1 x 2 m, of coarse-grained nepheline syenite and albite-nepheline rock with a nepheline content of 2-3%. There are also albite-nepheline-sodalite rocks with sodalite contents up to 20-25%.
Age:
Mesozoic – by analogy with other nepheline syenites of the region.
References:
KUZNETSOVA, F.V. 1975. Nepheline syenites of the margin of the Borgoi depression. Nauka, Siberian Branch of the USSR Academy of Sciences, Novosibirsk. 92 pp.
Location: