stripes
Occurrence number:
136-03-021
Country:
Russia
Region:
Vitim subprovince
Location:
Longitude: 113.5, Latitude: 54.65
Carbonatite:
No
The Okunevskii intrusion is composed of nepheline syenites and syenites which form interlayered injections in biotite-feldspar schists. Nepheline syenites are grey, medium- to coarse-grained rocks which sometimes have a gneissose texture and consist of nepheline, microcline, plagioclase and biotite. Among accessory minerals zircon, apatite, magnetite, fluorite, pyrite and calcite are present. Secondary minerals are cancrinite, liebenerite and chlorite.
References:
ANDRE’E V, G.V., SHARAKSHINOV, A.I. and LITVINOVSKY, B.A. 1969. Intrusions of nepheline syenite of Western Transbaikalia. Nauka, Moscow. 188 pp.
Location: