stripes
Occurrence number:
136-08-007
Country:
Russia
Region:
East Tuva
Location:
Longitude: 98.58, Latitude: 52.38
Carbonatite:
No
The Sorug alkaline intrusive complex cuts Precambrian marbles and gabbroic rocks of lower Palaeozoic age. It includes peralkaline syenites, nepheline-bearing syenites and plagioclase-bearing nepheline syenites; nepheline syenite pegmatites are abundant. There are small cross-cutting granosyenite bodies. The nepheline syenites are composed of nepheline (9-35%), alkali feldspar (40-79%), aegirine-augite (5-17%), biotite (1-18%), amphibole, plagioclase, garnet and not very plentiful Fe-Ti oxide minerals. Mineral compositions are given by Kovalenko and Popolitov (1970).
References:
KOVALENKO, V.I. and POPOLITOV, E.I. 1970. Petrology and geochemistry of the REE of the alkaline and granite rocks from north-east Tuva. Nauka, Moscow, 158 pp.
Map:
Fig. 2_170. Sorug (after Kovalenko and Popolitov, 1970, Fig. 15).
Location: