Malo-Kunaleiskii

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Occurrence number:

136-03-061

Country:

Russia

Region:

South Eastern Baikal sub-province

Location:

Longitude: 107.05, Latitude: 51.2

Carbonatite:

Peralkaline syenites and quartz syenites form an approximately circular intrusion with an area of 120 km2. The enclosing rocks include rhyolitic lavas and tuffs, normal syenites and granosyenites and late Palaeozoic granites. The peralkaline syenites and quartz syenites are medium- and coarse-grained leucocratic rocks formed principally of alkali feldspar which sometimes encloses crystals of plagioclase. The mafic minerals are represented mainly by katophorite with aegirine or biotite in subordinate amounts. Remnants of diopside are present in the nuclei of katophorite crystals. Numerous dykes of peralkaline quartz syenite, granite and microgranite are present.

Age:

K-Ar determinations on amphibole from peralkaline syenite gave 233 Ma (Zanvilevich et al., 1985). A Rb-Sr isochron on rocks and minerals gave an age of 233±5 Ma (Shergina et al., 1979).

References:

SHERGINA, Yu.P., MURINA, G.A., KOZUBOVA, L.A. and LEBEDEV, P.B. 1979. The age and some genetic features of the rocks of the Kunalei Complex in Western Transbaikalia according to the data of the Rb-Sr method. Doklady Akademii Nauk SSSR, 246: 1199-202.

Map:

Fig. 2_219. Malo-Kunaleiskii (after Zanvilevich et al., 1985, Fig. 2.5).

Location:

All locations > Europe > Russia > Baikal > South Eastern Baikal Sub-Province

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