stripes
Occurrence number:
084-00-050
Country:
Kazakhstan
Location:
Longitude: 81.23, Latitude: 48.08
Carbonatite:
No
The 17 km2 Biesimas peralkaline intrusion is part of a larger, late Palaeozoic granite massif. It is composed of medium-grained porphyritic and fine-grained riebeckite granites which contain small amounts of aegirine and arfvedsonite and accessory zircon, bastnaesite, thorite, magnetite and fluorite. There are pegmatites and dykes of peralkaline granite porphyry and aplite.
Age:
257 Ma by K-Ar.
References:
ZIRYANOV, V.N. 1964. Nepheline syenites of the middle Prichingiz. Izvestia Akademii Nauk Kazakhstan SSR, Alma-Ata. Seriya Geologicheskaya, 5: 57-67.
Map:
Fig. 2_85. Relationship of the Biesimas (1), Iisorskii (2), Bolshoi Espe (3) and Malyi Espe (4) intrusions (from Geological Map of the USSR, 1960. Sheet M-43-XXXIV, 1:200,000).
Location: