stripes
Occurrence number:
084-00-030
Country:
Kazakhstan
Location:
Longitude: 76.08, Latitude: 50.45
Carbonatite:
No
Having a crescentic outline and an area of about 1 km2 the Polumesyats intrusion is composed of coarse- and medium-grained arfvedsonite-riebeckite granites with a subordinate role played by fine-grained riebeckite granite and peralkaline granosyenites. Dykes of granosyenite porphyry and peralkaline granosyenite porphyry occur. The rocks are rich in accessories including zircon, orthite, monazite, thorite and fluorite.
Age:
Geological data indicate a late Palaeozoic age.
References:
Geological map of the USSR 1:200,000, 1960, Sheet M-43-XVII. NURLIBAYEV, A.N. 1973. Alkaline rocks of Kazakhstan and their ore deposits. Nauka, Alma-Ata. 296 pp.
Map:
Fig. 2_79. Polumesyats (from Geological Map of the USSR, 1960. Sheet M-43-XVII, 1:200,000).
Location: