Alkaline Rocks and Carbonatites of the World

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Polumesyats (Kokon)

stripes

Occurrence number: 
084-00-030
Country: 
Kazakhstan
Location: 
Longitude: 76.08, Latitude: 50.45

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.
Location: 
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith