Alkaline Rocks and Carbonatites of the World

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Biesimas

stripes

Occurrence number: 
084-00-050
Country: 
Kazakhstan
Location: 
Longitude: 81.23, Latitude: 48.08

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.
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