Alkaline Rocks and Carbonatites of the World

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Zhil'Tauskii

stripes

Occurrence number: 
084-00-029
Country: 
Kazakhstan
Location: 
Longitude: 75.73, Latitude: 50.25

This stock-like intrusion of 12 km2 is composed predominantly of medium-grained porphyritic peralkaline granites which cut porphyritic peralkaline syenites and quartz syenite porphyries. The associated dykes are of peralkaline granite porphyry. The rock-forming minerals are anorthoclase, albite, quartz, hastingsite, arfvedsonite and aegirine. Autometamorphism is manifested by the development of albite and fluorite, sometimes by kaolin and by a greisenization. Accessory minerals are zircon, ilmenite, apatite, fluorite, garnet, monazite, anatase, titanite and fluorite.

Age: 
Geological evidence indicates a late Palaeozoic age.
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