Alkaline Rocks and Carbonatites of the World

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Karsakpai

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Occurrence number: 
084-00-015
Country: 
Kazakhstan
Location: 
Longitude: 66.42, Latitude: 47.88

Karsakpai is situated in the central area of the Mai-Tubinskii anticlinorium and lies amongst Middle Proterozoic crystalline schists, amphibolites and granite gneisses. The complex is about 6x4 km and has a concentric ring structure. It is composed principally of alkaline melanocratic syenites, with rather less abundant leucocratic ones; liebenerite syenites and nepheline syenites are subordinate. The complex was generated by the intrusion of the following phases: (1) monzonite and syenite-diorite; (2) albite-hastingsite syenite; (3) feldspar-bearing urtite; (4) melanocratic alkaline syenite (lepidomelane-hastingsite, augite-hastingsite and lepidomelane); (5) nepheline syenite; (6) dykes including trachytic syenites, syenite porphyries and syenite pegmatites. Albitised and liebeneritized syenites occur throughout the complex.

Economic: 
Rare earth mineralization is typically associated withalbitization of syenites and is represented by zircon, baddeleyite, apatite, titanite, orthite and thorite (Nurlibayev and Panchenko, 1968).
Age: 
Geological evidence indicates a lower Devonian age (Nurlibayev and Panchenko, 1968).
References: 
NURLIBAYEV, A.N. and PANCHENKO, A.G. 1968. Alkaline and subalkaline rocks of Northern Kazakhstan and Kirgizia. Izd-vo Nauka Kazakskoi SSR, Alma-Ata. 100-7.
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