Alkaline Rocks and Carbonatites of the World

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Akkoitas

stripes

Occurrence number: 
084-00-041
Country: 
Kazakhstan
Location: 
Longitude: 77.22, Latitude: 48.68

A granite intrusion of 9x3.5-4 km Akkoitas possibly is sill-like in form. Biotite granites are the most abundant rocks with less abundant areas of riebeckite and aegirine-riebeckite granites. Aegirine-riebeckite granites are mostly restricted to the upper part of the intrusion, where they form dome-shaped outcrops containing xenoliths of country rock. There is a very strongly developed system of dykes.

References: 
ZIRYANOV, V.N. 1969. Petrology of the metasomatically altered granitoids and alkaline rocks of the Chingizsky zone. Nauka, Moscow. 160 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