Alkaline Rocks and Carbonatites of the World

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Kolbashinskii (Karabalty-Kol'Bashi)


Occurrence number: 
Longitude: 73.73, Latitude: 42.33

Kolbashinskii is a volcanic field situated in the Kirgiz shield of the northern Tyan-Shan west of lake Issyk-Kul. Leucite-bearing basaltoids form an east-west-trending zone 40-45 km long and 5 km wide. They comprise the so-called "Kolbashinskaya suite" that is divided into three series which, from the base upwards, consists of (1) leucite-bearing basaltoids, including leucite tephrites, (2) alkaline trachytes and (3) tuff-breccias and tuffs of peralkaline trachyte.

K-Ar indicated 309-270 Ma (Bagdasarov et al., 1974).
BAGDASROV, E.A., ORLOVA, M.P. and KOZYREV, V.I. 1974. Rare and trace elements of alkaline gabbroids and basalts of the North Tyan-Shan. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva., 6: 682-94.GORETSKAYA, E.I., UGLOV, S.M. and LESKOV, S.A. 1957. Materials on geology and metallogeny of South Gizzar. Doklady Akademii Nauk Tadzhikskoi SSR, 9: 68-72.
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