Abstract
The results of studies of the Chechek and Akhmirovo dyke belts (the Kalba-Narym zone of Eastern Kazakhstan) constituted by rare-metal Li-F-granitoids (ongonites) are presented. The results of geochemical mapping of dyke belts are given, as are the first-obtained data on the rare-metal composition of rock-forming minerals and melt inclusions. The data on precision dating of rocks by means of the 40Ar/39Ar-isotope technique are presented. It is shown that the dyke belts were formed from the melts of three different geochemical types. The existence of these types might be caused by differentiation within the deep-seated magma chambers. The data of geochronology permit us to conclude that the centers of rare-metal Li-F-magmatism characteristic of the large magma provinces that appeared under the impact of mantle plumes on the arisen continental crust might have been formed at the final stages of the formation of the Kalba-Narym batholith. This allows one to assume the rare-metal Li-F-granitoids (ongonites) of the dyke belts in Eastern Kazakhstan belong to the large Late-Paleozoic magma province that appeared in the region of Central Asia as a result of the activity of the Tarim plume.
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