Abstract
Studying the relationship of fluctuations of zirconium and hafnium in magmatic zircon and mineral-containing rock allowed L.Y. Aranovich and N.S. Bortnikov to develop a ge¬othermometer based on this marker ratio. The study of silicate and microprobe analyses from granites of A-types in the north of the Subpolar Urals made it possible to de¬termine the rock formation temperatures of the studied massifs. According to the calculations, the granites of the Kozhim massif were formed at temperatures from 799 to 914° C, the granites of the Badyayu massif - from 763° C to 928° C, the granites of the Yarot massif - from 768° C to 932° C. The analysis of the distribution of the obtained maximum temperatures on the geological scheme con¬firmed that the Badyayu and Yarot massifs belong to pro-nounced fractured plutons, while the Kozhim massif be¬longs to conditionally fractured plutons.
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