Zirconium-hafnium geothermometer for а-granites of the Subpolar Urals

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 geothermometer 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 determine 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 confirmed that the Badyayu and Yarot massifs belong to pronounced fractured plutons, while the Kozhim massif belongs to conditionally fractured plutons