Age of zircons from the xenolith of metapelite in granitoids of the Verkhisetsk massif (Middle Urals): Evidence for granite-related stages of metamorphism

Resumo

Two age stages in the formation of high-aluminous gneisses related to the major stages of granite formation of the Uralian mobile belt were revealed in this study. The first stage (372 ± 2 Ma) corresponds to the age of metamorphism of the amphibolite facies and is controlled by intrusion of the tonalite–trondhjemite series under the environment of the continental margin. At the second stage (307 ± 3 Ma), gneiss underwent contact metamorphism under the influence of plutons of the adamellite–granite composition formed during the early episodes of collisional metamorphism.