U-Pb dating of the Verkniy Ufaley intrusion, middle Urals, Russia: a minimum age for subduction and amphibolite facies overprint of the East Europeancontinental margin
R. Hetzel et Rl. Romer, U-Pb dating of the Verkniy Ufaley intrusion, middle Urals, Russia: a minimum age for subduction and amphibolite facies overprint of the East Europeancontinental margin, GEOL MAG, 136(5), 1999, pp. 593-597
The Palaeozoic Uralian orogen formed by accretion of island arcs and microc
ontinents along the eastern margin of the East European platform. In the mi
ddle Urals, a promontory of the East European platform, the Ufaley Complex
experienced eclogite facies conditions followed by an amphibolite facies ov
erprint. The Verkniy Ufaley intrusion crosscuts the amphibolite facies foli
ation in the East Ufaley Complex and thus postdates the two metamorphic eve
nts. A concordant U-Pb age of 316 +/- 1 Ma obtained on magmatic titanite da
tes the intrusion of the pluton and provides a minimum age for subduction a
nd subsequent amphibolite facies metamorphism of the East European continen
tal margin. Zircon yields discordant age data that reflect the involvement
of Proterozoic crustal sources.