VENDIAN SUPRASUBDUCTION VOLCANISM IN THE URALTAU TECTONIC ZONE (SOUTH URALS)

Abstract

The Uraltau tectonic zone is located between paleocontinental and paleoceanic segments of the South Urals and is characterized by a complex structure. It is composed of variably metamorphosed and repeatedly deformed rock complexes with unknown primary ages. Their geodynamic formation settings are also debatable [1, 2]. The Maksyuta eclogite–glaucophane schist complex, which occupies the eastern part of the Uraltau zone, is of key importance for understanding its tectonic history. This complex is divided into two main rock associations: the “subcontinental” metaterrigenous association with metaryhyolites and the “suboceanic” metaophiolitic association. Less common are metavolcanics of the island-arc type, which have never been purposefully studied partly due to their strong metamorphism.