Petrogeochemical and Isotope Peculiarities of Supersubduction Terrigenous Deposits: The Example of Predivinsk Terrane of the Yenisei Ridge

摘要

This study is aimed at revealing petrogeochemical and isotope specifics of terrigenous rocks occurring in close paragenetic association with island arc magmatic complexes from the example of Neoproterozoic complexes of the Predivinsk Terrane of the Yenisei Ridge. This terrane is located in the southwestern part of the ridge and composes the Sayany-Yenisei accretion-collisional belt. It consists of a number of tectonic plates overthrusted in the NE direction along the Priy-enisei (Predivinsk) thrust (Fig. 1) [1-4]. Two large tectonic blocks with different sets and compositions of rock associations (Western and Eastern) are distinguished within the terrane.