The Sources of Cretaceous Magmatism in the Uda Sector of the Western Transbaikalian Rift Region Based on Geochemical and Isotopic (Sr, Nd, O, Pb) Data

Abstract The Uda, Yeravna, and Zaza riftogenic depressions belong to the Uda sector, which serves as the central fragment of the Western Trans-Baikal rift zone. New Sr–Nd–Pb–O isotopic data on the Cretaceous basaltic rocks from each depression in combination with geochemical data made it possible to estimate the compositions of mantle and crustal magmas and to propose a model for their mixing.