Recent reactivation of the Siberian craton suture zone under Southern Baikal: from Cretaceous-Paleogene orogen to Neogene-Quaternary rift

Abstract

From the analysis of spatial-temporal distribution of sediments in the south of East Siberia, we present evidence on two stages in the evolution of neotectonic structure: Cretaceous-Paleogene and Neogene-Quaternary. The former was exhibited by formation of the South Baikal orogen accompanied by flank development of the Predbaikal and Selenga-Vitim foredeeps, the latter by the subsidence of the South Baikal basin, its filling of sediments and water simultaneously with the development of the whole Baikal Rift System.

Cenozoic sediments from the Selenga-Vitim Downwarp and Baikal Rift Zone spatially combined in the Uro section

“…1. Schemes of spatial relationships between the South-Baikal paleorange and adjacent downwarps in the late Cretaceous-Paleogene (а) and basins and ridges of the central Baikal Rift Zone in the Pliocene-Quaternary (б), from (Rasskazov, Chuvashova 2018;Rasskazov et al, 2021) and (Florensov, 1960), with changes and additions. Кайнозойские осадочные отложения Селенгино-Витимского прогиба и Байкальской рифтовой зоны Cenozoic sediments from the Selenga-Vitim Downwarp and Baikal Rift Zone вале 31.5-33.5 м находится прослой алевролита желтоватого цвета.…”