The Fore-Yenisei sedimentary basin: Seismic-geological model and geodynamic history

Abstract

Regional seismic surveys and drilling data from the eastern part of the West Siberian plate west of the Yenisei River reveal thick moderately deformed Neoproterozoic and Early Paleozoic sediments that belong to an ancient basin of Fore-Yenisei under the Mesozoic-Cenozoic cover. Synthesis of new geological and geophysical data provide updates to the seismic-geological model, including 2D sections, structural and geological maps, and tectonics. The results have been used to reconstruct the Neoproterozoic and Paleozoic geodynamic history of the western Siberian craton.

Geodynamic Model of the Neoproterozoic Evolution of the Yenisei Paleosubduction Zone (Western Margin of the Siberian Craton), Russia

“…The Early Cambrian was predominated by deepsea oceanic sedimentation conditions, corresponding to the active parts of the back-arc basin of the new Early Paleozoic island-arc system, located in the west of the Kas-Turukhansk microcontinent, which was consolidated with the Siberian Craton. Fragments of similar formations were discovered by drilling in the Vezdekhodnaya area in the southeast of the West Siberian Platform [26,27], as well as in other areas in the southwestern frame of the Pre-Yenisei sedimentary basin. To the south of the back-arc basin, similar Ediacaran, Cambrian, and Ordovician complexes are common within the Kuznetsk-Alatau volcanic zone.…”

“…The results of large-scale geological and geophysical research in the last two decades by the Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences (Novosibirsk) in the southeastern part of the West Siberian Plate have substantiated the existence of a Pre-Yenisei Late Neoproterozoic-Paleozoic sedimentary basin that formed on a rigid crustal block (Kas-Turukhansk microcontinent) and adjoined the Yenisei Ridge at the Cryogenian-Ediacaran boundary [13,26,27]. Study of a volcanoplutonic complex opened by drilling sites near Tyn'yar (east of the Khanty-Mansi Autonomous Okrug) carried out by the Institute of Geology and Geochemistry, Ural Branch, Russian Academy of Sciences (Yekaterinburg) revealed the presence of an ancient sialic crustal block in the Pre-Jurassic basement in the east of the West Siberian Plate.…”

“…The revealed similarities between the lithofacies and the vertical sequence of these Vendian-Cambrian cover formations of the Pre-Yenisei basin with coeval sediments in the southwest of the Siberian Craton are not limited only to drilling data. Their identical structure is revealed by comparative analysis of the waveform characteristic of the Ediacaran and Cambrian complexes in seismic sections of the central part of the basin and southwestern regions of the Siberian Craton [26,27]. Moreover, in some cases, this similarity extends to the entire vertical section from the Vendian to the Cambrian inclusive, up to the coincidence of individual reflectors.…”

Geothermal Model of the Fore‐Yenisey Sedimentary Basin—Transitional Structure between the Ancient Siberian Platform and the Young West Siberian Plate

“…The southern part of the West Siberian basin, which is most thoroughly documented, occupies about 190000 km 2 , its sedimentary infill being about 1000000 km 3 . Substantial improvements were made to the geological model in subsequent works, which also produced valuable results concerning the stratigraphy and geodynamic evolution of the basin (Kontorovich et al, 1999(Kontorovich et al, , 2006(Kontorovich et al, , 2021Saraev et al, 2013;Filippov et al, 2014;Grazhdankin et al, 2015;Filippov, 2016;2017;Kozlov et al, 2020;and others).…”

Early Ediacaran Magmatism in the Yenisei Ridge and Evolution of the Southwestern Margin of the Siberian Craton

“…In addition, the Neoproterozoic-Paleozoic accretionary processes on the western margin of Siberia represent the early stages of formation of the Central Asian Orogenic Belt that are still not fully clear. The area adjacent to the western border of the Yenisei Ridge serves as the basement for the Fore-Yenisei sedimentary basin [7], which is essential for understanding the relationships between the platform cover and the folded margin of the Siberian paleocontinent in this time interval. Previous studies established the features of the tectonic evolution of the Yenisei Ridge orogen in the pre-Ediacaran time-From the transformation of the passive continental margin of the Siberian craton in an active one in the Tonian at~800 Ma, when the Central Angara terrane collided with the Siberian Craton and caused the formation of syncollisional (760-750 Ma) and postcollisional (750-720 Ma) granites [4,6,8,9].…”