Late Pliocene‒Quaternary (<2.7 Ma) Sedimentation in the Eurasian Basin (Arctic Ocean)

Abstract

Geomorphological analysis and age correlation of the Late Pliocene–Quaternary regional stages identified in the ARC1407A seismic section by onlapping the oceanic basement, with the age specified based on calculations of the position of theoretical linear magnetic anomalies, were carried out. Interpretation of the ARC1407A seismic time section makes it possible to use the previous seismostratigraphic correlations of glaciomarine deposits for the western Barents Sea and the northeastern part of the adjacent deep-water basin. Based on the geomorphological analysis, extended canyon systems were identified in the Nansen Basin and eastern Amundsen Basin. Significant amounts of sedimentary cover in the Nansen Basin are glaciomarine sediments deposited since the end-Late Pliocene. In the central Nansen Basin, glaciomarine sediments were deposited simultaneously from two closely located troughs (Saint Anna and Voronin). Glaciomarine sediments, transported to the central Nansen Basin cyclically, have a mixed character (underwater landslides and turbidite flows). In the Amundsen and Podvodnikov basins, glaciomarine deposits began to form in the second half of the Middle Neopleistocene.