Late Weichselian fluvial evolution on the southern Kara Sea Shelf, North Siberia

摘要: Abstract Glaciations had a profound impact on the global sea-level and particularly Arctic environments. One of key questions related to this topic is, how did discharge Siberian Ob Yenisei rivers interact with proximal ice sheet? In order answer question high-resolution (1–12 kHz), shallow-penetration seismic profiles were collected passive continental margin Kara Sea Shelf study paleo-drainage pattern rivers. Both incised into recent shelf, leaving filled unfilled river channels canyons/valleys connecting complex network. These have been subaerially formed during regressive phase Last Glacial Maximum. Beyond shelf depths 120 m particle transport is manifested in submarine channel–levee complexes acting as conveyor for fluvial-derived fines. NE area, uniform draping sediments are observed. Major morphology determining factors (1) fluctuations (2) LGM sheet influence. Most individual show geometries typical meandering appear be an magnitude larger than channel gauge stations land. The paleo-channels dimensions examples could originated by additional water release melt Putoran masses. Asymmetrical 60 m more developed, some places bordered glacially dominated morphology, implying deflection A total 12,000 km acoustic reveal no evidence ice-dammed lake greater areal extent postulated several workers. Furthermore, existence indicative unhindered sediment flow north. Channels situated above 120-m depth exhibit phases ponding or infill lowstand. findings denote non-existence large areas shelf.