Content and composition of rock debris at the Lomonosov Ridge (83° N): indication of palaeoenvironmental changes

The results of studying the quantitative, material, and morphometric composition of rock debris in sediments sampled by a box-corer on the Lomonosov Ridge (83° N), Arctic Ocean, during the Severny Polyus 41 expedition (AARI) are presented. Debris ≥1 cm was sampled from each lithological layer according to the description. The age model was created by lithostratigraphic correlation with previously dated cores. The content of debris on the eastern slope and the summit is significantly higher than on the western slope, which is explained by the higher sedimentation rate on the western slope after the deglaciation peak. The carbonate to igneous shift in rock composition and the increase in roundness with time indicate a higher input of Eurasian material in MIS 1.