The composition of ridge relief and deglaciation features in the area of the Martimyavr lake (the Kola peninsula)

Abstract

Under consideration are issues of structure, genesis and formation mechanism of end-moraine deposits relief and deglaciation features on the north of the Kola Peninsula. Studied end-moraine deposits set one of the retreat phases of the Barents Sea Stream during the last glaciation in the Middle Dryas. Complex of geological, structural and geomorphological methods was used in this work. It was determined that the ridge relief is composed of glacial deposits (ablation and lodgement tills) lying in forms of faults and thrusts. Some ridges contain both dislocated and normal lying fluvioglacial deposits. Structure analysis of the tills and orientations of the glaciodislocation elements indicate that glacier moved to the east and north-east. Features of geological composition and ridge relief morphology allowed to reveal regularities in plane location of some glacial forms as ridges rows. These rows corresponded to several oscillations of active ice front with slight reduction of the ice cover. Thus on the north of the Kola Peninsula there was a periodic alternation of areal and frontal deglaciations.