Features peculiar to marginal ridges formation of the Late Valdai ice sheet under conditions of arctic climate

Abstract

When the Late Valdai ice sheet receded within Arctic regions, the heat supply appeared insufficient to ensure an active retreat of the ice margin. As shown using the Kola Peninsula as a case study, such conditions resulted in marginal belts formation consisting of two ridges. The inner ridge developed under condition of stationary ice margine, while the younger outer ridge was built by reactivated ice sheet. After an episode of reactivation, the peripherical parts of the ice sheet lost their connection with the main ice body and melted as dead ice blocks.