Abstract
Abstract A number of processes have been suggested by glaciologists and Quaternary geologists to explain the type of glacial erosion named plucking. These presume that hydraulic jacking, frost-induced wedging or temperature variations in one way or another have loosened joint blocks from the bedrock surface and evacuated and entrained these in the ice. Large mounds of huge angular boulders and caves therein, have been ascribed to splitting by sudden stress release related to neotectonic activity in postglacial time. This paper presents a hypothesis which relates glacial plucking and split bedrock surfaces to violent venting of methane released during isostatic rebound from methane hydrate formed under permafrost and continental ice.
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