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- W2045100596 abstract "Glacial mélange in the open-cast mine at Amsdorf, central Germany, consists of several square meters of large, sorted sediment blocks embedded in till. The blocks are composed of largely intact to slightly deformed glaciofluvial and glaciolacustrine sand, silt and clay, initially deposited in a proglacial lake (2–3 km up-ice) and subsequently overridden by a glacier. The blocks typically have cuboid to subrounded outlines, are randomly distributed in the till, and the contacts with the surrounding till are distinctly sharp. Underneath the mélange are varved clays which exhibit strong deformations occasionally intervening with entirely undisturbed areas. It is suggested that the blocks were entrained into debris-rich basal-ice by bulk freeze-on when the glacier sole was lowered onto the bottom of an overridden lake. After entrainment the blocks were transported englacially and re-deposited (with far-traveled till matrix) as a melt-out till from stagnant ice. The glacier moved mainly by sliding enhanced by low-permeability varved clays in the substratum. The glacier is believed to have been of a polythermal type. These results show that bulk freeze-on can lead to entrainment of soft sediment blocks at least 20 m2 in size, and that these blocks can be englacially transported with little or no deformation for several kilometers and more. The occurrence of deformed and undeformed clays under the till mélange indicates a possible mosaic of coupled and decoupled ice, the latter caused by a thin, transient subglacial water film separating the bed from the glacier." @default.
- W2045100596 created "2016-06-24" @default.
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- W2045100596 date "2001-04-01" @default.
- W2045100596 modified "2023-10-16" @default.
- W2045100596 title "Till mélange at Amsdorf, central Germany: sediment erosion, transport and deposition in a complex, soft-bedded subglacial system" @default.
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- W2045100596 doi "https://doi.org/10.1016/s0037-0738(00)00184-6" @default.
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