A Late Pleistocene channelized subglacial meltwater system on the Atlantic continental shelf south of Ireland
نویسندگان
چکیده
The study of palaeo-glacial landforms and sediments can give insights into the nature dynamics ice sheets. This is particularly case with regards to subglacial record, which challenging observe in contemporary glaciated settings hence remains only partially understood. hydrological system an essential component dynamics, where increased water pressure enhances motion sediment deformation, thus reducing ice-bed contact. Tunnel valleys are large, sinuous, steep-sided incisions that, together smaller scale meltwater channels, indicate discharge beneath large Through use high-resolution marine geophysical data, a buried exposed tunnel valleys, possible or proglacial channels palaeo-fluvial have been identified across shelf Celtic Sea between Ireland Britain. presence overdeepened indicative channelized drainage former Irish Ice Stream, most extensive stream drain last British–Irish Sheet. After rapid expansion around 28–26 ka, were carved both bedrock glacigenic associated retreat northwards Basin 25.6 24.3 ka. major on relatively shallow suggests that significant erosive occurred during deglaciation highlights important contribution Sheet continental shelf.
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ژورنال
عنوان ژورنال: Boreas
سال: 2021
ISSN: ['0300-9483', '1502-3885']
DOI: https://doi.org/10.1111/bor.12536