Zoeken
Zoeken kan via de modus 'eenvoudig zoeken' (één veld) of uitgebreid via 'geavanceerd zoeken' (meerdere velden). Zo kan je bv. zoeken op een combinatie van een auteursnaam (auteur), een jaartal (jaar) en een documenttype.
Boekenmand
Nuttige resultaten kan je aanvinken en toevoegen aan een mandje. De inhoud hiervan kan je exporteren of afdrukken (naar bv. PDF).
RSS
Op de hoogte blijven van nieuw toegevoegde publicaties binnen uw interessegebied? Dit kan door een RSS-feed (?) te maken van jouw zoekopdracht.
nieuwe zoekopdracht
Left high and dry: deglaciation of Dogger Bank, North Sea, recorded in proglacial lake evolution
Emery, A.R.; Hodgson, D.M.; Barlow, N.L.M.; Carrivick, J.L.; Cotterill, C.J.; Phillips, E. (2019). Left high and dry: deglaciation of Dogger Bank, North Sea, recorded in proglacial lake evolution. Front. Earth Sci. 7: 234. https://dx.doi.org/10.3389/feart.2019.00234
In: Frontiers in Earth Science. Frontiers Media SA: Lausanne. ISSN 2296-6463; e-ISSN 2296-6463, meer
|  |
| Trefwoord |
|
| Author keywords |
North Sea, ice stream, proglacial lake, British-Irish Ice Sheet, glacial geomorphology, glacial stratigraphy, shallow seismic, Quaternary |
| Auteurs | | Top |
- Emery, A.R.
- Hodgson, D.M.
- Barlow, N.L.M.
|
- Carrivick, J.L.
- Cotterill, C.J.
- Phillips, E.
|
|
| Abstract |
Reconstructions of palaeo-ice sheet retreat in response to climate warming using offshore archives can provide vital analogs for future ice-sheet behavior. At the Last Glacial Maximum, Dogger Bank, in the southern North Sea, was covered by the EurasianIce Sheet. However, the maximum extent and behavior of the ice sheet in the North Sea basin is poorly constrained. We reveal ice-marginal dynamics and maximum ice extent at Dogger Bank through sedimentological and stratigraphic investigation of glacial andproglacial lake sediments. We use a large, integrated subsurface dataset of shallow seismic reflection and geotechnical data collected during windfarm site investigation. For the first time, an ice stream is identified at Dogger Bank, based on preserved subglacial bedforms, eskers and meltwater channels. During ice-sheet advance, a terminal thrustblock moraine complex formed, whose crest runs approximately north-northeast to south-southwest. Subsequent ice stream shutdown caused stagnation of ice, andrapid retreat of the ice-sheet margin. The moraine complex, and outwash head from an adjacent ice-sheet lobe to the west, dammed a large (approximately 750 km2) proglacial lake. Subsequent sedimentation infilled the lake with 30 m of glacial outwashsediments. A lobate subaqueous fan formed at the ice-sheet margin, which thins toward the southeast with iceberg scours and ice-rafted debris at the base, and is onlapped by lake sediments calibrated to core as alternating clay and silt laminae, interpreted to be varves. The lake became isolated from the retreating ice-sheet margin, and ice-sheet retreat slowed. Sediment-laden meltwater was supplied to the ice-distal proglacial lake for c. 1500–2000 years. Subsequent ice-sheet retreat off Dogger Bank was more rapid due to the negative subglacial slope. The stepped retreat of rapid downwasting, slow retreat, and a final rapid phase off Dogger Bank occurred after the LGM at around 27 ka and before formation of a ribbon lake, dated previously to 23 ka and approximately 60 m lower in elevation, formed to the north of Dogger Bank. The complicated stratigraphic architecture revealed through these data improves forecasting of ground conditionsfor turbine footings at Dogger Bank, an important step in the provision of clean,sustainable energy. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
