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    Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10259/6103

    Título
    Abrupt last glacial dust fall over southeast England associated with dynamics of the British-Irish ice sheet
    Autor
    Stevens, Thomas
    Sechi, Daniele
    Bradák, BalázsAutoridad UBU Orcid
    Orbe, Ragna
    Baykal, Yunus
    Cossu, Giulia
    Tziavaras, Charilaos
    Andreucci, Stefano
    Pascucci, Vincenzo
    Publicado en
    Quaternary Science Reviews. 2020, V. 250, 106641
    Editorial
    Elsevier
    Fecha de publicación
    2020-12
    ISSN
    0277-3791
    DOI
    10.1016/j.quascirev.2020.106641
    Resumen
    Loess deposits in southern Britain contain a record of dust, climate and landscape dynamics over the last glacial, yet their age and accumulation rate remain poorly known. Furthermore, the environmental controls on the loess-soil stratigraphy shown in the thickest deposits in southeast England are still debated. Here we apply the first high sampling resolution quartz optically stimulated luminescence study of dust accumulation and loess formation in Britain at the Pegwell Bay site in east Kent. We couple this to mineral magnetic, particle size and geochemical analyses to understand climate, environment and post depositional modification of the loess. The luminescence ages and Bayesian age modelling results suggest two phases of greatly enhanced dust accumulation at the site. Loess began to accumulate around c. 25e23.5 ka, coinciding with Heinrich event 2, and after subsequent lower accumulation rates, a second enhanced phase of deposition occurred at around 20e19 ka.We propose a model where the dynamics of the British-Irish and Fennoscandian Ice Sheets, associated glacial lake drainage, and linked reorganisations of atmospheric circulation, all controlled loess accumulation in southern Britain. Accumulation in the first phase was triggered by increased sediment supply from initial retreat of the North Sea ice lobe, and drainage of Dogger Lake. Loess accumulation during this phase was enhanced by easterly winds from Atlantic depressions tracking to the south of Britain, caused by the maximum extent of the Irish Sea Ice Stream at c. 25e24 ka. The subsequent retreat of the western part of the British Irish Ice Sheet then allowed storm tracking further north, which reduced effectiveness of dust transporting winds across southern Britain, while sediment supply and availability was reduced in North Sea source areas. A second retreat of the maximum extent of the North Sea Lobe of ice after c. 21e20 ka would have led to another abrupt input of sediment-rich ice dammed lake and meltwater from eastern England and the North Sea into the exposed southern North Sea area. This would have again dramatically increased sediment availability for transport and deposition as loess in SE England, resulting in the second dust accumulation phase. We also propose that the abrupt stratigraphic change from calcareous to non-calcareous loess up section at Pegwell Bay was driven, not by these changes in dust input, but rather deepening of the permafrost active layer after c. 21 ka. This deepening was associated with warmer and wetter conditions driven by Atlantic storms tracking further north following the regression of the Irish Sea Ice Stream and overall ice sheet retreat. As such, last glacial dust dynamics and loess accumulation in Britain is highly influenced by the interaction of the British Irish Ice Sheet the Fennoscandian Ice sheet, Atlantic storm tracks, and the topography and drainage of the exposed North Sea.
    Palabras clave
    Loess
    Pegwell bay
    Luminescence
    Multi-proxy
    Brickearth
    Palaeoenvironment
    Materia
    Física
    Physics
    Ciencias medioambientales
    Environmental sciences
    Geología
    Geology
    URI
    http://hdl.handle.net/10259/6103
    Versión del editor
    https://doi.org/10.1016/j.quascirev.2020.106641
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    • Artículos PALEOMAG-UBU
    Atribución 4.0 Internacional
    Documento(s) sujeto(s) a una licencia Creative Commons Atribución 4.0 Internacional
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    Nombre:
    Stevens-qsr_2020.pdf
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