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- W2076552175 abstract "Abstract An event chronology has been determined for temporal and lateral magnitudes of material fluxes across the northern North Sea Margin, including the Norwegian Channel and the North Sea Fan. This has allowed the governing factors for the sediment processes on the margin to be estimated. The chronological model of selected cores is based on 14 C AMS dates, regional tephra layers and planktonic foraminiferal stratigraphy. Based on this chronological framework the core sediments across the North Sea Margin have been divided into four main climatostratigraphic intervals: (a) Oldest Dryas (15–13 ka); (b) Bolling–Allerod (13–11 ka); (c) Younger Dryas (11–10 ka); and (d) Holocene (10–0 ka). Further, the Holocene period has also been divided into two subperiods, the Preboreal (10–9 ka) and the Holocene interglacial (9–0 ka), creating five well-defined lithological units (deposition phases), in all of which the deglaciation units (15–9 ka) usually constitute 90% of the sediment budget. The recognition of an almost identical lithological succession both in the records on the fan and in the high-resolution record of the channel suggests that sedimentation on the North Sea Margin must be governed dominantly by regional sedimentary processes. For each time interval the sedimentation rate in the Norwegian Channel is, on average, an order of magnitude higher than on the North Sea Fan diminishing distally from the shelf edge. Sedimentation under the Holocene interglacial period (9–0 ka) contrasts totally from the deglaciation pattern, controlled dominantly by pelagic productivity in the area. Close to 50% of the hemipelagic sediments on the North Sea Margin are of Bolling–Allerod age (15–13 ka). This extreme sedimentation resulted from a combination of a rapid sea-level rise, constantly exposing new areas for marine erosion/winnowing, and aggressive surface ocean current activity. Surface ocean currents and the associated bottom currents provide the dominant control on the pattern of deglacial sedimentation on the North Sea Margin (15–9 ka). This is especially apparent during the Oldest Dryas and the Bolling–Allerod periods where the distribution pattern across the margin is essentially hydrodynamically controlled. Only during the Younger Dryas period are the surface ocean processes overprinted by sedimentary processes from melting icebergs. The high-resolution records reveal that the shifts in the lithological style of sedimentation are directly linked to the rapid reorganisation of the surface ocean system frequently taking place during the deglacial and Holocene time period, suggesting a fairly regional type of sedimentation pattern. As the shift between the different lithological styles of sediments is both abrupt and regional, they should be detectable on the seismic high-frequency records." @default.
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- W2076552175 date "1998-11-01" @default.
- W2076552175 modified "2023-09-25" @default.
- W2076552175 title "Late Weichselian and Holocene sediment fluxes of the northern North Sea Margin" @default.
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- W2076552175 doi "https://doi.org/10.1016/s0025-3227(98)00071-1" @default.
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