Late Holocene stratigraphic evolution of a back-barrier tidal basin in the East Frisian Wadden Sea, southern North Sea: transgressive deposition and its preservation potential |
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Authors: | Tae Soo Chang Burghard W. Flemming Elke Tilch Alexander Bartholomä Ralf Wöstmann |
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Affiliation: | (1) Senckenberg Institute, Südstrand 40, 26382 Wilhelmshaven, Germany;(2) Terramare Research Centre, Schleusenstrasse 1, 26382 Wilhelmshaven, Germany |
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Abstract: | The late Holocene stratigraphic evolution of a back-barrier tidal basin in the East Frisian Wadden Sea, southern North Sea, was investigated on the basis of a conceptual model relating the rate of sea-level rise to the rate of sediment supply. For this purpose, more than 20 vibra-cores and box-cores were evaluated, complemented by 14C ages of in situ peats and historical charts. In spite of interspersed short regressive events, the late Holocene stratigraphy generally reveals upward-coarsening grain-size trends indicative of transgressive deposition in the course of sea-level rise rather than erosion and redeposition by migrating channels. A particular feature is the general absence of down-core bioturbation traces, which stands out in sharp contrast to the intensely burrowed modern surface layer. Thus, in the Wadden Sea, high sediment turnover in the course of rapid transgression evidently obliterates most bioturbation traces and other tidal signals such as minor regressive deposits, thereby emphasising the importance of preservation potential. |
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Keywords: | Holocene Stratigraphy Transgression Facies analysis Back-barrier tidal deposit Preservation potential East Frisian Wadden Sea |
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