Journal
FACIES
Volume 52, Issue 3, Pages 329-340Publisher
SPRINGER
DOI: 10.1007/s10347-006-0080-2
Keywords
holocene; stratigraphy; transgression; Facies analysis; back-barrier tidal deposit; preservation potential; East Frisian Wadden Sea
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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 vibracores and box-cores were evaluated, complemented by C-14 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 modem 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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