Coastal lagoons and beach ridges as complementary sedimentary archives for the reconstruction of Holocene relative sea‐level changes |
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| Authors: | Lasse Sander Mikkel U Hede Mikkel Fruergaard Lars Nielsen Lars B Clemmensen Aart Kroon Peter N Johannessen Lars H Nielsen Morten Pejrup |
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| Affiliation: | 1. Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Copenhagen K, Denmark;2. Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen K, Denmark;3. Laboratoire Morphodynamique Continental et C?tière, University of Caen Lower Normandy, UMR CNRS 6143, Caen, France |
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| Abstract: | Coastal lagoons and beach ridges are genetically independent, though non‐continuous, sedimentary archives. We here combine the results from two recently published studies in order to produce an 8000‐year‐long record of Holocene relative sea‐level changes on the island of Samsø, southern Kattegat, Denmark. The reconstruction of the initial mid‐Holocene sea‐level rise is based on the sedimentary infill from topography‐confined coastal lagoons (Sander et al., Boreas, 2015b). Sea‐level index points over the mid‐ to late Holocene period of sea‐level stability and fall are retrieved from the internal structures of a wide beach‐ridge system (Hede et al., The Holocene, 2015). Data from sediment coring, georadar and absolute dating are thus combined in an inter‐disciplinary approach that is highly reproducible in micro‐tidal environments characterised by high sediment supply. We show here that the commonly proximate occurrence of coastal lagoons and beach ridges allows us to produce seamless time series of relative sea‐level changes from field sites in SW Scandinavia and in similar coastal environments. |
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