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Holocene sea-level variation and spit development: data from Skagen Odde, Denmark

Niels Richardt

Christian Andersen

Geological Institute, University of Copenhagen, 0ster Voldgade 10, DK-1350 Copenhagen K, Denmark

Extensivxe exposures of peat located in initer-ridge swales, at the contact between beach anid oxerlyiing coastal dune deposits at Skagen Odde. northern Denmark, provide a record of spit development in relation to glacioisostatic rebound and sea-level variation. The elevationi of the base of the swale peats was measured over a distanlce of l5 kmni anid rcpresenits spit gosowth bet-Necen '6000 and 1400 cal. veairs BP. Tlle swale pealts fall from 13-14 m a.s.l. in the south (proximiial part) to 3-4 m a.s.l. in the north (distal part) reflecting the inifluenice of 'ostatic rebounid diting spit gTowsth. The nesw data suggest that isostatic rebound progressively declined with time fromi c. 3 mm yr' to c. 1.5 mm yr'. Superimposed on the isostatic controlled changes are smaller-scale fluctations in peat elevation related to eustatic sea-level changes. Sea-level higlhstands ae iden1 t ified at 5450 (+2.7 in). 4700 (+1.7 m) and 2450 cal. years BP (+0.4 m). anid lowstands at 5200 (+1.5 m). 4100 (-1.9 mn) anid 1650i cal. years B3 (40.6 m). A final comilponiient th at contributes to variatiotis in peat lexattion is local topoarcapiv and at a few places pcat drapes across stiaal icoli clidns. Tlin agc nilO indicates eat the spit-groxthi tiate varied betwveen 2 anid moi-e tlhani 10 mi sr-'. Thlse variations in growtlh rate may patily t-ecord sea level controlled fluctationis in the supply of sanid fromi erodini;g clifts onl the west coast of niorthern Juitlarid.

Key Words: Sea-level variation • isostasy • spit clevelopinent • ridge-anid-swale comiplex • Deniltark • Holoceite

The Holocene, Vol. 11, No. 3, 323-331 (2001)
DOI: 10.1191/095968301667877044


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