Dislocated Quaternary deposits in southeastern Kattegat – a glacial or gravitational phenomenon?

Thomas Vangkilde-Pedersen, Holger Lykke-Andersen, Gustaf Lind

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

Abstract

The Quaternary deposits in the Store Middelgrund–Rørdebanke area midway between the island of Anholt and Hallandsåsen on the Swedish coast are described on the basis of reflection seismic profiles with a vertical resolution of 5–10 m. The Quaternary rests on Upper Cretaceous limestone, the surface of which is nearly horizontal. Three Quaternary sequences are defined and interpreted as: (1) Late Weichselian marine or lacustrine deposits, (2) Late Weichselian glaciogenic deposits, and (3) Late Saalian–Eemian and Early–Middle Weichselian deposits. Sequence 3 is probably comparable to the upwards‐coarsening sequence known from Skaerumhede in Vendsyssel. The layers in sequence 3 are dislocated in the eastern part of the Store Middelgrund–Rødebanke area mainly by gentle folding, but other types of deformations occur. Folding could be the result of horizontal push from an ice sheet approaching from the east. Alternatively the folding is an effect of vertical, gravitational forces acting on the sediments due to an unstable density profile, as described by the Rayleigh–Taylor instability model. The zone of deformation is located close to the northern flank of the tectonically active Sorgenfrei–Tornquist Zone. It is suggested that the initiation of the folding process was facilitated by tremors from small earthquakes.

Original languageEnglish
Pages (from-to)329-336
Number of pages8
JournalBoreas
Volume22
Issue number4
DOIs
Publication statusPublished - Dec 1993
Externally publishedYes

Programme Area

  • Programme Area 5: Nature and Climate

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