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Interaction between bottom currents and slope failure in the Late Cretaceous of the southern Danish Central Graben, North Sea

E.V. ESMERODE, H. LYKKE-ANDERSEN and F. SURLYK
Journal of the Geological Society, 165, 55-72, 14 January 2008, https://doi.org/10.1144/0016-76492006-138
E.V. ESMERODE
1DONG Energy E&P, Agern Allé 24–26, DK-2970 Hørsholm, Denmark (e-mail: )
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H. LYKKE-ANDERSEN
2Department of Earth Sciences, University of Aarhus, Høegh Guldbergs Gade 2, DK-8000 Århus C, Denmark
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F. SURLYK
3Department of Geography and Geology, Geology Section, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
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Abstract

The NW European Chalk Group was deposited in a deep epicontinental sea traditionally conceived as a quiet depositional setting that was only affected by redeposition along structural highs. The ‘chalk sea’ was, however, locally affected by powerful bottom currents during some periods. Three-dimensional seismic reflection data from the southern Central Graben show abundant intra-chalk morphological elements concentrated at two stratigraphic levels within the Turonian–Campanian sequence. Both levels are topped by extensive unconformities. The geometry of the elements produced by alongslope processes is interpreted as caused by SE-directed bottom currents flowing between the Bo-Jens and Adda ridges. The highest current intensities led to the formation of the two unconformities, judged by the occurrence of the largest current-formed channels and drifts at these two stratigraphic levels. This sea-floor topography was locally modified by large-scale downslope mass transport. Stratigraphical coincidence of the largest slumps and bottom-current erosion suggests a coupling between downslope and alongslope processes. Current erosion impinged upon the slopes during periods of highest current speeds, destabilizing the slope sediments and triggering slumping. The smoothing of the bathymetry following local relaxation of the tectonic inversion accounted for the coeval deactivation of alongslope and downslope processes during the succeeding Maastrichtian deposition.

  • © 2008 The Geological Society of London
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Journal of the Geological Society: 165 (1)
Journal of the Geological Society
Volume 165, Issue 1
January 2008
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Interaction between bottom currents and slope failure in the Late Cretaceous of the southern Danish Central Graben, North Sea

E.V. ESMERODE, H. LYKKE-ANDERSEN and F. SURLYK
Journal of the Geological Society, 165, 55-72, 14 January 2008, https://doi.org/10.1144/0016-76492006-138
E.V. ESMERODE
1DONG Energy E&P, Agern Allé 24–26, DK-2970 Hørsholm, Denmark (e-mail: )
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
H. LYKKE-ANDERSEN
2Department of Earth Sciences, University of Aarhus, Høegh Guldbergs Gade 2, DK-8000 Århus C, Denmark
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  • Find this author on PubMed
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F. SURLYK
3Department of Geography and Geology, Geology Section, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
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  • Find this author on PubMed
  • Search for this author on this site

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Interaction between bottom currents and slope failure in the Late Cretaceous of the southern Danish Central Graben, North Sea

E.V. ESMERODE, H. LYKKE-ANDERSEN and F. SURLYK
Journal of the Geological Society, 165, 55-72, 14 January 2008, https://doi.org/10.1144/0016-76492006-138
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