Sedimentological and Stratigraphical Studies of Two Cores from the Skagerrak

  1. S.-D. Nio,
  2. R. T. E. Shüttenhelm and
  3. Tj. C. E. Van Weering
  1. Per Jørgensen1,
  2. Helmut Erlenkeuser2,
  3. Heinz Lange3,
  4. Jenø Nagy1,
  5. Jan Rumohr3 and
  6. Friedrich Werner3

Published Online: 29 JUN 2009

DOI: 10.1002/9781444303759.ch28

Holocene Marine Sedimentation in the North Sea Basin

Holocene Marine Sedimentation in the North Sea Basin

How to Cite

Jørgensen, P., Erlenkeuser, H., Lange, H., Nagy, J., Rumohr, J. and Werner, F. (2009) Sedimentological and Stratigraphical Studies of Two Cores from the Skagerrak, in Holocene Marine Sedimentation in the North Sea Basin (eds S.-D. Nio, R. T. E. Shüttenhelm and Tj. C. E. Van Weering), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444303759.ch28

Author Information

  1. 1

    Department of Geology, University of Oslo, Norway

  2. 2

    C-14 Laboratory, Physicscenter, University of Kiel, Germany

  3. 3

    Geological-Paleontological Institute, University of Kiel, Germany

  1. Publication No. 272 of the ‘Joint Research Programme’, Kiel University (Sonderforschungsbereich 95 der Deutschen Forschungsgemeinschaft).

Publication History

  1. Published Online: 29 JUN 2009
  2. Published Print: 23 DEC 1981

ISBN Information

Print ISBN: 9780632008582

Online ISBN: 9781444303759

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Keywords:

  • monotonous distribution of sediment parameters;
  • relics of primary bedding structures;
  • occurrence of types of bedding (flaser-lenticular) and biogenic structures;
  • horizontal rhythmic parallel lamination;
  • wavy-lenticular fiaser bedding

Summary

Two cores from the southern side of the Norwegian Channel from water depths of 239 and 454 m have been studied with respect to geotechnical properties, texture, sedimentary structures, mineralogical composition and stratigraphy. The core from a water depth of 454 m showed a rather sudden increase in shear strength at a depth of around 250 cm, without any corresponding decrease in water content. Since the properties of remoulded samples are almost identical throughout the core and the composition (grain-size distribution and mineralogy) is constant as well, the increased shear strength is attributed to diagenesis. In the core from 239 m depth, the sand content gradually increases with decreasing age. This coarsening upwards is in agreement with the occurrence of a bedload indicated by flaser bedding. It is explained as a gradual increase in bed load/suspension load ratio in these shelf sediments. Besides these and a few other relics of primary bedding structures, the sediments in both cores appear as completely bioturbated. The biogenic structures can be grouped into a few associations of ichnological forms. This may be useful as environmental characteristics in otherwise rather monotonous distribution of sediment parameters.

The foraminiferal assemblages found in the two cores are composed mainly of species with boreoarctic, boreal, and boreo-lusitanian recent distribution. Consequently, the cores in their entirety are referred to the Flandrian. They show marked differences in the quantitative distribution of several species; which is explained by environmental differences at the two stations, having a depth difference of 215 m. A tentative correlation of these two cores is made with an earlier described core from the Skagerrak.