Sedimentary Facies of Shoreface-Connected Sand Ridges off the East Frisian Barrier-Island Coast, Southern North Sea: Climatic Controls and Preservation Potential

  1. Michael Z. Li4,
  2. Christopher R. Sherwood5 and
  3. Philip R. Hill6
  1. Chang Soo Son1,
  2. Burghard W. Flemming2 and
  3. Tae Soo Chang3

Published Online: 3 JAN 2013

DOI: 10.1002/9781118311172.ch7

Sediments, Morphology and Sedimentary Processes on Continental Shelves: Advances in Technologies, Research, and Applications

Sediments, Morphology and Sedimentary Processes on Continental Shelves: Advances in Technologies, Research, and Applications

How to Cite

Son, C. S., Flemming, B. W. and Chang, T. S. (2012) Sedimentary Facies of Shoreface-Connected Sand Ridges off the East Frisian Barrier-Island Coast, Southern North Sea: Climatic Controls and Preservation Potential, in Sediments, Morphology and Sedimentary Processes on Continental Shelves: Advances in Technologies, Research, and Applications (eds M. Z. Li, C. R. Sherwood and P. R. Hill), John Wiley & Sons, Ltd, Chichester, West Sussex, UK. doi: 10.1002/9781118311172.ch7

Editor Information

  1. 4

    Geological Survey of Canada (Atlantic), Natural Resources Canada, Bedford Institute of Oceanography, Dartmouth, Nova Scotia, B2Y 4A2 Canada

  2. 5

    U. S. Geological Survey, Woods Hole, MA 02543-1598 USA

  3. 6

    Natural Resources Canada, Sidney, BC, Canada V8L 4B2

Author Information

  1. 1

    Faculty of Earth System & Environmental Sciences, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 500-757, Korea

  2. 2

    Senckenberg Institute, Suedstrand 40, 26382 Wilhelmshaven, Germany

  3. 3

    Petroleum & Marine Research Division, Korea Institute of Geoscience & Mineral Resources, 305-350 Daejeon, Korea

Publication History

  1. Published Online: 3 JAN 2013
  2. Published Print: 26 JAN 2012

ISBN Information

Print ISBN: 9781444350821

Online ISBN: 9781118311172

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Keywords:

  • shoreface-connected ridge;
  • storm;
  • preservation potential;
  • effective wave base

Summary

The sedimentary facies characterizing the shoreface-connected ridges off the East Frisian barrier-island coast, southern North Sea, were analyzed by means of high-resolution multi-beam bathymetry, sediment characteristics, and internal sedimentary structures derived from vibracores and box-cores. Particular attention was given to the contrasting sedimentary characteristics associated with seasonal storm and calm-weather situations, and how this was reflected in the preservation potential of the respective deposits. The internal sedimentary structures of the ridges are clearly related to the local wave climate and tidal regime. Under calm-weather conditions (summer months), partly bioturbated ripple cross-laminated sands dominate the deposits. In addition, tide-generated features such as small dune cross-stratification, herring-bone crossbeds, and flaser structures can be recognized. Particularly on the inner ridges, most of the physical structures in the upper sediment layer are strongly bioturbated by burrowing sea urchins (Echinocardium cordatum) and polychaete worms such as Lanice conchilega and Arenicola marina, whereas towards the outer ridges, the rate of bioturbation decreases rapidly, bi-directional large-scale crossbeds and climbing-ripple crossbeds being the dominant sedimentary structures. However, during the storm period (autumn — spring) most of these structures are replaced by hummocky cross-stratifications, low-angle laminations, and upper-flow-regime plane beds indicative of storm events. According to vibracore data, most of the preserved down-core sedimentary structures reflect storm influence, although a few structures possibly relate to fair-weather conditions, e.g. occasionally preserved bioturbated beds and ripple crossbedding. This may be due to a change in the effective wave-base in response to changing weather conditions during the waning storm phase rather than to a prolonged fair-weather period. Modern facies models based solely on short box-cores must be applied with great caution to the interpretation of the rock record.