1887
25th International Conference and Exhibition – Interpreting the Past, Discovering the Future
  • ISSN: 2202-0586
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Abstract

Buried tunnel valleys are elongated depressions eroded into the substratum during the Pleistocene glaciations. Nine such valleys are mapped on- and offshore in a 300 km2 area located at the Danish North Sea coast. The delineation of the buried valleys is based on an extensive data set consisting of on- and offshore 2D seismic data, TEM (Transient Electro-Magnetic) soundings, Schlumberger soundings, and boreholes. The valleys are observed as discrete incisions with three overall orientations: SSE - NNW, ESE - WNW, and SSW - NNE. They have depths between 75 and 185 m, widths up to 1.8 km, and lengths from 7 to 25 km. The infill comprises till, glaciofluvial sand, and glaciolacustrine clay and silt. Younger tunnel valleys are found to often re-use pre-established valleys generating cut-and-fill structures which are clearly revealed on the reflection seismic profiles. Cross-cutting relations, preferred orientations, and morphology support that three of the tunnel valleys cross the North Sea coastline. It is suggested that the nine valleys were formed during at least six events that occurred through one or more pre-Weichselian glaciations.

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2016-12-01
2026-01-19

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References

  1. Andersen, T.R., Huuse, M., Jergensen, F., and Christensen, S., 2012, Seismic investigations of buried tunnel valleys on- and offshore Denmark. Geological Society, London, Special Publications, 368
  2. Auken, E., Jergensen, F. and Serensen, K.I., 2003, Large-scale TEM investigation for groundwater. Exploration Geophysics 34, 188194.
  3. Cameron, T.D.J., Stoker, M.S. and Long, D., 1987, The history of Quaternary sedimentation in the UK sector of the North Sea Basin. Journal of the Geological Society, London 144, 43-58.
  4. Carr, S.J., Holmes, R., van der Meer, J.J.M. and Rose, J., 2006, The Last Glacial Maximun in The North Sea Basin: micromorphological evidence of extensive glaciation. Journal of Quaternary Sciences 21, 131-153.
  5. Christensen, N.B. and Serensen, K.I., 1998, Surface and borehole electric and electromagnetic methods for hydrogeological investigations. European journal of environmental and engineering geophysics 3, 75-90.
  6. Danielsen, J.E., Auken, E., Jergensen, F., Sendergaard, V., and Serensen, K.I., 2003, The application of the transient electromagnetic method in hydrogeophysical surveys. Journal of Applied Geophysics 53, 181-198.
  7. Efferse, F., Auken, E. and Serensen, K.I., 1999, Inversion of band-limited TEM responses. Geophysical Prospecting 47, 551-564.
  8. Ehlers, J., 1990, Reconstructing the dynamics of the north-west European Pleistocene ice sheets. Quaternary Science Reviews 9, 7183.
  9. Houmark-Nielsen, M., 1987, Pleistocene stratigraphy and glacial history of the central part of Denmark. Bulletin of the Geological Society of Denmark 36, 1-189.
  10. Huuse, M. and Lykke-Andersen, H., 2000, Overdeepened Quaternary valleys in the eastern Danish North Sea: morphology and origin. Quaternary Science Reviews 19, 1233-1253.
  11. Heyer, A.S., Jergensen, F., Sandersen, P.B.E., Viezzoli, A. and Meller, I., 2015, 3D geological modelling of a complex buried-valley network delineated from borehole and AEM data. Journal of Applied Geophysics 122, 94-102.
  12. Jergensen, F., Sandersen, P.B.E. and Auken, E., 2003a, Imaging buried Quaternary valleys using the transient electromagnetic method. Journal of Applied Geophysics 53, 199-213.
  13. Jergensen, F., Lykke-Andersen, H., Sandersen, P.B.E., Auken, E. and Nermark, E., 2003b, Geophysical investigations of buried Quaternary valleys in Denmark: an integrated application of transient electromagnetic soundings, reflection seismic surveys and exploratory drillings. Journal of Applied Geophysics 53, 215-228.
  14. Jergensen, F., Sandersen, P.B.E., Auken, E., Lykke-Andersen, H. and Serensen, K., 2005, Contributions to the geological mapping of Mors, Denmark - a study based on a large-scale TEM survey. Bulletin of the Geological Society of Denmark 52, 53-75.
  15. Jergensen, F. and Sandersen, P.B.E., 2006, Buried and open tunnel valleys in Denmark - erosion beneath multiple ice sheets. Quaternary Science Reviews 25, 1339-1363.
  16. Jergensen, F. and Sandersen, P., 2009. Kortlasgning af begravede dale i Denmark. Opdatering 2007-2009. Geological Survey of Denmark and Greenland, GEUS. Special Publication. ISBN 978-87-7871-259-2, 354 pp. (In Danish).
  17. Kehew, A.E., Piotrowski, J.A., and Jergensen, F., 2012, Tunnel Valleys: Concepts and controversies - A review: Earth Science Reviews, 113, 33-58.
  18. Kluiving, S.J., Aleid Bosch, J.H., Ebbing, J.H.J., Mesdag, C.S. and Westerhoff, R.S. 2003, Onshore and offshore seismic and lithostratigraphic analysis of a deeply incised Quaternary buried valley-system in the Northern Netherlands. Journal of Applied Geophysics 53, 249-271.
  19. Kristensen, T.B., Huuse, M., Piotrowski, J.A. and Clausen, O.R. 2007, A morphometric analysis of tunnel valleys in the eastern North Sea based on 3D seismic data. Journal of Quaternary Science 22, 801-815.
  20. Nielsen, O.B., Serensen, S., Thiede, J. and Skarbe, O. 1986, Cenozoic Differential Subsidence of North Sea. American Association of Petroleum Geologists Bulletin 70, 276-298.
  21. O Cofaigh, C., 1996, Tunnel valley genesis. Progress in Physical Geography 21, 1-19.
  22. Praeg, D., 2003, Seismic imaging of mid-Pleistocene tunnel-valleys in the North Sea Basin - high resolution from low frequencies. Journal of Applied Geophysics 53, 273-298.
  23. Rambell, 2006, Seismisk kortlasgning i Ringkebing Amt 2006. (In Danish).
  24. Rasmussen, E.S., Dybkjasr, K., Piasecki, S., 2010, Lithostratigraphy of the Upper Oligocene - Miocene succession of Denmark. GEUS, 2010.
  25. Sandersen, P.B.E. and Jergensen, F., 2003, Buried Quaternary valleys in western Denmark - occurrence and inferred implications for groundwater resources and vulnerability. Journal of Applied Geophysics 53, 229-248.
  26. Shackleton, N.J. 1987, Oxygen Isotopes, Ice volume and sea level. Quaternary Science Reviews 6, 183-190. Spies, B.R. 1989, Depth of investigation in electromagnetic sounding methods. Geophysics 54, 872-888.
  27. West, G.F. and MacNae, J.C. 1991, Physics of the electromagnetic induction exploration method. In: Nabighian, M.N. & Corbett, J.D. (eds.) Electromagnetic methods in applied geophysics. Investigations in geophysics 2, 5-45.
  28. Wingfield, R. 1990, The origin of major incisions within the Pleistocene deposits of the North Sea. Marine Geology 91, 31-52.
  29. Wright, H.E., 1973, Tunnel valleys, glacial surges and subglacial hydrology of the superior Lobe, Minnesota. In Black, R.F., Goldthwaite, R.P. and Willman, H.B., editors, The Wisconsinan stage. Memoir 136, Boulder, Co. Geological Society of America 136, 251-276.
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  • Article Type: Research Article
Keyword(s): 3D geological models; geophysical mapping; Pleistocene valleys; reflection seismic data

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