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Architecture and long term evolution of a tidal sandbank: the Middelkerke Bank (southern North Sea)
Berné, S.; Trentesaux, A.; Stolk, A.; Missiaen, T.; De Batist, M. (1994). Architecture and long term evolution of a tidal sandbank: the Middelkerke Bank (southern North Sea). Mar. Geol. 121(1-2): 57-72. http://dx.doi.org/10.1016/0025-3227(94)90156-2
In: Marine Geology. Elsevier: Amsterdam. ISSN 0025-3227; e-ISSN 1872-6151
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| Auteurs | | Top |
- Berné, S.
- Trentesaux, A.
- Stolk, A.
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- Missiaen, T.
- De Batist, M.
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| Abstract |
The internal structure of the Middelkerke Bank (one of the Flemish Banks located in the southern North Sea off the coast of Oostende, Belgium) has been studied in the framework of the Marine Science and Technology (MAST) program co-funded by the European Community. A dense grid of high and very high resolution seismic profiles has been used, as well as several vibrocorings. Seven major seismic units can be identified in the Quaternary sediments, bounded by major discontinuities correlated across the whole study area. The lower units clearly appear as being deposited during periods of relative low sea level (channel infillings, shoreface, estuarine and/or ebb-tidal delta deposits). The present shape of the bank results partly from recent erosional processes, reworking the underlying deposits. Thus, the lower part of the bank as a morphological feature does not consist of “offshore tidal sands”. The master bedding of the upper part of the bank consists of inclined reflectors, dipping at an angle of about 5° in the same direction as the bank's “steep” face. These reflectors, very similar to those described by Houbolt (1968), are interpreted as being the result of alternating periods of deposition and erosion related to the episodic combination of tidal currents and storms. |
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