The Celtic Sea banks: an example of sand body analysis from very high-resolution seismic data

Type Article
Date 1999-06
Language English
Author(s) Marsset TaniaORCID1, Tessier Bernadette2, Reynaud Jean-Yves2, de Batist M3, Plagnol Clara1
Affiliation(s) 1 : IFREMER, DRO, GM, Lab Environnements Sedimentaires, F-29280 Plouzane, France.
2 : Univ Lille 1, Lab Sedimentol & Geodynam, F-59655 Villeneuve Dascq, France.
3 : State Univ Ghent, Inst Geol, Renard Ctr Marine Geol, B-9000 Ghent, Belgium.
Source Marine Geology (0025-3227) (Elsevier Science Bv), 1999-06 , Vol. 158 , N. 1-4 , P. 89-109
DOI 10.1016/S0025-3227(98)00188-1
WOS© Times Cited 26
Keyword(s) sand bank, tidal dynamics, dunes, channels, Celtic Sea, very high-resolution seismics
Abstract Very high-resolution seismic data from the Kaiser-I-Hind sand bank (southern Celtic Sea) recently highlighted the internal structure of the enigmatic Celtic Banks, which are among the deepest and largest shelf sand ridges. The main body of the bank is made up of 4 seismic/depositional units which reflect a transgressive evolution. New data on the detailed architecture of two of these units allow discussion of bank growth in terms of either (1) a channel–levee system preserved both by lateral migration and aggradation of the channels, or (2) a package of large offshore tidal sediment bodies (bar chains and/or giant dunes). Careful geometrical observations of seismic discontinuities make the second hypothesis more likely. The unit architecture is analysed in terms of long- to short-term processes of build-up. Long-term processes are evinced by the landward stacking of erosive sub-units in response of the last post-glacial sea-level rise, whereas short-term processes control the seaward progradation of sand bodies and fills due to the ebb predominance of the Western Channel Approaches.
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