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Geological Society, London, Special Publications; 2007; v. 276; p. 95-110;
DOI: 10.1144/GSL.SP.2007.276.01.05
© 2007 Geological Society of London

Interaction of processes and importance of contourites: insights from the detailed morphology of sediment Drift 7, Antarctica

M. Rebesco1, A. Camerlenghi2, V. Volpi1, C. Neagu1, D. Accettella1, B. Lindberg3, A. Cova1, F. Zgur1 & Magico Party

1 Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Borgo Grotta Gigante 42/c, 34010 Sgonico (Trieste), Italy (e-mail: mrebesco{at}ogs.trieste.it)
2 ICREA, Institució Catalana de Recerca i Estudis Avançats, c/o GRC Geociencies Marines, Departament d'Estratigrafia, P. i Geociències Marines, Universitat de Barcelona, Facultat de Geologia, C/ Martí i Franquès, s/n, E-08028 Barcelona, Spain
3 Department of Geology, University of Tromsø, Dramsveien 201, NO-9037 Tromsø, Norway

As the definition of contourites has widened to embrace a large spectrum of sediments in so-called mixed systems, the distinction between contourites and turbidites has become at times vague. The case history of sediment Drift 7 off the Antarctic Peninsula is analysed in this paper in the light of newly acquired swath bathymetry data. The co-existence of various sedimentary processes is reflected in a complex morphology: erosional gullies produced by debris flows on the upper part of the continental slope; deeply incised channels at the slope base; main trunk-type inter-drift turbidity channels separating the drifts; slide scars; undulating depositional bedforms interpreted as bottom-current sediment waves; fluid escape structures perhaps associated with deep-water coral bioherms. The data suggest that Drift 7 is a genuine sediment drift in which bottom currents pirate the sediment of the turbidity currents. Finally, we propose that the control on location and elongation of the drift is inherited from an older margin structure. The relationships between bottom current and deposition are investigated through a comparison with the SE Greenland continental margin, an analogous counterpart in the northern hemisphere.





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