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

By
M. Rebesco
M. Rebesco
Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Borgo Grotta Gigante 42/c, 34010 Sgonico (Trieste), Italy (e-mail: mrebesco@ogs.trieste.it)
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A. Camerlenghi
A. Camerlenghi
ICREA, Institució Catalana de Recerca i Estudis Avançats, c/o GRC Geociències Marines, Departament d'Estratigrafia, P. i Geociències Marines, Universitat de Barcelona, Facultat de Geologia, C/ Martí i Franquès, s/n, E-08028 Barcelona, Spain
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V. Volpi
V. Volpi
Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Borgo Grotta Gigante 42/c, 34010 Sgonico (Trieste), Italy (e-mail: mrebesco@ogs.trieste.it)
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C. Neagu
C. Neagu
Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Borgo Grotta Gigante 42/c, 34010 Sgonico (Trieste), Italy (e-mail: mrebesco@ogs.trieste.it)
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D. Accettella
D. Accettella
Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Borgo Grotta Gigante 42/c, 34010 Sgonico (Trieste), Italy (e-mail: mrebesco@ogs.trieste.it)
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B. Lindberg
B. Lindberg
Department of Geology, University of Tromsø, Dramsveien 201, NO-9037 Tromsø, Norway
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A. Cova
A. Cova
Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Borgo Grotta Gigante 42/c, 34010 Sgonico (Trieste), Italy (e-mail: mrebesco@ogs.trieste.it)
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F. Zgur
F. Zgur
Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Borgo Grotta Gigante 42/c, 34010 Sgonico (Trieste), Italy (e-mail: mrebesco@ogs.trieste.it)
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Magico Party
Magico Party
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Published:
January 01, 2007

Abstract:

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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Contents

Geological Society, London, Special Publications

Economic and Palaeoceanographic Significance of Contourite Deposits

A. R. Viana
A. R. Viana
Petrobras, Brazil
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M. Rebesco
M. Rebesco
Petrobras, Brazil
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Geological Society of London
Volume
276
ISBN electronic:
9781862395244
Publication date:
January 01, 2007

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