georefid:2008-039594SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2008-0395942007-01-01publicationgeorefid:2008-039594Rebesco, MicheleIstituto Nazionale di Oceanografia e di Geofisica Sperimentale, Trieste, ItalyauthorCamerlenghi, A.Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, ItalyauthorVolpi, V.Universitat de Barcelona, SpainauthorNeagu, C.University of Tromso, NorwayauthorAccettella, D.authorLindberg, B.authorCova, A.authorZgur, F.authorGeological Society of London, London, United KingdompublisherdocumentHardcopyIn: Viana, Adriano R. (editor), Rebesco, Michele (editor), Economic and palaeoceanographic significance of contourite deposits27695-110As 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.completedSedimentary petrologyApplied geophysicsAntarctic PeninsulaAntarcticabathymetrybottom currentsclastic sedimentscontinental margincontinental slopecontouritecurrentsdeep-sea environmentdepositional environmentdriftDrift 7geophysical methodsgeophysical profilesgeophysical surveyslaminationsLeg 178lithofaciesmarine environmentmixingOcean Drilling Programocean floorsODP Site 1095planar bedding structuressediment transportsedimentary structuressedimentsseismic methodsseismic profilessiltSouthern Oceansurveysthermohaline circulationturbiditeurn:org.iodp:exp:178urnlargerWorkCitationcampaignurn:org.iodp:exp:178:site:1095urnlargerWorkCitationstudyurn:org.iodp:exp:178urnlargerWorkCitationcampaignEnglishgeoscientificInformation-80.0000-74.0000-68.0000-66.0000