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SeafloorSeafloor morphologymorphology ofof thethe GeorgeGeorge VV LandLand shelf,shelf, AntarcticaAntarctica ? RobinRobin J.J. BeamanBeaman School of Geography and Environmental Studies, University of Tasmania Radarsat ScanSAR 7 August, 1999 Mertz Glacier Commonwealth Bay George V Land Dumont D’urville N 100 km Terre Adélie Dibble Iceberg Tongue Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 2 GeorgeGeorge VV LandLand shelfshelf N Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 3 DataData setssets –– WEGAWEGA && NBP0101NBP0101 66°S Mertz Bank Adelie Bank N 100km Mertz Glacier George V Land 144°E Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 4 MorphologyMorphology oror acousticacoustic faciesfacies 66°S IA-2 IIB IB IIIC N 100km Damuth (1980) echo types 144°E Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 5 TypeType IAIA--22 (ice(ice--keelkeel turbate)turbate) 400m 450 1km 500 Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 6 TypeType IBIB (ooze(ooze deposits)deposits) 800m 825 850 1km Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 7 TypeType IIBIIB (smooth(smooth diamictondiamicton)) 850m 900 1km 950 Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 8 TypeType IIICIIIC (ridges(ridges andand canyons)canyons) 400m 450 500 1/2km Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 9 MoraineMoraine oror ridgeridge 150m 200 250 5km Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 10 MertzMertz DriftDrift -- hillshadehillshade Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 11 IceIce--keelkeel turbateturbate hillshade backscatter Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 12 OozeOoze depositdeposit hillshade backscatter Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 13 IceIce flowflow 66°S N 100km 144°E Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 14 Last Glacial Maximum moraine George V Basin Mertz Glacier ice sheet CDW -2 IA C I I I IIB Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 15 Open marine phase Mertz Glacier ice cliff sea ice CDW -2 IA MCDW IA -2 C I I HSSW I IIB IB Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 16 ConclusionsConclusions •• GeorgeGeorge VV LandLand shelfshelf isis comprisedcomprised ofof fourfour acousticacoustic faciesfacies typestypes andand aa laterallateral morainemoraine •• BackscatterBackscatter interpretationinterpretation mostlymostly confirmsconfirms seafloorseafloor morphologymorphology andand faciesfacies boundariesboundaries •• UnderstandingUnderstanding thesethese featuresfeatures providesprovides aa shelfshelf-- widewide interpretationinterpretation ofof thethe palaeoenvironmentpalaeoenvironment •• SeafloorSeafloor morphologymorphology mapsmaps willwill helphelp characterisecharacterise thethe seabedseabed andand bebe usefuluseful forfor futurefuture studiesstudies onon marinemarine habitatshabitats ofof thethe AntarcticAntarctic shelfshelf Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 17 AcknowledgementsAcknowledgements •• DrDr RichardRichard ColemanColeman UniversityUniversity ofof TasmaniaTasmania •• DrDr PeterPeter Harris,Harris, MrMr RickRick SmithSmith GeoscienceGeoscience Australia/AntarcticAustralia/Antarctic CRCCRC •• DrDr AmyAmy Leventer,Leventer, ColgateColgate University,University, NewNew YorkYork Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 18.