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Seafloor morphology of the Seafloor morphology of the George V Land shelf, Antarctica George V Land shelf, Antarctica Robin J. Beaman Robin J. Beaman School of Geography and Environmental Studies, University of Tasmania ?

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Page 1: Seafloor morphology of the George V Land shelf, Antarctica · Seafloor morphology maps will help characterise the seabed and be useful for future studies on marine habitats of the

Seafloor morphology of the Seafloor morphology of the George V Land shelf, AntarcticaGeorge V Land shelf, Antarctica

Robin J. BeamanRobin J. BeamanSchool of Geography and Environmental Studies, University of Tasmania

?

Page 2: Seafloor morphology of the George V Land shelf, Antarctica · Seafloor morphology maps will help characterise the seabed and be useful for future studies on marine habitats of the

Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 2

Commonwealth Bay

Dibble Iceberg Tongue

Terre Adélie

Dumont D’urville

Radarsat ScanSAR7 August, 1999

100 km

Mertz Glacier

George V Land

N

Page 3: Seafloor morphology of the George V Land shelf, Antarctica · Seafloor morphology maps will help characterise the seabed and be useful for future studies on marine habitats of the

Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 3

George V Land shelfGeorge V Land shelf

N

Page 4: Seafloor morphology of the George V Land shelf, Antarctica · Seafloor morphology maps will help characterise the seabed and be useful for future studies on marine habitats of the

Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 4

Data sets Data sets –– WEGA & NBP0101WEGA & NBP0101

George V Land

MertzGlacier

Mertz BankAdelieBank

100km

N

66°S

144°E

Page 5: Seafloor morphology of the George V Land shelf, Antarctica · Seafloor morphology maps will help characterise the seabed and be useful for future studies on marine habitats of the

Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 5

Morphology or acoustic Morphology or acoustic faciesfacies

Damuth (1980) echo types

IA-2

IIB

IIIC

IB

100km

N

66°S

144°E

Page 6: Seafloor morphology of the George V Land shelf, Antarctica · Seafloor morphology maps will help characterise the seabed and be useful for future studies on marine habitats of the

Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 6

Type IAType IA--2 (ice2 (ice--keel turbate)keel turbate)

1km

400m

450

500

Page 7: Seafloor morphology of the George V Land shelf, Antarctica · Seafloor morphology maps will help characterise the seabed and be useful for future studies on marine habitats of the

Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 7

Type IB (ooze deposits)Type IB (ooze deposits)

1km

800m

825

850

Page 8: Seafloor morphology of the George V Land shelf, Antarctica · Seafloor morphology maps will help characterise the seabed and be useful for future studies on marine habitats of the

Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 8

Type IIB (smooth Type IIB (smooth diamictondiamicton))

1km

850m

900

950

Page 9: Seafloor morphology of the George V Land shelf, Antarctica · Seafloor morphology maps will help characterise the seabed and be useful for future studies on marine habitats of the

Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 9

Type IIIC (ridges and canyons)Type IIIC (ridges and canyons)

1/2km

400m

450

500

Page 10: Seafloor morphology of the George V Land shelf, Antarctica · Seafloor morphology maps will help characterise the seabed and be useful for future studies on marine habitats of the

Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 10

Moraine or ridgeMoraine or ridge

5km

150m

200

250

Page 11: Seafloor morphology of the George V Land shelf, Antarctica · Seafloor morphology maps will help characterise the seabed and be useful for future studies on marine habitats of the

Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 11

Mertz Drift Mertz Drift -- hillshadehillshade

Page 12: Seafloor morphology of the George V Land shelf, Antarctica · Seafloor morphology maps will help characterise the seabed and be useful for future studies on marine habitats of the

Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 12

IceIce--keel keel turbateturbate

hillshade backscatter

Page 13: Seafloor morphology of the George V Land shelf, Antarctica · Seafloor morphology maps will help characterise the seabed and be useful for future studies on marine habitats of the

Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 13

Ooze depositOoze deposit

hillshade backscatter

Page 14: Seafloor morphology of the George V Land shelf, Antarctica · Seafloor morphology maps will help characterise the seabed and be useful for future studies on marine habitats of the

Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 14

Ice flowIce flow

100km

N

66°S

144°E

Page 15: Seafloor morphology of the George V Land shelf, Antarctica · Seafloor morphology maps will help characterise the seabed and be useful for future studies on marine habitats of the

Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 15

Last Glacial Maximum

CDW

Mertz Glacierice sheet

moraine George V Basin

IA-2

IIB IIIC

Page 16: Seafloor morphology of the George V Land shelf, Antarctica · Seafloor morphology maps will help characterise the seabed and be useful for future studies on marine habitats of the

Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 16

Open marine phase

CDWMCDW

HSSW

sea ice

Mertz Glacierice cliff

IA-2

IIB IIIC

IA-2

IB

Page 17: Seafloor morphology of the George V Land shelf, Antarctica · Seafloor morphology maps will help characterise the seabed and be useful for future studies on marine habitats of the

Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 17

ConclusionsConclusions•• George V Land shelf is comprised of four George V Land shelf is comprised of four acoustic acoustic faciesfacies types and a lateral morainetypes and a lateral moraine

•• Backscatter interpretation mostly confirms Backscatter interpretation mostly confirms seafloor morphology and seafloor morphology and faciesfacies boundariesboundaries

•• Understanding these features provides a shelfUnderstanding these features provides a shelf--wide interpretation of the wide interpretation of the palaeoenvironmentpalaeoenvironment

•• Seafloor morphology maps will help Seafloor morphology maps will help characterisecharacterise the seabed and be useful for future the seabed and be useful for future studies on marine habitats of the Antarctic shelfstudies on marine habitats of the Antarctic shelf

Page 18: Seafloor morphology of the George V Land shelf, Antarctica · Seafloor morphology maps will help characterise the seabed and be useful for future studies on marine habitats of the

Australian Marine Science Association Annual Conference, Fremantle, Australia, 10-12 July 2002 18

AcknowledgementsAcknowledgements

•• Dr Richard Coleman Dr Richard Coleman University of TasmaniaUniversity of Tasmania

•• Dr Peter Harris, Mr Rick Smith Dr Peter Harris, Mr Rick Smith GeoscienceGeoscience Australia/Antarctic CRCAustralia/Antarctic CRC

•• Dr Amy Leventer,Dr Amy Leventer,Colgate University, New YorkColgate University, New York


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