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Basement control and history of ice-sheet expansion in the Amundsen Sea Embayment First results of recent RV Polarstern and RRS James Clark Ross cruises. K. Gohl, G. Eagles, G. Uenzelmann-Neben, G. Kuhn Alfred Wegener Institute for Polar & Marine Research Bremerhaven, Germany

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Basement control and history of ice-sheet expansion in the Amundsen Sea Embayment

First results of recent RV Polarstern and RRS James Clark Ross cruises

K. Gohl, G. Eagles, G. Uenzelmann-Neben, G. Kuhn

Alfred Wegener Institute for Polar & Marine Research

Bremerhaven, Germany

R. Larter, T. Deen, C.-D. Hillenbrand

British Antarctic Survey, Cambridge, UK

F.O. Nitsche

Lamont-Doherty Earth Observatory, Palisades, NY, USA

Tectonics & Sedimentation in Amundsen Sea & Pine Island Bay

slide2

RV Polarstern cruise ANT-XXIII/4

  • Geoscientific objectives:
  • Reconstruction of glacial cyclicity since begin of glaciation
  • Delineating retreat history after LGM
  • Searching for young volcanism on shelf as constraining factor for grounded ice-sheet stability
  • Understanding break-up process and margin development between MBL/TI and NZ
  • Defining crustal block boundaries

Tectonics & Sedimentation in Amundsen Sea & Pine Island Bay

slide4

Seismic profiling during Polarstern cruise ANT-XXIII/9 (2006)

Marie Byrd

Seamounts

20060200

T.I.

20060100

Ellsworth

Land

Marie Byrd Land

Thick lines: Deep crustal seismic refraction profiles with OBH systems.

Satellite-derived gravity from Laxon & McAdoo (1997).

Tectonics & Sedimentation in Amundsen Sea & Pine Island Bay

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