Glacial morphology and post-glacial contourites in northern Prince Gustav Channel (NW Weddell Sea, Antarctica)

Angelo Camerlenghi, Eugene Domack, Michele Rebesco, Robert Gilbert, Scott Ishman, Amy Leventer, Stefanie Brachfeld, Allison Drake

Research output: Contribution to journalArticle

55 Scopus citations

Abstract

We present the results of a marine geophysical investigation of the northern Prince Gustav Channel. By comparative analysis of multibeam bathymetric data, single channel seismic reflection profiles, underway chirp sonar data, ADCP current data and sediment coring, we define the main morphological elements of the area. In particular we define the glacial morphogenesis in relation to the excavation of inner shelf basins and troughs along structural discontinuities and lithologic boundaries. We identify streamlined surfaces that testify to the grounding of ice and past ice flow directions. These glacial forms are found only on glacial tills preserved in the deepest part of the basins, while net erosion to bedrock has occurred elsewhere. Since the Last Glacial Maximum (LGM), the relict glacial morphology has been draped by hemipelagic and diatomaceous mud, and bottom currents have played a major role in focusing sedimentation within small depocentres, that we define as contouritic drifts. Based on shallow sediment architecture and supported by direct measurements, we propose that the direction of bottom water flow is from the outer shelf into the Prince Gustav channel as a result of a combinations of tidal currents and ice shelf-related thermohaline circulation.

Original languageEnglish
Pages (from-to)417-443
Number of pages27
JournalMarine Geophysical Research
Volume22
Issue number5-6
DOIs
StatePublished - 1 Sep 2001

Keywords

  • Antarctica
  • Contourite drifts
  • Glacial morphology
  • Prince Gustav Channel
  • Weddell Sea

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