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

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