| Title | Sedimentary processes on the Wilkes Land continental rise reflect changes in glacial dynamic and bottom water flow |
| Author | Caburlotto, A.; Lucchi, R.G.; De Santis, L.; Macri, P.; Tolotti, R. |
| Author Affil | Caburlotto, A., Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, OGS, Sgonico, Italy. Other: Universitat de Barcelona, Spain; Istituto Nazionale di Geofisica e Vulcanologia, Italy; Universita di Genova, Italy |
| Source | International Journal of Earth Sciences = Geologische Rundschau, 99(4), p.909-926, . Publisher: Springer International, Berlin, Federal Republic of Germany. ISSN: 1437-3254 |
| Publication Date | Jun. 2010 |
| Notes | In English. 65 refs. Ant. Acc. No: 88568. GeoRef Acc. No: 300361 |
| Index Terms | algae; channels (waterways); glacial geology; grain size; glacier flow; ocean environments; marine deposits; ocean currents; ocean bottom; Quaternary deposits; sediment transport; sedimentation; sediments; turbidity; Southern Ocean; Antarctica--Wilkes Land; Antarctica; biostratigraphy; bottom currents; Cenozoic; channels; continental margin sedimentation; continental rise; continental shelf; cores; currents; diatoms; George V Land; glacial sedimentation; glaciomarine sedimentation; ice movement; ice streams; lithofacies; marine environment; marine sedimentation; marine sediments; microfossils; MIS 11; ocean floors; Plantae; Quaternary; shelf environment; textures; transport; turbidity currents; WEGA Channel; Wilkes Land |
| Abstract | Four sediment cores were analysed in order to determine the sedimentary processes associated with the channel-ridge depositional system that characterise the George V Land continental margin on the Wilkes Land. The sedimentary record indicates that the WEGA channel was a dynamic turbiditic system up to M.I.S. 11. After this time, the channel became a lower-energy environment with sediments delivered to the channel through high-density bottom waters that we identify to be the high salinity shelf waters (HSSW) forming on the shelf area. The HSSW entrains the fine-grained sediments of the shelf area and deliver them to the continental rise. The biostratigraphy and facies of the sediments within the WEGA channel indicate that the HSSW down flow was active also during last glacial. The change from a turbiditic system to a low-energy bottom current system within the WEGA channel likely reflects a different ice-flow pattern, with ice-sheet reaching the continental shelf edge only within the ice trough (ice stream). Copyright 2009 Springer- Verlag |
| URL | http://hdl.handle.net/10.1007/s00531-009-0422-8 |
| Publication Type | journal article |
| Record ID | 64004907 |