Sedimentary processes on the Wilkes Land continental rise reflect changes in glacial dynamic and bottom water flow

• Published in: International Journal of Earth Sciences
• Main Authors: Caburlotto, A., Lucchi, R. G., De Santis, L., Macrì, P., Tolotti, R.
• Other Authors: Caburlotto, A.; Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, OGS, Borgo grotta Gigante 42/c, 34010 Sgonico, Italy, Lucchi, R. G.; Department D’Estatrigrafia, P. i Geocie´nces Marines, Universitat de Barcelona, C/Martı´ i Franque`s, s/n, 08028 Barcelona, Spain, De Santis, L.; Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, OGS, Borgo grotta Gigante 42/c, 34010 Sgonico, Italy, Macrì, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Tolotti, R.; Dip. Te. Ris., Universita` degli Studi di Genova, Corso Europa 26, 16132 Genoa, Italy, Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, OGS, Borgo grotta Gigante 42/c, 34010 Sgonico, Italy, Department D’Estatrigrafia, P. i Geocie´nces Marines, Universitat de Barcelona, C/Martı´ i Franque`s, s/n, 08028 Barcelona, Spain, Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Dip. Te. Ris., Universita` degli Studi di Genova, Corso Europa 26, 16132 Genoa, Italy
• Format: Article in Journal/Newspaper
• Language: English
• Published: Springer 2010
• Subjects: High salinity shelf water; Turbidity currents; Glacio-marine depositional processes; Marine isotopic stage 11; Glacial dynamic changes; 02. Cryosphere::02.02. Glaciers::02.02.05. Ice dynamics; 04. Solid Earth::04.04. Geology::04.04.08. Sediments: dating; processes; transport; 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism; George V Land; Wega; Wilkes Land; Ice Sheet
• Online Access: http://hdl.handle.net/2122/6933; https://doi.org/10.1007/s00531-009-0422-8

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 lowenergy 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). Published 909 - 926 2.2. Laboratorio di paleomagnetismo JCR Journal restricted