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Authors: Caburlotto, A.*
Lucchi, R. G.*
De Santis, L.*
Macrì, P.*
Tolotti, R.*
Title: Sedimentary processes on the Wilkes Land continental rise reflect changes in glacial dynamic and bottom water flow
Title of journal: International Journal of Earth Sciences
Series/Report no.: 4 / 99 (2010)
Publisher: Springer
Issue Date: Jun-2010
DOI: 10.1007/s00531-009-0422-8
Keywords: High salinity shelf water
Turbidity currents
Glacio-marine depositional processes
Marine isotopic stage 11
Glacial dynamic changes
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 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).
Appears in Collections:02.02.05. Ice dynamics
04.04.08. Sediments: dating, processes, transport
04.05.06. Paleomagnetism
Papers Published / Papers in press

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