Publication Date:
2020-12-15
Description:
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).
Description:
Published
Description:
909 - 926
Description:
2.2. Laboratorio di paleomagnetismo
Description:
JCR Journal
Description:
restricted
Keywords:
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
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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