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Sedimentary processes on the Wilkes Land continental rise reflect changes in glacial dynamic and bottom water flow
Author(s)
Language
English
Obiettivo Specifico
2.2. Laboratorio di paleomagnetismo
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
4 / 99 (2010)
Publisher
Springer
Pages (printed)
909 - 926
Issued date
June 2010
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).
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).
References
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downslope flows: a review. Ocean, Ice and Atmosphere:
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during an Ice Shelf Water overflow in the central Ross Sea. Antarct
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reservoir correction for calcareous marine species in the
Southern Ocean. Geophys Res Lett 23(4):363–366. doi:10.1029/
96GL00151
Bianchi C, Gersonde R (2004) Climate evolution at the last
deglaciation: the role of the Southern Ocean. Earth Planet Sci
Lett 228(3–4):407–424. doi:10.1016/j.epsl.2004.10.003
Bindoff NL, Rosenberg MA, Warner MJ (2000) On the circulation
and water masses over the Antarctic continental slope and rise
between 80 and 150 E. Deep Sea Res Part II Top Stud Oceanogr
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Land Continental Margin, East Antarctica. Deep-Sea Research
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downslope flows: a review. Ocean, Ice and Atmosphere:
interactions at the Antarctic Continental Margin. Antarct Res
Ser 75:29–49
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hydrologique et climatique. Bull Inst Geologie Bassin Aquitaine
29:85–111
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Proceedings of the ocean drilling program, scientific results, 178
[CD-ROM]. Available from: Ocean Drilling Program, Texas
A&M University, College Station, TX 77845–9547, USA
Bergamasco A, Defendi V, Del Negro P, Fonda Umani S (2003) Effects
of the physical properties of water masses on microbial activity
during an Ice Shelf Water overflow in the central Ross Sea. Antarct
Sci 15(3):405–411. doi:10.1017/S0954102003001421
Berkman PA, Forman SL (1996) Pre-bomb radiocarbon and the
reservoir correction for calcareous marine species in the
Southern Ocean. Geophys Res Lett 23(4):363–366. doi:10.1029/
96GL00151
Bianchi C, Gersonde R (2004) Climate evolution at the last
deglaciation: the role of the Southern Ocean. Earth Planet Sci
Lett 228(3–4):407–424. doi:10.1016/j.epsl.2004.10.003
Bindoff NL, Rosenberg MA, Warner MJ (2000) On the circulation
and water masses over the Antarctic continental slope and rise
between 80 and 150 E. Deep Sea Res Part II Top Stud Oceanogr
47:2299–2326. doi:10.1016/S0967-0645(00)00038-2
Bode´n P (1991) Reproducibility in the random settling method for
quantitative diatom analysis. Micropaleontology 37(3):313–319.
doi:10.2307/1485893
Busetti M, Caburlotto A, Armand L, Damiani D, Giorgetti G, Lucchi
RG, Quilty PG, Villa G (2003) Plio-Quaternary sedimentation on
the Wilkes Land continental rise: preliminary results. In: Harris
PT, Brancolini G, Bindoff N, De Santis L (eds) Recent
investigations of the Mertz Polynya and George Vth Land
Continental Margin, East Antarctica. Deep-Sea Research II, vol
50 (8–9), pp 1529–1562
Caburlotto A, De Santis L, Zanolla C, Camerlenghi A, Dix JK (2006)
New insights into Quaternary glacial dynamic changes on the
George V continental margin (East Antarctica). Quat Sci Rev
25:3029–3049. doi:10.1016/j.quascirev.2006.06.012
Cortese G, Gersonde R (2007) Morphometric variability in the diatom
Fragilariopsis kerguelensis: Implications for Southern Ocean
paleoceanography. Earth Planet Sci Lett 257(3–4):526–544. doi:
10.1016/j.epsl.2007.03.021
Cowan EA (2002) Identification of the glacial signal from the
Antarctic Peninsula since 30 Ma at Site 1101 in a continental
rise sediment drift. In: Proceedings of the Ocean Drilling
Program, Scientific Results CD-Rom
Crosta X, Pichon JJ, Labracherie M (1997) Distribution of Chaetoceros
resting spores in modern peri-Antarctic sediments. Mar Micropaleontol
29:283–299. doi:10.1016/S0377-8398(96)00033-3
Crosta X, Romero O, Armand LK, Pichon JJ (2005) The biogeography
of major diatom taxa in Southern Ocean sediments: 2 open
ocean related species. Paleogeogr Paleoclimatol Paleoecol
223:66–92. doi:10.1016/j.palaeo.2005.03.028
De Santis L, Brancolini G, Donda F (2003) Seismo-stratigraphic
analysis of the Wilkes Land continental margin (East Antartica):
influence of glacially driver processes on the Cenozoic deposition.
In: Harris PT, Brancolini G, Bindoff N, De Santis L (eds)
Recent investigations of the Mertz polynya and George Vth
Land Continental Margin, East Antarctica. Deep-Sea Research
II, vol 50 (8–9), pp 1563–1594
Domack EW (1982) Sedimentology of glacial and glacial marine
deposits on the George V-Adelie continental shelf East Antarctica.
Boreas 11(1):79–97
Domack EW (1988) Biogenic facies in the Antarctic glacimarine
environment: basis for a polar Glacimarine summary. Paleogeogr
Paleoclimatol Paleoecol 63:357–372. doi:10.1016/0031-
0182(88)90105-8
Donda F, Brancolini G, De Santis L, Trincardi F (2003) Seismic
facies and sedimentary processes on the continental rise off
Wilkes Land (East Antartica): evidence of bottom current
activity. In: Harris PT, Brancolini G, Bindoff N, De Santis L
(eds) Recent investigations of the Mertz Polynya and George Vth
Land Continental Margin, East Antarctica. Deep-Sea Research
II, vol 50 (8–9), pp 1509–1527
Dunbar R, Anderson JB, Domack EW, Jacobs SS (1985) Oceanographic
influences on sedimentation along the Antarctic
Continental Shelf. In: Jacobs SS, Stanley S (eds) Oceanology
of the Antarctic Continental Shelf. Antarctic Research Series 43,
pp 291–312
Eittreim SL, Smith GL (1987) Seismic sequences and their distribution
on the Wilkes Land margin. In: Eittreim SL, Hampton MA
(eds) The Antarctic continental margin: Geology and Geophysics
of Offshore Wilkes Land. Circum Pacific Council for Energy and
Mineral Resources. Earth Sciences Series 5A, pp 15–43
Eittreim SL, Gorgon AL, Ewing M, Thorndike EM, Bruchhausen PM
(1971) The nepheloid layer and observed bottom currents in the
Indian-Pacific Antarctic sea. In: Gordon AL (ed) Studies in
physical oceanography: a tribute to George Wu¨st on his 80th
birthday. Gordon and Breach, New York, pp 19–35
Eittreim SL, Cooper AK, Wannesson J (1995) Seismic stratigraphic
evidence of icesheet advances on the Wilkes Land margin of
Antarctica. Sediment Geol 96:131–156. doi:10.1016/0037-0738
(94)00130-M
EPICA Community Members (2004) Eight glacials cycles from an
Antarctic ice core. Nature 429:623–628
Escutia C, Eittreim SL, Cooper AK (1997) Cenozoic glaciomarine
sequences on the Wilkes Land continental rise, Antarctica. In:
Proceedings of international symposium on Antarctic earth
sciences VIII, pp 791–795
Escutia C, Eittreim SL, Cooper AK, Nelson CH (2000) Morphology
and acoustic character of the Antarctic Wilkes Land turbidite
system: ice-sheet sourced versus river-sourced fans. J Sediment
Res 70(1):84–93
Escutia C, Warnke D, Acton GD, Barcena A, Burckle L, Canals M,
Frazee CS (2003) Sediment distribution and sedimentary
processes across the Antarctic Wilkes Land margin during the
Quaternary. In: Harris PT, Brancolini G, Bindoff N, De Santis L
(eds) Recent investigations of the Mertz Polynya and George Vth
Land Continental Margin, East Antarctica. Deep-Sea Research
II, vol 50 (8–9), pp 1481–1508
Folk RL, Ward WC (1978) Brazos river bar: a study in the
significance of grain size parameters. J Sediment Petrol 27:3–26
Fryxell GA, Prasad AKSK (1990) Eucampia antarctica var. recta
(Mangin) stat. Nov. (Bacillariophyceae): life stages at the
Weddell Sea ice edge. Phycologia 29(1):27–38
Gordon AL, Tchernia P (1972) Waters of the continental margin of
the Adelie Coast, Antarctica. Antarctic Oceanology. II The
Australian-New Zealand Sector. Antarct Res Ser 19:59–70
Gru¨tzner J, Rebesco M, Cooper AK, Forsberg CF, Kryc KA, Wefer G
(2003) Evidence for orbitally controlled size variations of the
East Antarctic Ice Sheet during the late Miocene. Geology
31(9):777–780
Guyodo Y, Valet J-P (1999) Global changes in intensity of the Earth’s
magnetic field during the past 800 ky. Nature (Lond) 399:249–
252.Hampton MA, Eittreim SL, Richmond BM (1987) Geology of
sediment cores from the George V continental margin. In:
Eittreim SL, Hampton MA (eds) The Antarctic continental
margin: Geology and Geophysics of offshore Wilkes Land.
Circum Pacific Council for Energy and Mineral Resources Earth
Sciences Series 5A, pp 75–88
Harris PT, O’Brien P (1998) Bottom currents, sedimentation and icesheet
retreat facies succession on the Mac Robertson shelf, East
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