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A Pleistocene warming event at 1 Ma in Prydz Bay, East Antarctica: Evidence from ODP Site 1165
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)
1-2 / 260 (2008)
Publisher
ELSEVIER
Pages (printed)
230-244
Issued date
2008
Alternative Location
Keywords
Abstract
Bio- and magnetostratigraphic age data and nannofossil assemblage analysis from ODP Site 1165 evidence an anomalous warming event of the surface waters in and around Prydz Bay during the Early Pleistocene, approximately 1 Ma. This results from an increase in the abundance of nannofossils at Site 1165, that occurred at 1 Ma. Detailed high-resolution sampling permits a new bio-magnetostratigraphic interpretation for ODP Site 1165. A decrease in δ18O values at Sites 1165 and 1167 also occurs at this time, supporting the presence of warming conditions in the Prydz Bay area. A return to colder surface waters, indicated by the absence or rare occurrence of nannofossils in the upper cores from Site 1165, suggests that more stable glacial conditions existed in the Prydz Bay basin, for the last 900 ka.
The biogenic carbonate sequence identified at Site 1167 is similar to the carbonate shales recovered from the Cape Roberts Project 1. Both have been dated at about 1 Ma, supporting the idea that a significant surface waters warming occurred during the Pleistocene. These data and the presence of calcareous nannofossils from locations around the Antarctic continent also suggest that the warming event was not limited to the analysed basin, but it extended around the East Antarctic continent. These new evidence call for a re-evaluation of the notion that the East Antarctic Ice-Sheet has experienced stable conditions similar to today since the late Neogene.
The biogenic carbonate sequence identified at Site 1167 is similar to the carbonate shales recovered from the Cape Roberts Project 1. Both have been dated at about 1 Ma, supporting the idea that a significant surface waters warming occurred during the Pleistocene. These data and the presence of calcareous nannofossils from locations around the Antarctic continent also suggest that the warming event was not limited to the analysed basin, but it extended around the East Antarctic continent. These new evidence call for a re-evaluation of the notion that the East Antarctic Ice-Sheet has experienced stable conditions similar to today since the late Neogene.
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grain-size analyses, and biogenic silica content of upper
Miocene–lower Pliocene sediments, ODP Site 1165. In: Cooper,
A.K., O'Brien, P.E., Richter, C. (Eds.), Proc. ODP, Sci. Results,
vol. 188. [Online]. Available fromWorldWideWeb: bhttp://wwwodp.
tamu.edu/publications/188_SR/007/007.htmN.
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Sedimentology 47, 577–607.
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Part B. Chemistry, Biology and Geology. San Diego Academic
Press, pp. 687–739.
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East Antarctic ice sheet: stability or dynamism? Geografiska
Annaler. Series A 75, 221–238.
Lear, C.H., Elderfield, H., Wilson, P.A., 2000. Cenozoic deep-sea
temperatures and global ice volumes from Mg/Ca in Benthic
Foraminiferal Calcite. Science 287, 269–272.
Lourens, L.J., Hilgen, F.J., Laskar, J., Schakleton, N.J., Wilson, D.,
2004. The Neogene Period. In: Gradstein, F., Ogg, J., Smith, A.G.
(Eds.), Geological Time Scale 2004. Cambridge University Press,
Cambridge, pp. 409–440.
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oceanographic developments in theWeddell Sea,Antarctica; an oceandrilling
perspective. Proceedings of the Ocean Drilling Program,
Weddell Sea, Antarctica, covering Leg 113 of the Cruises of the
Drilling Vessel JOIDES Resolution, Valparaiso, Chile, to East Cove,
Falkland Islands, sites 689–697, 25 December 1986–11 March 1987.
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ice sheets during warm climates. GSA Today 5 (1), 9–22.
Maiorano, P.,Marino,M., 2004. Calcareous nannofossil bioevents and
environmental control on temporal and spatial patterns at the early–
middle Pleistocene. Marine Micropaleontology 53, 405–422.
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nannoplankton zonation. In: Farinacci, A. (Ed.), Proceeding of
2nd International Conference of Planktonic Microfossils Roma,
vol. 2, pp. 739–785.
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nannoplankton in the subtropical northwestern Pacific Ocean.
Marine Micropaleontology 14, 97–118.
Matsuoka, H., Okada, H., 1990. Time-progressive morphometric
changes of the genus Gephyrocapsa in the Quaternary sequence of
the tropical Indian Ocean, Site 709. In: Duncan, R.A., Backman, J.,
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