A Pleistocene warming event at 1 Ma in Prydz Bay, East Antarctica: Evidence from ODP Site 1165

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 116...

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Bibliographic Details
Published in:Palaeogeography, Palaeoclimatology, Palaeoecology
Main Authors: Villa, G., Lupi, C., Cobianchi, M., Florindo, F., Pekar, S. F.
Other Authors: Villa, G.; Dipartimento di Scienze della Terra, Università di Parma, Lupi, C.; Dipartimento di Scienze della Terra, Università di Pavia, Cobianchi, M.; Dipartimento di Scienze della Terra, Università di Pavia, Florindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Pekar, S. F.; Lamont-Doherty Earth Observatoryof ColumbiaUniversity, Palisades, NewYork, Dipartimento di Scienze della Terra, Università di Parma, Dipartimento di Scienze della Terra, Università di Pavia, Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Lamont-Doherty Earth Observatoryof ColumbiaUniversity, Palisades, NewYork
Format: Article in Journal/Newspaper
Language:English
Published: ELSEVIER 2008
Subjects:
ANTARCTICA
03. Hydrosphere::03.01. General::03.01.06. Paleoceanography and paleoclimatology
Antarctic
The Antarctic
East Antarctica
Prydz Bay
East Antarctic Ice Sheet
Cape Roberts
Annals of Glaciology
Antarc*
Antarctic Science
Antarctica
Ice Sheet
Polarforschung
Online Access:http://hdl.handle.net/2122/3849
http://www.sciencedirect.com/science/journal/00310182
https://doi.org/10.1016/j.palaeo.2007.08.017
Description
Summary: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. Published 230-244 2.2. Laboratorio di paleomagnetismo JCR Journal reserved

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