2026-11-01T04:26:35Z https://oai.datacite.org/oai

doi:10.1594/pangaea.706554 2026-08-08T03:29:33Z PANGAEA PANGAEA.REPOSITORY

16 PANGAEA.REPOSITORY 10.1594/PANGAEA.706554 Villa, Giuliana Giuliana Villa Lupi, Claudia Claudia Lupi 0000-0002-1728-7226 Cobianchi, Miriam Miriam Cobianchi Florindo, Fabio Fabio Florindo 0000-0002-6058-9748 Pekar, Stephen F Stephen F Pekar PANGAEA 2008 DEPTH, sediment/rock Sample code/label Nannofossil abundance Nannofossils preservation Species richness Calcidiscus leptoporus Ceratolithus telesmus Coccolithus pelagicus Coccolithus pelagicus subsp. braarudii Crenalithus japonicus Crenalithus doronicoides Emiliania huxleyi Gephyrocapsa caribbeanica Gephyrocapsa oceanica Gephyrocapsa omega Gephyrocapsa spp. Gephyrocapsa aperta Gephyrocapsa ericsonii Gephyrocapsa muellerae Helicosphaera carteri Helicosphaera burkei Pseudoemiliania pacifica Pseudoemiliania lacunosa ovata Pseudoemiliania lacunosa Pseudoemiliania lacunosa lacunosa Reticulofenestra asanoi Reticulofenestra celtica Reticulofenestra minuta Umbilicosphaera spp. Umbilicosphaera hulburtiana Thoracosphaera spp. Drilling/drill rig DSDP/ODP/IODP sample designation Smear slide analysis Leg188 Joides Resolution Ocean Drilling Program (ODP) 2000-01-29T05:15:00/2000-02-04T05:30:00 Supplementary Dataset 10.1016/j.palaeo.2007.08.017 3886 data points text/tab-separated-values Creative Commons Attribution 3.0 Unported 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 delta18O 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. Supplement to: Villa, Giuliana; Lupi, Claudia; Cobianchi, Miriam; Florindo, Fabio; Pekar, Stephen F (2008): A Pleistocene warming event at 1 Ma in Prydz Bay, East Antarctica: Evidence from ODP Site 1165. Palaeogeography, Palaeoclimatology, Palaeoecology, 260(1-2), 230-244 67.21905 -64.37965 Indian Ocean