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Villa, Giuliana; Lupi, Claudia; Cobianchi, Miriam; Florindo, Fabio; Pekar, Stephen F (2008): Range chart of calcareous nannofossils from ODP Hole 188-1165B (Table 1). PANGAEA,, Supplement to: Villa, G et al. (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,

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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.
Latitude: -64.379650 * Longitude: 67.219050
Date/Time Start: 2000-01-29T05:15:00 * Date/Time End: 2000-02-04T05:30:00
Minimum DEPTH, sediment/rock: 0.09 m * Maximum DEPTH, sediment/rock: 16.79 m
188-1165B * Latitude: -64.379650 * Longitude: 67.219050 * Date/Time Start: 2000-01-29T05:15:00 * Date/Time End: 2000-02-04T05:30:00 * Elevation: -3537.6 m * Penetration: 682.2 m * Recovery: 434.04 m * Location: Indian Ocean * Campaign: Leg188 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 76 cores; 682.2 m cored; 0 m drilled; 63.6 % recovery
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2Sample code/labelSample labelVilla, GiulianaODP sample designation
3Nannofossil abundanceNannos abund#/mm2Villa, GiulianaSmear slide analysis
4Nannofossils preservationNannos preservVilla, GiulianaSmear slide analysisG = good, M = moderate, P = poor
5Species richnessSVilla, GiulianaSmear slide analysis
6Calcidiscus leptoporusC. leptoporus#/mm2Villa, GiulianaSmear slide analysis
7Ceratolithus telesmusC. telesmus#/mm2Villa, GiulianaSmear slide analysis
8Coccolithus pelagicusC. pelagicus#/mm2Villa, GiulianaSmear slide analysis
9Coccolithus pelagicus ssp. braarudiiC. pelagicus ssp. braarudii#/mm2Villa, GiulianaSmear slide analysis
10Crenalithus japonicusC. japonicus#/mm2Villa, GiulianaSmear slide analysis
11Crenalithus doronicoidesC. doronicoides#/mm2Villa, GiulianaSmear slide analysis
12Emiliania huxleyiE. huxleyi#/mm2Villa, GiulianaSmear slide analysis
13Gephyrocapsa caribbeanicaG. caribbeanica#/mm2Villa, GiulianaSmear slide analysislarge
14Gephyrocapsa caribbeanicaG. caribbeanica#/mm2Villa, GiulianaSmear slide analysismedium
15Gephyrocapsa caribbeanicaG. caribbeanica#/mm2Villa, GiulianaSmear slide analysissmall
16Gephyrocapsa oceanicaG. oceanica#/mm2Villa, GiulianaSmear slide analysislarge
17Gephyrocapsa oceanicaG. oceanica#/mm2Villa, GiulianaSmear slide analysismedium
18Gephyrocapsa oceanicaG. oceanica#/mm2Villa, GiulianaSmear slide analysissmall
19Gephyrocapsa omegaG. omega#/mm2Villa, GiulianaSmear slide analysis
20Gephyrocapsa spp.Gephyrocapsa spp.#/mm2Villa, GiulianaSmear slide analysissmall
21Gephyrocapsa apertaG. aperta#/mm2Villa, GiulianaSmear slide analysis
22Gephyrocapsa ericsoniiG. ericsonii#/mm2Villa, GiulianaSmear slide analysis
23Gephyrocapsa muelleraeG. muellerae#/mm2Villa, GiulianaSmear slide analysis
24Helicosphaera carteriH. carteri#/mm2Villa, GiulianaSmear slide analysis
25Helicosphaera burkeiH. burkei#/mm2Villa, GiulianaSmear slide analysis
26Pseudoemiliania pacificaP. pacifica#/mm2Villa, GiulianaSmear slide analysis
27Pseudoemiliania lacunosa ovataP. lac. ovata#/mm2Villa, GiulianaSmear slide analysis
28Pseudoemiliania lacunosaP. lacunosa#/mm2Villa, GiulianaSmear slide analysis
29Pseudoemiliania lacunosaP. lacunosa#/mm2Villa, GiulianaSmear slide analysissp. 2 <7 µm
30Pseudoemiliania lacunosa lacunosaP. lacunosa lacunosa#/mm2Villa, GiulianaSmear slide analysis<7 µm
31Pseudoemiliania lacunosa lacunosaP. lacunosa lacunosa#/mm2Villa, GiulianaSmear slide analysis>7 µm
32Reticulofenestra asanoiR. asanoi#/mm2Villa, GiulianaSmear slide analysis
33Reticulofenestra celticaR. celtica#/mm2Villa, GiulianaSmear slide analysis
34Reticulofenestra minutaR. minuta#/mm2Villa, GiulianaSmear slide analysis
35Umbilicosphaera spp.Umbilicosphaera spp.#/mm2Villa, GiulianaSmear slide analysis
36Umbilicosphaera hulburtianaU. hulburtiana#/mm2Villa, GiulianaSmear slide analysis
37Thoracosphaera spp.Thoracosphaera spp.Villa, GiulianaSmear slide analysisX = present., - = absent
3886 data points

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