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Eynaud, Frédérique; Cronin, Thomas M; Smith, Shannon A; Zaragosi, Sebastien; Mavel, J; Mary, Yannick; Mas, Virginie; Pujol, Claude (2009): (Table 1) Late Pleistocene planktonic foraminifera of Hole 302-M0004C. PANGAEA, https://doi.org/10.1594/PANGAEA.672078, Supplement to: Eynaud, F et al. (2009): Morphological variability of the planktonic foraminifer Neogloboquadrina pachyderma from ACEX cores: implications for late Pleistocene circulation in the Arctic Ocean. Micropaleontology, 55(2-3), 101-116

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Abstract:
Planktonic foraminifera populations were studied throughout the top 25 meters of the IODP ACEX 302 Hole 4C from the central Arctic Ocean at a resolution varying from 5cm (at the top of the record) to 10cm. Planktonic foraminifera occur in high absolute abundances only in the uppermost fifty centimetres and are dominated by the taxa Neogloboquadrina pachyderma. Except for a few intermittent layers below this level,most samples are barren of calcareous microfossils.Within the topmost sediments, Neogloboquadrina pachyderma specimens present large morphological variability in the shape and number of chambers in the finalwhorl, chamber sphericity, size, and coiling direction. Five morphotypeswere identified among the sinistral (sin.) population (Nps-1 to Nps-5), including a small form (Nps-5) that is similar to a non-encrusted normal form also previously identified in the modern Arctic Ocean watermasses. Twenty five percent of the sinistral population is made up by large specimens (Nps-2, 3, 4), with a maximal mean diameter larger than 250µm. Following observations made in peri-Arctic seas (Hillaire-Marcel et al. 2004, doi:10.1016/j.quascirev.2003.08.006), we propose that occurrence of these large-sized specimens of N. pachyderma (sin.) in the central Arctic Ocean sediments could sign North Atlantic water sub-surface penetration.
Coverage:
Latitude: 87.867750 * Longitude: 136.189680
Date/Time Start: 2004-09-03T00:00:00 * Date/Time End: 2004-09-03T00:00:00
Minimum DEPTH, sediment/rock: 0.03 m * Maximum DEPTH, sediment/rock: 3.50 m
Event(s):
302-M0004C (ACEX-M4C) * Latitude: 87.867750 * Longitude: 136.189680 * Date/Time: 2004-09-03T00:00:00 * Elevation: -1287.9 m * IGSN: IBCR0302RHXS001 * Penetration: 37.33 m * Recovery: 25.6 m * Location: Arctic Ocean * Campaign: Exp302 (Arctic Coring Expedition, ACEX) * Basis: CCGS Captain Molly Kool (Vidar Viking)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepth sedmGeocode
2Sample code/labelSample labelEynaud, Frédérique
3Depth, composite topDepth comp topmcdEynaud, FrédériqueIntercore correlation
4Neogloboquadrina pachyderma sinistralN. pachyderma s#Eynaud, FrédériqueCounting >125 µm fractionMorphotype NPS-1
5Neogloboquadrina pachyderma sinistralN. pachyderma s#Eynaud, FrédériqueCounting >125 µm fractionMorphotype NPS-2
6Neogloboquadrina pachyderma sinistralN. pachyderma s#Eynaud, FrédériqueCounting >125 µm fractionMorphotype NPS-3
7Neogloboquadrina pachyderma sinistralN. pachyderma s#Eynaud, FrédériqueCounting >125 µm fractionMorphotype NPS-4
8Neogloboquadrina pachyderma sinistralN. pachyderma s#Eynaud, FrédériqueCounting >125 µm fractionMorphotype NPS-5
9Neogloboquadrina pachyderma sinistralN. pachyderma s#Eynaud, FrédériqueCounting >125 µm fractionTotal NPS
10Neogloboquadrina pachyderma sinistralN. pachyderma s#Eynaud, FrédériqueCounting >125 µm fraction
11Neogloboquadrina pachyderma dextralN. pachyderma d#Eynaud, FrédériqueCounting >125 µm fractionMorphotype NPD-1
12Neogloboquadrina pachyderma dextralN. pachyderma d#Eynaud, FrédériqueCounting >125 µm fractionMorphotype NPD-2
13Neogloboquadrina pachyderma dextralN. pachyderma d#Eynaud, FrédériqueCounting >125 µm fractionTotal NPD
14NumberNoEynaud, Frédérique
15NumberNoEynaud, FrédériqueNumber of counted squares (max 50)
16Neogloboquadrina atlanticaN. atlantica#Eynaud, FrédériqueCounting >125 µm fraction
17Globigerina quinquelobaG. quinqueloba#Eynaud, FrédériqueCounting >125 µm fraction
18Globigerina bulloidesG. bulloides#Eynaud, FrédériqueCounting >125 µm fraction
19Biogenic indeterminataBiog indet#Eynaud, FrédériqueCounting >125 µm fraction
20Foraminifera, plankticForam plankt#Eynaud, FrédériqueCounting >125 µm fraction
21Sample typeSamp typeEynaud, Frédérique
22SplitSplitEynaud, Frédériquesplit
23Foraminifera, plankticForam plankt#/gEynaud, FrédériqueCounting >125 µm fraction
24Foraminifera, plankticForam plankt#/gEynaud, FrédériqueCounting >125 µm fraction#/10 g sediment
Size:
943 data points

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