(Table 1) Late Pleistocene planktonic foraminifera of Hole 302-M0004C

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 centimet...

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Bibliographic Details
Main Authors: Eynaud, Frédérique, Cronin, Thomas M, Smith, Shannon A, Zaragosi, Sebastien, Mavel, J, Mary, Yannick, Mas, Virginie, Pujol, Claude
Format: Dataset
Language:English
Published: PANGAEA 2009
Subjects:
302-M0004C
ACEX-M4C
Arctic Coring Expedition
ACEX
Arctic Ocean
Biogenic indeterminata
Counting >125 µm fraction
Depth
composite top
sediment/rock
Exp302
Foraminifera
planktic
Globigerina bulloides
Globigerina quinqueloba
Integrated Ocean Drilling Program / International Ocean Discovery Program
Intercore correlation
IODP
Neogloboquadrina atlantica
Neogloboquadrina pachyderma dextral
Neogloboquadrina pachyderma sinistral
Number
Sample code/label
Sample type
split
Vidar Viking
Arctic
Foraminifera*
Neogloboquadrina pachyderma
North Atlantic
Planktonic foraminifera
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.672078
https://doi.org/10.1594/PANGAEA.672078
Description
Summary: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.

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