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

Frédérique Eynaud; Thomas M Cronin; Shannon A Smith; Sebastien Zaragosi; J Mavel; Yannick Mary; Virginie Mas; Claude Pujol

doi:10.1594/pangaea.672078

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

Citation

Eynaud F, Cronin T M, Smith S A, Zaragosi S, Mavel J, Mary Y, Mas V, Pujol C (2009). (Table 1) Late Pleistocene planktonic foraminifera of Hole 302-M0004C. PANGAEA - Data Publisher for Earth & Environmental Science. Occurrence dataset https://doi.org/10.1594/pangaea.672078 accessed via GBIF.org on 2024-11-03.

Description

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.

Taxonomic Coverages

Chromista
rank: kingdom
Foraminifera
rank: kingdom

Geographic Coverages

Event: 302-M0004C, Arctic Ocean ;

Bibliographic Citations

Contacts

Frédérique Eynaud
originator

Thomas M Cronin
originator

Shannon A Smith
originator

Sebastien Zaragosi
originator

J Mavel
originator

Yannick Mary
originator

Virginie Mas
originator

Claude Pujol
originator

metadata author
PANGAEA - Data Publisher for Earth & Environmental Science
email: info@pangaea.de
homepage: https://www.pangaea.de

Frank-Oliver Glöckner
administrative point of contact

Robert Huber
administrative point of contact