Age models of upper Pliocene samples of the North Atlantic ...

Abundance variations of six Pliocene species of discoasters have been analyzed over the time interval from 1.89 to 2.95 Ma at five contrasting sites in the North Atlantic: Deep Sea Drilling Project Sites 552 (56°N) and 607 (41°N) and Ocean Drilling Program 658 (20°N), 659 (18°N), and 662 (1°S). A sa...

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Bibliographic Details
Main Authors: Chepstow-Lusty, Alex J, Backman, Jan, Shackleton, Nicholas J
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 1989
Subjects:
Drilling/drill rig
Leg81
Leg94
Leg108
Glomar Challenger
Joides Resolution
Deep Sea Drilling Project DSDP
Ocean Drilling Program ODP
Shackleton
North Atlantic
Online Access:https://dx.doi.org/10.1594/pangaea.746213
https://doi.pangaea.de/10.1594/PANGAEA.746213
Description
Summary:Abundance variations of six Pliocene species of discoasters have been analyzed over the time interval from 1.89 to 2.95 Ma at five contrasting sites in the North Atlantic: Deep Sea Drilling Project Sites 552 (56°N) and 607 (41°N) and Ocean Drilling Program 658 (20°N), 659 (18°N), and 662 (1°S). A sampling interval equivalent to approximately 3 k.y. was used. Total Discoaster abundance showed a reduction with increasing latitude and from the effects of upwelling.This phenomenon is most obvious in Discoaster brouweri, the only species that survived over the entire time interval studied. Prior to 2.38 Ma, Discoaster pentaradiatus and Discoaster surculus are important components of the Discoaster assemblage: Discoaster pentaradiatus increases slightly with latitude up to 41°N, and its abundance relative to D. brouweri increases up to 56°N; D. surculus increases in abundance with latitude and with upwelling conditions relative to both D. brouweri and D. pentaradiatus and is dominant to the latter species at ... : Supplement to: Chepstow-Lusty, Alex J; Backman, Jan; Shackleton, Nicholas J (1989): Comparison of Upper Pliocene discoaster abundance variations from North Atlantic Sites 552, 607, 658, 659, and 662: further evidence for marine plankton responding to orbital forcing. In: Ruddiman, W; Sarnthein, M; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 108, 121-141 ...

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