(Table 1) Planktonic foraminiferal communities at DSDP Holes 94-609B and 94-609

P W P Hooper; Philip PE Weaver

doi:10.1594/pangaea.788916

(Table 1) Planktonic foraminiferal communities at DSDP Holes 94-609B and 94-609

Citation

Hooper P W P, Weaver P P (1987). (Table 1) Planktonic foraminiferal communities at DSDP Holes 94-609B and 94-609. PANGAEA - Publishing Network for Geoscientific and Environmental Data. Occurrence dataset https://doi.org/10.1594/pangaea.788916 accessed via GBIF.org on 2022-05-18.

Description

The planktonic foraminifers in 124 samples from Holes 609 and 609B have been analyzed quantitatively to see whether oceanographic events in the late Miocene and early Pliocene (6.5-4.0 Ma) are reflected in the distribution of individual species. Major changes in sea-surface temperature and bottom-water circulation are postulated, mainly on the basis of the coiling-direction ratios in Neogloboquadrina pachyderma (Ehrenberg) and a dissolution index. A cool interval peaking at around 6.2 Ma was followed by climatic fluctuations, possibly indicative of glacial cycles, before a general warming in the Pliocene. Intense dissolution of CaCO3 at this site on both sides of the Miocene/Pliocene boundary is inferred to have resulted from the presence of Antarctic Bottom Water, and an influx of less aggressive North Atlantic Deep Water is indicated at the actual boundary. These climatic and oceanographic changes are tentatively linked to the Messinian salinity crisis in the Mediterranean.

Taxonomic Coverages

Chromista
rank: kingdom

Geographic Coverages

Event: 94-609, North Atlantic/FLANK ; Event: 94-609B, North Atlantic/FLANK ;

Bibliographic Citations

Contacts

P W P Hooper
originator

Philip PE Weaver
originator

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

administrative point of contact
PANGAEA - Data Publisher for Earth & Environmental Science
email: info@pangaea.de
homepage: http://www.pangaea.de