Planktonic foraminiferal assemblages of DSDP Hole 75-532

Qualitative and quantitative analyses of planktonic foraminiferal assemblages from Deep Sea Drilling Project site 532 shed light on hydrographic changes over the Walvis Ridge during the past 500,000 years. From changes in distribution of foraminiferal assemblages, two major hydrographic regimes (coastal and geostrophic branches of the Benguela Current and the Angola Current) can be distinguished at site 532. It is suggested that the hydrographic situation on the northeastern Walvis Ridge was characterized by intensified upwelling and a westward expansion of the coastal upwelling cells during several global cooling pulses. During glacial stages 2-4, the middle part of stage 6, sporadically from the lower stage 8 through upper stage 10, and during stage 12, site 532 was located beneath the coastal branch of the Benguela Current because faunal distribution patterns indicate intensified upwelling. The Angola Current probably intruded the area of study during the lower stages 5, sporadically 6-8, and 11, as documented by the increased abundance of Neogloboquadrina dutertrei.

Data and Resources

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Cite this as

Oberhänsli, Hedi (1991). Dataset: Planktonic foraminiferal assemblages of DSDP Hole 75-532. https://doi.org/10.1594/PANGAEA.727563

DOI retrieved: 1991

Additional Info

Field Value
Imported on November 30, 2024
Last update November 30, 2024
License CC-BY-3.0
Source https://doi.org/10.1594/PANGAEA.727563
Author Oberhänsli, Hedi
Given Name Hedi
Family Name Oberhänsli
Source Creation 1991
Publication Year 1991
Resource Type application/zip - filename: Oberhaensli_1991
Subject Areas
Name: Lithosphere

Name: Oceans

Name: Paleontology

Related Identifiers
Title: Upwelling signals at the northeastern Walvis Ridge during the past 500,000 years
Identifier: https://doi.org/10.1029/90PA02106
Type: DOI
Relation: IsSupplementTo
Year: 1991
Source: Paleoceanography
Authors: Oberhänsli Hedi .