Planktonic foraminifera in the latest Maastrichtian of Walvis Ridge, South Atlantic ...

• Main Authors: Abramovich, Sigal, Keller, Gerta
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2003
• Subjects: Drilling/drill rig; Leg74; Glomar Challenger; Deep Sea Drilling Project DSDP; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.678299; https://doi.pangaea.de/10.1594/PANGAEA.678299

An abrupt global warming of 3-4°C occurred near the end of the Maastrichtian at 65.45-65.10 Ma. The environmental effects of this warm event are here documented based on stable isotopes and quantitative analysis of planktonic foraminifera at the South Atlantic DSDP Site 525A. Stable isotopes of individual species mark a rapid increase in temperature and a reduction in the vertical water mass stratification that is accompanied by a decrease in niche habitats, reduced species diversity and/or abundance, smaller species morphologies or dwarfing, and reduced photosymbiotic activity. During the warm event, the relative abundance of a large number of species decreased, including tropical-subtropical affiliated species, whereas typical mid-latitude species retained high abundances. This indicates that climate warming did not create favorable conditions for all tropical-subtropical species at mid-latitudes and did not cause a massive retreat in the local mid-latitude population. A noticeable exception is the ... : Supplement to: Abramovich, Sigal; Keller, Gerta (2003): Planktonic foraminiferal response to the latest Maastrichtian abrupt warm event: a case study from South Atlantic DSDP Site 525A. Marine Micropaleontology, 48(3-4), 225-249 ...