Planktic foraminiferal turnover across the Paleocene-Eocene transition in the Bay of Biscay, North Atlantic ...

• Main Authors: Pardo, Alfonso, Keller, Gerta, Molina, Eustoquio, Canudo, José I
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1997
• Subjects: Drilling/drill rig; Leg48; Glomar Challenger; Deep Sea Drilling Project DSDP; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.681320; https://doi.pangaea.de/10.1594/PANGAEA.681320

Planktic foraminifera across the Paleocene-Eocene transition at DSDP Site 401 indicate that the benthic foraminiferal mass extinction occurred within Subzone P 6a of Berggren and Miller (1988), or PS of Berggren et al. (1995) and coincident with a sudden 2.0‰ excursion in 6r3C values. The benthic foraminiferal extinction event (BFEE) and Sr3C excursion was accompanied by a planktic foraminiferal turnover marked by an influx of warm water species (Morozovella and Acarinina), a decrease in cooler water species (Subbotina), a sudden short-term increase in low oxygen tolerant taxa (Chiloguembelina), and no significant species extinctions. These faunal changes suggest climatic warming, expansion of the oxygen minimum zone, and a well stratified ocean water column. Oxygen isotope data of the surface dweller M. subbotina suggest climate warming beginning with a gradual 0.5‰ decrease in delta180 in the 175 cm preceding the benthic foraminiferal extinction event followed by a sudden decrease of 1‰ (4°C) at the BFEE. ... : Supplement to: Pardo, Alfonso; Keller, Gerta; Molina, Eustoquio; Canudo, José I (1997): Planktic foraminiferal turnover across the Paleocene-Eocene transition at DSDP Site 401, Bay of Biscay, North Atlantic. Marine Micropaleontology, 29(2), 129-158 ...