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Pardo, Alfonso; Keller, Gerta; Molina, Eustoquio; Canudo, José I (1997): Planktic foraminiferal turnover across the Paleocene-Eocene transition in the Bay of Biscay, North Atlantic. PANGAEA,, Supplement to: Pardo, A et al. (1997): Planktic foraminiferal turnover across the Paleocene-Eocene transition at DSDP Site 401, Bay of Biscay, North Atlantic. Marine Micropaleontology, 29(2), 129-158,

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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. The delta13C excursion occurred over 27 cm of sediment and, assuming constant sediment accumulation rates, represents a maximum of 23 ka. Recovery to pre-excursion delta13C values occurs within 172 cm, or about 144 ka. Climate cooling begins in Subzone P 6c as indicated by an increase in cooler water subbotinids and acarininids with rounded chambers and a decrease in warm water morozovellids.
Latitude: 47.427500 * Longitude: -8.810300
Date/Time Start: 1976-06-06T00:00:00 * Date/Time End: 1976-06-06T00:00:00
48-401 * Latitude: 47.427500 * Longitude: -8.810300 * Date/Time: 1976-06-06T00:00:00 * Elevation: -2495.0 m * Penetration: 341 m * Recovery: 103.1 m * Location: North Atlantic/TERRACE * Campaign: Leg48 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 24 cores; 228 m cored; 38 m drilled; 45.2 % recovery
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