Paleoceanographic changes across the latest Danian Event in the South Atlantic Ocean and planktic Foraminiferal response

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doi: 10.1016/j.palaeo.2019.03.024
Author(s): Jehle, Sofie; Bornemann, André; Lägel, Anna Friederike; Deprez, Arne; Speijer, Robert P.
Author Affiliation(s): Primary:
Universität Leipzig, Institut für Geophysik und Geologie, Leipzig, Germany
Bundesanstalt für Geowissenschaften und Rohstoffe, Germany
Katholieke Universiteit Leuven, Belgium
Volume Title: Palaeogeography, Palaeoclimatology, Palaeoecology
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol.525, p.1-13. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. 107 refs.; illus.
Summary: A number of short warming events occurred during Paleocene and Eocene, of which the "Paleocene-Eocene Thermal Maximum" (PETM, 56 Ma) is the most severe and most investigated event. The less known "Latest Danian Event" (LDE) at 62.2 Ma represents a 200 ky-lasting warming phase, superimposed on a long-term cooling trend after the Early Paleocene. South Atlantic ODP Site 1262 data, covering ∼1 myr, indicate a warming of the entire water column by 1.5-2.6 °C, accompanying a prominent negative carbon isotope excursion (∼0.9-1.1 ppm) and a long-term re-organization of the planktic foraminiferal fauna associated with the LDE. This study unravels a different paleoceanographic evolution of the upper ocean structure compared to results from Pacific ODP Site 1210. Unlike the Pacific, the Atlantic site lacks an apparent change of stratification as well as an overall dominance of thermocline dwelling planktic foraminifera species and a low abundance of surface dwelling photosymbiotic foraminifera. Within the LDE, indications for a slightly enhanced stratification of the upper water column and transient warming were indicated when surface dwelling planktic foraminifera became temporarily more abundant. The long-term evolution in planktic foraminifera with the disappearance of Praemurica at the LDE onset and a contemporaneous rise in Morozovella is similar to the trends reported from Shatsky Rise ODP Site 1210.
Year of Publication: 2019
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Assemblages; Atlantic Ocean; Biostratigraphy; C-13/C-12; Calcite; Carbon; Carbonaceous composition; Carbonates; Cenozoic; Chemostratigraphy; Climate change; Cores; Danian; Foraminifera; Isotope ratios; Isotopes; Leg 198; Leg 208; Lower Paleocene; Microfossils; Morozovella; North Pacific; Northwest Pacific; O-18/O-16; ODP Site 1210; ODP Site 1262; Ocean Drilling Program; Oxygen; Pacific Ocean; Paleo-oceanography; Paleocene; Paleogene; Planktonic taxa; Praemurica; Sea water; Shatsky Rise; South Atlantic; Stable isotopes; Statistical analysis; Stratification; Tertiary; Walvis Ridge; West Pacific
Coordinates: N321300 N321300 E1581600 E1581600
S271100 S271100 E0013500 E0013400
Record ID: 2019061673
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands