Latest Cretaceous climatic and environmental change in the South Atlantic region

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doi: 10.1002/2016PA003007
Author(s): Woelders, Lineke; Vellekoop, J.; Kroon, D.; Smit, J.; Casadío, S.; Prámparo, M. B.; Dinares-Turell, J.; Peterse, F.; Sluijs, A.; Lenaerts, J. T. M.; Speijer, R. P.
Author Affiliation(s): Primary:
Katholieke Universiteit Leuven, Department of Earth and Environmental Sciences, Leuven, Belgium
University of Edinburgh, United Kingdom
Vrije Universiteit Amsterdam, Netherlands
Universidad Nacional de Rio Negro, Argentina
Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales, Argentina
Istituto Nazionale di Geofisica e Vulcanologia, Italy
Utrecht University, Netherlands
Volume Title: Paleoceanography
Source: Paleoceanography, 32(5), p.466-483. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0883-8305 CODEN: POCGEP
Note: In English. 109 refs.; illus., incl. 1 table, strat. col.
Summary: Latest Maastrichtian climate change caused by Deccan volcanism has been invoked as a cause of mass extinction at the Cretaceous-Paleogene (K-Pg) boundary (∼66.0 Ma). Yet late Maastrichtian climate and ecological changes are poorly documented, in particular on the Southern Hemisphere. Here we present upper Maastrichtian-lower Danian climate and biotic records from the Bajada del Jaguel (BJ) shelf site (Neuquen Basin, Argentina), employing the TEX86 paleothermometer, marine palynology (dinoflagellate cysts), and micropaleontology (foraminifera). These records are correlated to the astronomically tuned Ocean Drilling Program Site 1262 (Walvis Ridge). Collectively, we use these records to assess climatic and ecological effects of Deccan volcanism in the Southern Atlantic region. Both the TEX86-based sea surface temperature (SST) record at BJ and the bulk carbonate δ18O-based SST record of Site 1262 show a latest Maastrichtian warming of ∼2.5-4°C, at 450 to 150 kyr before the K-Pg boundary, coinciding with the a large Deccan outpouring phase. Benthic foraminiferal and dinocyst assemblage changes indicate that this warming resulted in enhanced runoff and stratification of the water column, likely resulting from more humid climate conditions in the Neuquen Basin. These climate conditions could have been caused by an expanding and strengthening thermal low over the South American continent. Biotic changes in response to late Maastrichtian environmental changes are rather limited, when compared to the major turnovers observed at many K-Pg boundary sites worldwide. This suggests that environmental perturbations during the latest Maastrichtian warming event were less severe than those following the K-Pg boundary impact. Abstract Copyright (2017), . American Geophysical Union. All Rights Reserved.
Year of Publication: 2017
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Argentina; Assemblages; Atlantic Ocean; Bajada del Jaguel; Biostratigraphy; Cenozoic; Climate change; Correspondence analysis; Cretaceous; Danian; Dinoflagellata; Foraminifera; Glycerol dialkyl glycerol tetraethers; Invertebrata; Isotope ratios; Isotopes; K-T boundary; Leg 208; Lithostratigraphy; Lower Paleocene; Maestrichtian; Marine environment; Mesozoic; Microfossils; Neuquen Argentina; Neuquen Basin; O-18/O-16; ODP Site 1262; Ocean Drilling Program; Oxygen; Paleocene; Paleoclimatology; Paleoenvironment; Paleogene; Palynomorphs; Protista; South America; South Atlantic; Stable isotopes; Statistical analysis; Stratigraphic boundary; Tertiary; Upper Cretaceous; Walvis Ridge
Coordinates: S380600 S380600 W0682300 W0682300
Record ID: 2017060833
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom