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Shelf hypoxia in response to global warming after the Cretaceous-Paleogene boundary impact

Johan Vellekoop, Lineke Woelders, Niels A. G. M. van Helmond, Simone Galeotti, Jan Smit, Caroline P. Slomp, Henk Brinkhuis, Philippe Claeys and Robert P. Speijer
Shelf hypoxia in response to global warming after the Cretaceous-Paleogene boundary impact
Geology (Boulder) (June 2018) 46 (8): 683-686


The Chicxulub asteroid impact at the Cretaceous-Paleogene (K-Pg) boundary resulted in one of the most abrupt global warming events in the past 100 m.y., presenting an analogue to current global warming. Here, we present high-resolution geochemical, micropaleontological, and palynological records of the Brazos-1 (Texas, USA), Stevns Klint (Denmark), and Caravaca (Spain) K-Pg boundary sections to assess the rapid environmental changes during the global warming following the brief K-Pg boundary impact winter. Warming during the first millennia after the impact is associated with hypoxic bottom waters at the studied shelf sites, as indicated by molybdenum enrichments, causing major stress for benthic communities. We attribute this decline in dissolved oxygen to a combination of decreased gas solubility and ocean ventilation resulting from the warming of the sea water, and increased oxygen demand in shelf bottom waters due to increased nutrient inputs and associated high productivity.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 46
Serial Issue: 8
Title: Shelf hypoxia in response to global warming after the Cretaceous-Paleogene boundary impact
Affiliation: Katholieke Universiteit Leuven, Department of Earth and Environmental Sciences, Louvain, Belgium
Pages: 683-686
Published: 20180622
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 36
Accession Number: 2018-057752
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2018232
Illustration Description: illus. incl. geol. sketch map
N30°19'60" - N30°58'00", W96°40'00" - W96°04'60"
N55°13'00" - N55°25'00", E12°05'60" - E12°25'00"
N38°06'00" - N38°06'00", W01°51'00" - W01°51'00"
Secondary Affiliation: Utrecht University, NLD, NetherlandsUniversity of Urbino "Carlo Bo", ITA, ItalyVrije Universiteit Amsterdam, NLD, NetherlandsVrije Universiteit Brussel, BEL, Belgium
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201831
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