A new high-resolution chronology for the late Maastrichtian warming event : establishing robust temporal links with the onset of Deccan volcanism
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The late Maastrichtian warming event was defined by a global temperature increase of ~2.5–5 °C that occurred ~150–300 k.y. before the Cretaceous-Paleogene (K-Pg) mass extinction. This transient warming event has traditionally been associated with a major pulse of Deccan Traps (west-central India) volcanism; however, large uncertainties associated with radiogenic dating methods have long hampered a definitive correlation. Here we present a new high-resolution, single species, benthic stable isotope record from the South Atlantic, calibrated to an updated orbitally tuned age model, to provide a revised chronology of the event, which we then correlate to the latest radiogenic dates of the main Deccan Traps eruption phases. Our data reveal that the initiation of deep-sea warming coincides, within uncertainty, with the onset of the main phase of Deccan volcanism, strongly suggesting a causal link. The onset of deep-sea warming is synchronous with a 405 k.y. eccentricity minimum, excluding a control by orbital forcing alone, although amplified carbon cycle sensitivity to orbital precession is evident during the greenhouse warming. A more precise unnderstanding of Deccan-induced climate change paves the way for future work focusing on the fundamental role of these precursor climate shifts in the K-Pg mass extinction.
Barnet , J S K , Littler , K , Kroon , D , Leng , M J , Westerhold , T , Röhl , U & Zachos , J C 2018 , ' A new high-resolution chronology for the late Maastrichtian warming event : establishing robust temporal links with the onset of Deccan volcanism ' , Geology , vol. 46 , no. 2 , pp. 147-150 . https://doi.org/10.1130/G39771.1
Copyright © 2017 The Authors. Gold Open Access: This paper is published under the terms of the CC-BY license.
DescriptionThe new Ocean Drilling Program Site 1262 δ13C and δ18O data were funded by the Natural Environment Research Council Isotope Geosciences Facility at the British Geological Survey (IP-1581–1115). Financial support for this research was provided by the Deutsche Forschungsgemeinschaft (DFG) to Ursula Röhl and Thomas Westerhold.
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