4.8 Article

The Boltysh impact structure: An early Danian impact event during recovery from the K-Pg mass extinction

Journal

SCIENCE ADVANCES
Volume 7, Issue 25, Pages -

Publisher

AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abe6530

Keywords

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Funding

  1. National Environment Research Council [IP/1626/0516]
  2. Natural Sciences and Engineering Research Council of Canada (NSERC PGS-D)
  3. University of Glasgow
  4. Leverhulme Trust [RPG-2018-061]
  5. Science and Technology Facilities Council [ST/N000846/1]

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Both the Chicxulub and Boltysh impact events are associated with the K-Pg boundary, but the Boltysh impact occurred approximately 0.65 million years after the mass extinction, related to the effects of the Chicxulub impact and Deccan trap flood volcanism.
Both the Chicxulub and Boltysh impact events are associated with the K-Pg boundary. While Chicxulub is firmly linked to the end-Cretaceous mass extinction, the temporal relationship of the similar to 24-km-diameter Boltysh impact to these events is uncertain, although it is thought to have occurred 2 to 5 ka before the mass extinction. Here, we conduct the first direct geochronological comparison of Boltysh to the K-Pg boundary. Our 40Ar/39Ar age of 65.39 +/- 0.14/0.16 Ma shows that the impact occurred similar to 0.65 Ma after the mass extinction. At that time, the climate was recovering from the effects of the Chicxulub impact and Deccan trap flood volcanism. This age shows that Boltysh has a close temporal association with the Lower C29n hyperthermal recorded by global sediment archives and in the Boltysh crater lake sediments. The temporal coincidence raises the possibility that even a small impact event could disrupt recovery of the Earth system from catastrophic events.

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