Refined Ordovician timescale reveals no link between asteroid breakup and biodiversification

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

The catastrophic disruption of the L chondrite parent body in the asteroid belt c. 470 Ma initiated a prolonged meteorite bombardment of Earth that started in the Ordovician and continues today. Abundant L chondrite meteorites in Middle Ordovician strata have been interpreted to be the consequence of the asteroid breakup event. Here we report a zircon U-Pb date of 467.50±0.28 Ma from a distinct bed within the meteorite-bearing interval of southern Sweden that, combined with published cosmic-ray exposure ages of co-occurring meteoritic material, provides a precise age for the L chondrite breakup at 468.0±0.3 Ma. The new zircon date requires significant revision of the Ordovician timescale that has implications for the understanding of the astrogeobiologic development during this period. It has been suggested that the Middle Ordovician meteorite bombardment played a crucial role in the Great Ordovician Biodiversification Event, but this study shows that the two phenomena were unrelated.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • University of Copenhagen
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Geologi
Originalspråkengelska
Artikelnummer14066
TidskriftNature Communications
Volym8
StatusPublished - 2017 jan 24
PublikationskategoriForskning
Peer review utfördJa

Relaterad forskningsoutput

Anders Lindskog, 2017 feb, Lund: Lund University, Faculty of Science, Department of Geology, Lithosphere and Biosphere Science. 132 s.

Forskningsoutput: AvhandlingDoktorsavhandling (sammanläggning)

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