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Middle Ordovician astrochronology decouples asteroid breakup from glacially-induced biotic radiations

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  • Jan Audun Rasmussen

    (Museum Mors
    Natural History Museum of Denmark, University of Copenhagen)

  • Nicolas Thibault

    (University of Copenhagen)

  • Christian Rasmussen

    (GLOBE Institute, University of Copenhagen)

Abstract

Meso-Cenozoic evidence suggests links between changes in the expression of orbital changes and millennia-scale climatic- and biotic variations, but proof for such shifts in orbital cyclicity farther back in geological time is lacking. Here, we report a 469-million-year-old Palaeozoic energy transfer from precession to 405 kyr eccentricity cycles that coincides with the start of the Great Ordovician Biodiversification Event (GOBE). Based on an early Middle Ordovician astronomically calibrated cyclostratigraphic framework we find this orbital change to succeed the onset of icehouse conditions by 200,000 years, suggesting a climatic origin. Recently, this icehouse was postulated to be facilitated by extra-terrestrial dust associated with an asteroid breakup. Our timescale, however, shows the meteor bombardment to post-date the icehouse by 800,000 years, instead pausing the GOBE 600,000 years after its initiation. Resolving Milankovitch cyclicity in deep time thus suggests universal orbital control in modulating climate, and maybe even biodiversity accumulation, through geological time.

Suggested Citation

  • Jan Audun Rasmussen & Nicolas Thibault & Christian Rasmussen, 2021. "Middle Ordovician astrochronology decouples asteroid breakup from glacially-induced biotic radiations," Nature Communications, Nature, vol. 12(1), pages 1-14, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26396-4
    DOI: 10.1038/s41467-021-26396-4
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    References listed on IDEAS

    as
    1. Helen K. Coxall & Paul A. Wilson & Heiko Pälike & Caroline H. Lear & Jan Backman, 2005. "Rapid stepwise onset of Antarctic glaciation and deeper calcite compensation in the Pacific Ocean," Nature, Nature, vol. 433(7021), pages 53-57, January.
    2. Jan A. van Dam & Hayfaa Abdul Aziz & M. Ángeles Álvarez Sierra & Frederik J. Hilgen & Lars W. van den Hoek Ostende & Lucas J. Lourens & Pierre Mein & Albert J. van der Meulen & Pablo Pelaez-Campomanes, 2006. "Long-period astronomical forcing of mammal turnover," Nature, Nature, vol. 443(7112), pages 687-691, October.
    3. Philipp R. Heck & Birger Schmitz & Heinrich Baur & Alex N. Halliday & Rainer Wieler, 2004. "Fast delivery of meteorites to Earth after a major asteroid collision," Nature, Nature, vol. 430(6997), pages 323-325, July.
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