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

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Middle Ordovician astrochronology decouples asteroid breakup from glacially-induced biotic radiations. / Rasmussen, Jan Audun; Thibault, Nicolas; Mac Ørum Rasmussen, Christian.

In: Nature Communications, Vol. 12, No. 1, 6430, 12.2021.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Rasmussen, JA, Thibault, N & Mac Ørum Rasmussen, C 2021, 'Middle Ordovician astrochronology decouples asteroid breakup from glacially-induced biotic radiations', Nature Communications, vol. 12, no. 1, 6430. https://doi.org/10.1038/s41467-021-26396-4

APA

Rasmussen, J. A., Thibault, N., & Mac Ørum Rasmussen, C. (2021). Middle Ordovician astrochronology decouples asteroid breakup from glacially-induced biotic radiations. Nature Communications, 12(1), [6430]. https://doi.org/10.1038/s41467-021-26396-4

Vancouver

Rasmussen JA, Thibault N, Mac Ørum Rasmussen C. Middle Ordovician astrochronology decouples asteroid breakup from glacially-induced biotic radiations. Nature Communications. 2021 Dec;12(1). 6430. https://doi.org/10.1038/s41467-021-26396-4

Author

Rasmussen, Jan Audun ; Thibault, Nicolas ; Mac Ørum Rasmussen, Christian. / Middle Ordovician astrochronology decouples asteroid breakup from glacially-induced biotic radiations. In: Nature Communications. 2021 ; Vol. 12, No. 1.

Bibtex

@article{5aa010274d6a4f55ad3e5075589ffff1,

title = "Middle Ordovician astrochronology decouples asteroid breakup from glacially-induced biotic radiations",

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.",

author = "Rasmussen, {Jan Audun} and Nicolas Thibault and {Mac {\O}rum Rasmussen}, Christian",

note = "Publisher Copyright: {\textcopyright} 2021, The Author(s).",

year = "2021",

month = dec,

doi = "10.1038/s41467-021-26396-4",

language = "English",

volume = "12",

journal = "Nature Communications",

issn = "2041-1723",

publisher = "nature publishing group",

number = "1",

}

RIS

TY - JOUR

T1 - Middle Ordovician astrochronology decouples asteroid breakup from glacially-induced biotic radiations

AU - Rasmussen, Jan Audun

AU - Thibault, Nicolas

AU - Mac Ørum Rasmussen, Christian

PY - 2021/12

Y1 - 2021/12

N2 - 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.

AB - 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.

U2 - 10.1038/s41467-021-26396-4

DO - 10.1038/s41467-021-26396-4

M3 - Journal article

C2 - 34741034

AN - SCOPUS:85118527331

VL - 12

JO - Nature Communications

JF - Nature Communications

SN - 2041-1723

IS - 1

M1 - 6430

ER -

ID: 284773483

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