气候变化领域集成服务门户(CCPortal): Middle Ordovician astrochronology decouples asteroid breakup from glacially-induced biotic radiations

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DOI	10.1038/s41467-021-26396-4
	Middle Ordovician astrochronology decouples asteroid breakup from glacially-induced biotic radiations
	Rasmussen J.A.; Thibault N.; Mac Ørum Rasmussen C.
发表日期	2021
ISSN	2041-1723
卷号	12 期号:1
英文摘要	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. © 2021, The Author(s).
语种	英语
scopus关键词	asteroid; Cenozoic; chronology; cyclicity; eccentricity; geological time; glacial environment; meteor; Ordovician; Paleozoic; article; astronomy; biodiversity; climate; energy transfer; Middle Ordovician; biodiversity; evolution; fossil; Asteroidea; Biodiversity; Biological Evolution; Fossils
来源期刊	Nature Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/251319
作者单位	Museum Mors, Skarrehagevej 8, Nykøbing Mors, DK-7900, Denmark; Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5–7, Copenhagen K, DK-1350, Denmark; Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, Copenhagen K, DK-1350, Denmark; GLOBE Institute, University of Copenhagen, Øster Voldgade 5–7, Copenhagen K, DK-1350, Denmark
推荐引用方式 GB/T 7714	Rasmussen J.A.,Thibault N.,Mac Ørum Rasmussen C.. Middle Ordovician astrochronology decouples asteroid breakup from glacially-induced biotic radiations[J],2021,12(1).
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).
MLA	Rasmussen J.A.,et al."Middle Ordovician astrochronology decouples asteroid breakup from glacially-induced biotic radiations".Nature Communications 12.1(2021).