Birger Schmitz
An extraterrestrial trigger for the mid-Ordovician ice age: Dust from the breakup of the L-chondrite parent body
Schmitz, Birger; Farley, Kenneth A.; Goderis, Steven; Heck, Philipp R.; Bergström, Stig M.; Boschi, Samuele; Claeys, Philippe; Debaille, Vinciane; Dronov, Andrei; van Ginneken, Matthias; Harper, David A.T.; Iqbal, Faisal; Friberg, Johan; Liao, Shiyong; Martin, Ellinor; Meier, Matthias M.M.; Peucker-Ehrenbrink, Bernhard; Soens, Bastien; Wieler, Rainer; Terfelt, Fredrik
Authors
Kenneth A. Farley
Steven Goderis
Philipp R. Heck
Stig M. Bergström
Samuele Boschi
Philippe Claeys
Vinciane Debaille
Andrei Dronov
Matthias van Ginneken
Professor David Harper david.harper@durham.ac.uk
Emeritus Professor
Faisal Iqbal
Johan Friberg
Shiyong Liao
Ellinor Martin
Matthias M.M. Meier
Bernhard Peucker-Ehrenbrink
Bastien Soens
Rainer Wieler
Fredrik Terfelt
Abstract
The breakup of the L-chondrite parent body in the asteroid belt 466 million years (Ma) ago still delivers almost a third of all meteorites falling on Earth. Our new extraterrestrial chromite and 3He data for Ordovician sediments show that the breakup took place just at the onset of a major, eustatic sea level fall previously attributed to an Ordovician ice age. Shortly after the breakup, the flux to Earth of the most fine-grained, extraterrestrial material increased by three to four orders of magnitude. In the present stratosphere, extraterrestrial dust represents 1% of all the dust and has no climatic significance. Extraordinary amounts of dust in the entire inner solar system during >2 Ma following the L-chondrite breakup cooled Earth and triggered Ordovician icehouse conditions, sea level fall, and major faunal turnovers related to the Great Ordovician Biodiversification Event.
Citation
Schmitz, B., Farley, K. A., Goderis, S., Heck, P. R., Bergström, S. M., Boschi, S., …Terfelt, F. (2019). An extraterrestrial trigger for the mid-Ordovician ice age: Dust from the breakup of the L-chondrite parent body. Science Advances, 5(9), Article eaax4184. https://doi.org/10.1126/sciadv.aax4184
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 21, 2019 |
Online Publication Date | Sep 18, 2019 |
Publication Date | Sep 18, 2019 |
Deposit Date | Sep 20, 2019 |
Publicly Available Date | Sep 20, 2019 |
Journal | Science Advances |
Electronic ISSN | 2375-2548 |
Publisher | American Association for the Advancement of Science |
Peer Reviewed | Peer Reviewed |
Volume | 5 |
Issue | 9 |
Article Number | eaax4184 |
DOI | https://doi.org/10.1126/sciadv.aax4184 |
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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/
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