Schmitz, Birger, Farley, Kenneth A., Goderis, Steven, Heck, Philipp R., Bergström, Stig M., Boschi, Samuele, Claeys, Philippe, Debaille, Vinciane, Dronov, Andrei, van Ginneken, Matthias, and others. (2019) An extraterrestrial trigger for the mid-Ordovician ice age: Dust from the breakup of the L-chondrite parent body. Science Advances, 5 (9). eaax4184. ISSN 2375-2548. (doi:10.1126/sciadv.aax4184) (KAR id:88145)
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Official URL: https://doi.org/10.1126/sciadv.aax4184 |
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.
Item Type: | Article |
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DOI/Identification number: | 10.1126/sciadv.aax4184 |
Subjects: |
Q Science > QB Astronomy > QB651 Planets, Minor Q Science > QE Geology > QE515 Geochemistry |
Divisions: | Divisions > Division of Natural Sciences > Physics and Astronomy |
Funders: |
Swedish Research Council (https://ror.org/03zttf063)
Belgian Federal Science Policy Office (https://ror.org/01fapfv42) |
Depositing User: | Matthias Van Ginneken |
Date Deposited: | 14 May 2021 13:51 UTC |
Last Modified: | 05 Nov 2024 12:54 UTC |
Resource URI: | https://kar.kent.ac.uk/id/eprint/88145 (The current URI for this page, for reference purposes) |
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