van Ginneke Matthias

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van Ginneke
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Matthias
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  • Article
    An extraterrestrial trigger for the mid-ordovician ice age: Dust from the breakup of the L-chondrite parent body
    (American Association for the Advancement of Science:, 2019-09-18) Schmitz, Birger ; Farley, Kenneth A. ; Goderis, Steven ; Heck, Philipp R. ; Bergstrom, Stig M. ; Boschi, Samuele ; Claeys, Philippe ; Debaille, Vinciane ; Dronov, Andrei ; van Ginneke, 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
    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.