Terfelt Fredrik

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Terfelt
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Fredrik
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  • Article
    A fossil winonaite-like meteorite in Ordovician limestone : a piece of the impactor that broke up the L-chondrite parent body?
    (Elsevier, 2014-06-06) Schmitz, Birger ; Huss, Gary R. ; Meier, Matthias M. M. ; Peucker-Ehrenbrink, Bernhard ; Church, Ross P. ; Cronholm, Anders ; Davies, Melvyn B. ; Heck, Philipp R. ; Johansen, Anders ; Keil, Klaus ; Kristiansson, Per ; Ravizza, Gregory E. ; Tassinari, Mario ; Terfelt, Fredrik
    About a quarter of all meteorites falling on Earth today originate from the breakup of the L-chondrite parent body ∼470 Ma∼470 Ma ago, the largest documented breakup in the asteroid belt in the past ∼3 Ga∼3 Ga. A window into the flux of meteorites to Earth shortly after this event comes from the recovery of about 100 fossil L chondrites (1–21 cm in diameter) in a quarry of mid-Ordovician limestone in southern Sweden. Here we report on the first non-L-chondritic meteorite from the quarry, an 8 cm large winonaite-related meteorite of a type not known among present-day meteorite falls and finds. The noble gas data for relict spinels recovered from the meteorite show that it may be a remnant of the body that hit and broke up the L-chondrite parent body, creating one of the major asteroid families in the asteroid belt. After two decades of systematic recovery of fossil meteorites and relict extraterrestrial spinel grains from marine limestone, it appears that the meteorite flux to Earth in the mid-Ordovician was very different from that of today.
  • 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.