A fossil winonaite-like meteorite in Ordovician limestone : a piece of the impactor that broke up the L-chondrite parent body?
Huss, Gary R.
Meier, Matthias M. M.
Church, Ross P.
Davies, Melvyn B.
Heck, Philipp R.
Ravizza, Gregory E.
MetadataShow full item record
KeywordFossil meteorite; Asteroid breakup; Winonaite; Ordinary chondrite; Asteroid family; Meteorite flux
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.
© The Author(s), 2014. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Earth and Planetary Science Letters 400 (2014): 145-152, doi:10.1016/j.epsl.2014.05.034.
The following license files are associated with this item:
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 Unported
Showing items related by title, author, creator and subject.
Ancient DNA derived from alkenone-biosynthesizing haptophytes and other algae in Holocene sediments from the Black Sea Coolen, Marco J. L.; Boere, Arjan C.; Abbas, Ben; Baas, Marianne; Wakeham, Stuart G.; Sinninghe Damste, Jaap S. (American Geophysical Union, 2006-02-18)Holocene sea surface temperatures (SST) of the Black Sea have been reconstructed using sedimentary C37 unsaturated alkenones assumed to be derived from the coccolithophorid haptophyte Emiliania huxleyi, whose fossil ...
Environmental contaminants activate human and polar bear (Ursus maritimus) pregnane X receptors (PXR, NR1I2) differently Lille-Langoy, Roger; Goldstone, Jared V.; Rusten, Marte; Milnes, Matthew R.; Male, Rune; Stegeman, John J.; Blumberg, Bruce; Goksoyra, Anders (Elsevier, 2015-02-10)Many persistent organic pollutants (POPs) accumulate readily in polar bears because of their position as apex predators in Arctic food webs. The pregnane X receptor (PXR, formally NR1I2, here proposed to be named promiscuous ...
Vertical flux, ecology and dissolution of radiolaria in tropical oceans : implications for the silica cycle Takahashi, Kozo (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1981-11)Radiolarians which settle through the oceanic water column were recovered from three stations (western Tropical Atlantic-Station E, central Tropical Pacific-Pi and Panama Basin-PB) using PARLUX sediment traps in moored ...