A new type of solar-system material recovered from Ordovician marine limestone

B. Schmitz (), Q. -Z. Yin, M. E. Sanborn, M. Tassinari, C. E. Caplan and G. R. Huss
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B. Schmitz: Astrogeobiology Laboratory, Lund University
Q. -Z. Yin: University of California at Davis
M. E. Sanborn: University of California at Davis
M. Tassinari: Astrogeobiology Laboratory, Lund University
C. E. Caplan: Hawai'i Institute of Geophysics and Planetology, University of Hawai'i at Manoa
G. R. Huss: Hawai'i Institute of Geophysics and Planetology, University of Hawai'i at Manoa

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract From mid-Ordovician ∼470 Myr-old limestone >100 fossil L-chondritic meteorites have been recovered, representing the markedly enhanced flux of meteorites to Earth following the breakup of the L-chondrite parent body. Recently one anomalous meteorite, Österplana 065 (Öst 65), was found in the same beds that yield L chondrites. The cosmic-ray exposure age of Öst 65 shows that it may be a fragment of the impactor that broke up the L-chondrite parent body. Here we show that in a chromium versus oxygen-isotope plot Öst 65 falls outside all fields encompassing the known meteorite types. This may be the first documented example of an ‘extinct’ meteorite, that is, a meteorite type that does not fall on Earth today because its parent body has been consumed by collisions. The meteorites found on Earth today apparently do not give a full representation of the kind of bodies in the asteroid belt ∼500 Myr ago.

Date: 2016
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DOI: 10.1038/ncomms11851

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