SciCombinator

Discover the most talked about and latest scientific content & concepts.

B Schmitz, QZ Yin, ME Sanborn, M Tassinari, CE Caplan and GR Huss
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.
Tweets*
148
Facebook likes*
15
Reddit*
0
News coverage*
103
Blogs*
8
SC clicks
0
Concepts
Chondrite, Asteroid belt, Comet, Iron, Asteroid, Mars, Impact event, Meteorite
MeSH headings
-
comments powered by Disqus

* Data courtesy of Altmetric.com