[meteorite-list] Chelyabinsk - cosmic-ray exposure age

From: karmaka <karmaka-meteorites_at_meteoritecentral.com>
Date: Tue, 19 Mar 2013 17:17:27 +0100
Message-ID: <1UHzE7-2PEKaO0_at_fwd12.aul.t-online.de>

Or could it be that the radioisotopic chronometer was reset by the second mentioned shock event and
the actual cosmic-ray exposure age is much younger?
 
 
Von: "karmaka" <karmaka-meteorites at t-online.de>
 An: "met-list" <meteorite-list at meteoritecentral.com>
 Betreff: [meteorite-list] Chelyabinsk - cosmic-ray exposure age
 Datum: Tue, 19 Mar 2013 16:56:40 +0100
 
Dear list members,
 
 according to ITAR-TASS the cosmic-ray exposure or ejection age of Chelyabinsk is reported to be
 289 million years, which seems very, very high for a chondrite. Can this be?
 
 Are there other chondrites with such a high exposure age or is this a typo and it is rather 28.9 million years?
 
 http://translate.google.de/translate?sl=ru&tl=en&js=n&prev=_t&hl=de&ie=UTF-8&eotf=1&u=http%3A%2F%2Fwww.itar-tass.com%2Fc9%2F680067.html
 
 What do you think?
 
 Martin
 
 
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Received on Tue 19 Mar 2013 12:17:27 PM PDT