[meteorite-list] Exciting News from Norway

From: Matson, Robert <ROBERT.D.MATSON_at_meteoritecentral.com>
Date: Mon Jul 31 18:42:04 2006
Message-ID: <A8044CCD89B24B458AE36254DCA2BD07A4ECBC_at_0005-its-exmp01.us.saic.com>

Hi Geoff and List,

Thanks for forwarding the news of the success of the Mike-Morton-Robert
team in Norway. The small chondrule size mentioned by Mike would tend
to rule out the vast majority of chondrite types: CV, LL, CR, CK, L,
EL and K chondrites all have mean chondrule diameters greater than
500 microns. However, CO chondrules are tiny with average chondrule
size in the 150-micron range (0.15 mm). (The only carbonaceous
chondrite
with smaller chondrules is CH -- and these are much, much smaller --
20 microns.) Unless Mike is saying that the chondrules are quite a bit
smaller than a half-millimeter, it would seem that CM is a better match
(mean diameter ~300 microns). Marcin, Matteo and Marco (3Ms): your
guesses are looking better! (P.S. Did your first names have any
influence
on your CM guess? ;-)

EH, H and rumurutiites also have mean chondrules sizes in the 200-400
micron range, but Mike has seen enough meteorites that he should be
able to rule out these types. --Rob
Received on Mon 31 Jul 2006 06:41:40 PM PDT