[meteorite-list] Metachondrite(s)

From: Impactika at aol.com <Impactika_at_meteoritecentral.com>
Date: Thu, 21 Oct 2010 03:15:04 EDT
Message-ID: <c44fe.3d0c9ab7.39f14278_at_aol.com>

Thank you Bernd,
 
Yes a metachondrite is a meta(morphic) chondrite, nothing to do with
lithologies.
A good example of a CR Meta-chondrite is of course Tafassasset.
 
Goodnight.
 
Anne M. Black
_www.IMPACTIKA.com_ (http://www.IMPACTIKA.com)
_IMPACTIKA at aol.com_ (mailto:IMPACTIKA at aol.com)
President of IMCA
_www.IMCA.cc_ (http://www.IMCA.cc)
 
 
 
In a message dated 10/21/2010 12:36:46 AM Mountain Daylight Time,
bernd.pauli at paulinet.de writes:
Good morning Steve, Greg and List,

Greg S. wrote: "I understand a metachondrite to be a chondrite that has
undergone
metamorphism resulting in recrystalization. The composition is much the
same as
in the original chondrite. There are different affinities, such as 'H' 'L'
or 'LL'.
I think there are others including E's and 'C' chondrites."

That's right. One further, important aspect is that they are all virtually
without
(relic) chondrules, devoid of chondrules with a few minor exceptions. See
here:

http://www4.nau.edu/meteorite/Meteorite/Metachondrites.html#En

Best morning wishes,

Bernd

Anne M. Black
http://www.impactika.com/
IMPACTIKA at aol.com
Vice-President, I.M.C.A. Inc.
http://www.imca.cc/
Received on Thu 21 Oct 2010 03:15:04 AM PDT