Even if the term "metachondrite" comes into use, it will not be the
name of a meteorite group. It is semantically similar to the terms
chondrite and achondrite, which are descriptive of the overall texture
of a rock. Each of these terms encompasses objects from many parent
bodies. And please don't think that the term "primitive achondrite" is
incoherent. It is a very well-defined term, with an abundant scientific
literature behind it. In fact, Irving et al. (metsoc abstract) suggest
that metachondrite is essentially a synonym for PAC! Nor is the term
"ungrouped" incoherent. This is a very precise term, meaning that the
meteorite does not belong to an accepted group. If one adopts the term
metachondrite, expect there to be metachondrite-ung classifications
appearing.
Jeff
On 10/21/2010 9:57 AM, Martin Altmann wrote:
Hi,
Time will tell if it catches on.
I suppose it will,
because to list these stones as Achondrite-ungr or Achondrite-prim. is very
unspecific
(and as far as I can rate it as a sheer layman, also sometimes somewhat
misleading),
while the metachondrite concept is very coherent.
Of course it can take some time.
(If you remember e.g. that the Bulletin still has with the lunaites only the
very coarse discrimination in LUN-A and LUN-B, as we would still be in the
time, where there were only the 2 DaGs and NWA 032.)
Btw. these new results and that interesting topic about the additional
7ers/chondritic PACs/Metachondrites came on the table or was incited, as
far as I can see, only and solely by means of newly found stones from the
hot deserts.
Hence another perfect example, why all, also in the MetSoc, should take care
for keeping the deserts open.
It helps a lot!
Best!
Martin
-----Ursprüngliche Nachricht-----
Von: meteorite-list-boun...@meteoritecentral.com
[mailto:meteorite-list-boun...@meteoritecentral.com] Im Auftrag von Jeff
Grossman
Gesendet: Donnerstag, 21. Oktober 2010 15:02
An: meteorite-list@meteoritecentral.com
Betreff: Re: [meteorite-list] metachondrite
This is a term coined by Ted Bunch and Tony Irving, but to my
knowledge there is no peer-reviewed publication defining the term.
You'll find the definition in an AGU and a MetSoc abstract:
http://www.lpi.usra.edu/meetings/metsoc2005/pdf/5218.pdf
http://adsabs.harvard.edu/abs/2006AGUFM.P51E1246B
The term is not in widespread use and has not been used in the
Meteoritical Bulletin. Time will tell if it catches on.
Jeff
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