[meteorite-list] AD - Do you want a rareandimportantMetachondrite?

From: M come Meteorite Meteorites <mcomemeteorite2004_at_meteoritecentral.com>
Date: Wed Sep 28 14:41:53 2005
Message-ID: <20050928184150.6389.qmail_at_web26202.mail.ukl.yahoo.com>

Ok, but now I ask a clear definition..NWA 1058 its a
acapulcoite? a winonaite? a like winonaite? Its a
chaos...a study say its a acapucloite, another say its
a winonaite, the first analysis say its a acapucloite
like winonaite....

Matteo

--- David Weir <dgweir_at_earthlink.net> ha scritto:

> Hello Satn, whoops make that Stan,
>
> I'd like to refer you to the original abstract in
> which the term
> metachondrite was proposed.
>
>
<http://www.lpi.usra.edu/meetings/metsoc2005/pdf/5218.pdf>
>
> I have also understood the deficiency in the use of
> the term "primitive
> achondrite", so I have gladly adopted the new term
> "metachondrite" on my
> website. It is a meaningful substitute I think, and
> resolves ambiguities
> in the previous terminology.
>
> On the other note which you are discussing, that of
> NWA 1058, I believe
> the evidence is now leaning greatly in favor of this
> being a member of
> the winonaites, so its sale as an acapulcoite
> doesn't seem responsible
> to me anyway. See this abstract to view the new
> diagram comparing 17O to
> olivine Fa content, which has been found to resolve
> these two groups
> when mineralogical data couldn't. NWA 1058 plots
> clearly within the WIN
> field and not the ACA/LOD field:
>
>
<http://www.lpi.usra.edu/meetings/metsoc2005/pdf/5138.pdf
>
> David
>
>
>
> stan . wrote:
> > it's not written in the work of the met soc
> because the term
> > metachonderite DIDNT EXIST when nwa 725 was
> classified... you previously
> > reffered me to David Weir's web site - take a look
> - ALL of the sub
> > types of acapulcoites and winonaites fall under
> the heading of
> > metachonderites - it's a broad term that applies
> to each and every
> > meteorite of that classification - not only
> specific ones.
>
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M come Meteorite - Matteo Chinellato
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Received on Wed 28 Sep 2005 02:41:50 PM PDT