[meteorite-list] Metachondrite ?

From: M come Meteorite Meteorites <mcomemeteorite2004_at_meteoritecentral.com>
Date: Sat Sep 24 06:42:59 2005
Message-ID: <20050924104256.13422.qmail_at_web26210.mail.ukl.yahoo.com>

http://www.lpi.usra.edu/meetings/metsoc2005/pdf/5218.pdf

ah...I have see a news, my NWA 1058 its a
metachondrite.....

Matteo

--- Jeff Kuyken <info_at_meteorites.com.au> ha scritto:

> Hi Martin,
>
> I can certainly see what you are saying but that was
> not really my point. My
> point is that it is not up to us to 'make-up'
> classifications without the
> proper science being done. Admittedly, I've only
> seen a few photos of the
> Caopt Rey pieces and in my opinion the one that was
> just posted by Cartsen
> is certainly a highly shocked piece but it's not an
> IMB. I think if you
> compare them to meteorites like Cat Mountain or Mike
> Farmer's NWA 2085 you
> will see what I mean. That said, it is certainly a
> gorgeous meteorite which
> I wouldn't mind having a piece myself! ;-)
>
> Cheers,
>
> Jeff
>
>
> ----- Original Message -----
> From: Martin Altmann
> To: Jeff Kuyken ;
> meteorite-list_at_meteoritecentral.com
> Sent: Friday, September 23, 2005 8:18 PM
> Subject: Re: [meteorite-list] Capot Rey...photos
> please of the H5
>
>
> Hi Jeff,
>
> as far as I understand the term "IMB" does not name
> a completely and
> uniformly molten rock.
> Else, I would have have problems to understand the
> "B", if there aren't any
> fragments of the precessor material to be found in
> the melt (and I think, we
> easily will sled into the PAC corner).
> Different classification of the same find as IMB or
> H5 f.i. are easily
> explainable. Take for instance Dho 010, there you
> have broad streams of melt
> flowing around chondritic fragments in different
> stages of melting, some
> even unaltered, therefore one can determinate the
> type (have to look Dho 010
> if I remember right is H6).
> And furthermore take our good old Gao! There you
> have stones, which are
> simply more or less normal chondrites, other stones
> show large melt pockets
> and again others are more or less totally molten and
> have to be regarded, if
> one doesn't know about the other average Gao
> specimens, with no doubt as
> IMBs. Take a look on David Weir's page, there you
> have such an example.
> Thus with Gao we have the whole spectra - H5, H5
> with melt, IMB.
> It's always the same, it depends what for a stone
> the classificators get,
> what for sections they do have.
> Remember the NWA 1109, they caught parts with
> slightly below 10% Dio, thus
> it's an EUC-P, another cut, another stone from the
> same find with >10%,
> voila they had to call it a How.
> Take also good old Zag. There exist pieces with only
> a single lithology, if
> those would have been handed in for typing, Zag
> wouldn't have bin classified
> as regolith breccia. Take the NWA-Rumurutis, some
> are nice brecciae,
> result - obviously paired ones (lalalaa I know, I'm
> not a scientist, but if
> it's looking the same in every detail and the stuff
> is so rare) got
> different classifications. Some R4s are paired with
> R3-6...
> Ooops, all I'm writing here, is about the optical,
> physical appearance of
> the stones, not chemically.
>
> Now, I would guess, with Capot Rey, they took either
> a piece without melt
> (if exists) or determinated the type from a not
> molten fragment in the melt.
>
> But look at the phantastic pieces of Carsten, those
> dark fat rivers of melt
> around the grey round jigsaw pieces. Hence if Dho
> 010, who looks the same,
> but is only much more weathered, was called a IMB, I
> dare to say in my
> Lieschen-Mueller-opinion
> (Lieschen Mueller is the German sister of John Doe),
> Capot Rey is an IMB
> too.
>
> Of course again we would need a concretion of terms
> from a qualified mouth.
> With type-7 vs. PAC vs. IMB we learned, that it has
> to do with the isotopes
> and in general nobody is sure about the criteria,
> now we have IMB vs. MR (melt rock) vs H or L with
> IMB vs H or L with visible
> huge parts of melt, but not assigned,
> or we have to resign ourself to being more types of
> rock out there in space
> as we have terms for them :-)
>
> Buckleboo!
> Martin
>
>
> ----- Original Message -----
> From: "Jeff Kuyken" <info_at_meteorites.com.au>
> To: "drtanuki" <drtanuki_at_yahoo.com>;
> <meteorite-list_at_meteoritecentral.com>
> Sent: Friday, September 23, 2005 10:57 AM
> Subject: Re: [meteorite-list] Capot Rey...photos
> please of the H5
>
>
> > I would be a bit cautious about calling something
> an IMB unless it has
> been
> > formally classified as such. My understanding is
> that this meteorite was
> > classified as H5 but after further cutting later
> was found to be highly
> > shocked. Let's not forget that IMB is basically a
> scientific term
> referring
> > to the fact that the pressure reached about 75-90
> GPa and is rated as S6+.
> > It's original shock rating was only S2. A new
> piece should probably be
> > submitted for re-classification so a proper
> determination can be made.
> >
> > Cheers,
> >
> > Jeff
> >
> > ----- Original Message -----
> > From: drtanuki
> > To: meteorite-list_at_meteoritecentral.com
> > Sent: Friday, September 23, 2005 9:47 AM
> > Subject: [meteorite-list] Capot Rey...photos
> please of the H5
> >
> >
> > Dear List,
> > Does anyone have more information about Capot
> Rey?
> > It is listed as an H5 in the MetBul and has no
> mention
> > of it being an IMB. I would appreciate photos if
> > someone has them of their samples that were not
> sold
> > as an IMB. Thank you in advance.
> > Sincerely, Dirk Ross...Tokyo
> >
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Received on Sat 24 Sep 2005 06:42:56 AM PDT