[meteorite-list] KATOL (L6) is official

From: Jason Utas <meteoritekid_at_meteoritecentral.com>
Date: Tue, 31 Dec 2013 15:33:57 -0800
Message-ID: <CABEOBjJQv-fcdYPy57VU3cs0xEBYTaH3Z-h_3Wss9dUZ+wXAMg_at_mail.gmail.com>

Hello Carl, All,
The low standard deviation on Fa and Fs denotes a high degree of
equilibration, not just "5 or 6." "Five or above" would be more
accurate. The nearly absent chondrules and high Wo are at [or beyond]
type 6. If you're a researcher who believes in type 7 chondrites,
since not all do.

Based upon similar observations, one would simply call Al Haggounia
001 an aubrite, or an EL3 if one were lucky enough to find an
unequilibrated chondrule. The textural observations would be
irrelevant. If we looked at other meteorites in a similar fashion,
subgroups and textural designations would disappear.

Since nomenclature blows back and forth, this is something of a
semantic argument; as I understand it, the "poikilitic shergottite"
you recently analyzed would have been a "lherzolite" only a few years
ago, and no amount of discussion then or now would have changed that.
And there is of course variation in analyses. NWA 5205 is paired with
NWA 5421 and our NWA 6501. Which was supposedly paired with NWA 6283.
 Very distinctive material, with classifications ranging from LL3.2 to
LL3.7 to H3.6.

But you did note that the shergottite was poikilitic. So is Katol.
This stone has been metamorphosed in a unique way for a chondrite, and
its classification required a much greater degree of attention because
of that. But the result does not reflect that. Just like Al
Haggounia 001, the "aubrite." It's odd, and I do think that
'pigeonholing' is the right term to use here.

Regards,
Jason

www.fallsandfinds.com


On Tue, Dec 31, 2013 at 2:45 PM, Carl Agee <agee at unm.edu> wrote:
> Mike, Andy, Jim,
>
> I don't have bias one way or another in the case of Katol, but looking
> at the data in the write-up this is a clear-cut L6 chondrite -- no
> ambiguity. There are chondrules albeit highly equilbrated, the
> olivines are L6, the pyroxenes are L6, the oxygen isotopes are
> L-chondrite. If there were no chondrules, high Wo and OC-type olivine
> and pyroxene, then one could make the case for type 7. I'm just going
> by the numbers given in the write-up, I haven't looked at this beyond
> a quick glance in hand specimen, not an achondrite -- period.
>
> Carl
> *************************************
> Carl B. Agee
> Director and Curator, Institute of Meteoritics
> Professor, Earth and Planetary Sciences
> MSC03 2050
> University of New Mexico
> Albuquerque NM 87131-1126
>
> Tel: (505) 750-7172
> Fax: (505) 277-3577
> Email: agee at unm.edu
> http://meteorite.unm.edu/people/carl_agee/
>
>
>
> On Tue, Dec 31, 2013 at 3:19 PM, Michael Farmer <mike at meteoriteguy.com> wrote:
>> I was also under the impression that this was transitional likely between L
>> chondrites and primitive achondrites.
>> Michael Farmer
>>
>> Sent from my iPhone
>>
>> On Dec 31, 2013, at 3:15 PM, Andy Tomkins <rockdocta at gmail.com> wrote:
>>
>> With great respect and just to be a little bit controversial... With a high
>> wollastonite content in the opx like that, sparse remnant chondrules and
>> many of the other features, perhaps this might be a L7? An example of why
>> there needs to be a clearer definition of what defines Type 6 from Type 7?
>>
>> Andy Tomkins
>>
>> On Wednesday, 1 January 2014, Andy Tomkins wrote:
>>>
>>>
>>>
>>> On Wednesday, 1 January 2014, Carl Agee wrote:
>>>
>>> Hi Mike,
>>>
>>> No doubt an interesting meteorite! I guess I should qualify it by
>>> saying the oxygen and the olivine and pyroxene geochem data are garden
>>> variety EOC. I guess looks can be deceiving -- yet another testimony
>>> to lab data being the "blind taste test".
>>>
>>> Carl
>>> *************************************
>>> Carl B. Agee
>>> Director and Curator, Institute of Meteoritics
>>> Professor, Earth and Planetary Sciences
>>> MSC03 2050
>>> University of New Mexico
>>> Albuquerque NM 87131-1126
>>>
>>> Tel: (505) 750-7172
>>> Fax: (505) 277-3577
>>> Email: agee at unm.edu
>>> http://meteorite.unm.edu/people/carl_agee/
>>>
>>>
>>>
>>> On Tue, Dec 31, 2013 at 10:23 AM, Michael Farmer <mike at meteoriteguy.com>
>>> wrote:
>>> > Carl, the huge metal nodules, the large green crystals throughout the
>>> > matrix, very odd meteorites, everyone who looked at it thought it was an
>>> > achondrite, including many scientists.....
>>> > I've never seen an L6 with white matrix and some pieces nearly green
>>> > with crystals.
>>> > Not your garden variety L6 for sure.
>>> > Michael Farmer
>>> >
>>> > Sent from my iPad
>>> >
>>> > On Dec 31, 2013, at 10:14 AM, Carl Agee <agee at unm.edu> wrote:
>>> >
>>> >> Super write-up by Laurence Garvie, but strange that there was so much
>>> >> mystery surrounding what turns out to be garden variety "L6", albeit a
>>> >> nice fresh fall. I wonder why people thought it was "achondrite-ung"?
>>> >> Oxygen and geochem are unequivocal EOC, no mystery at all.
>>> >>
>>> >> Carl Agee
>>> >> *************************************
>>> >> Carl B. Agee
>>> >> Director and Curator, Institute of Meteoritics
>>> >> Professor, Earth and Planetary Sciences
>>> >> MSC03 2050
>>> >> University of New Mexico
>>> >> Albuquerque NM 87131-1126
>>> >>
>>> >> Tel: (505) 750-7172
>>> >> Fax: (505) 277-3577
>>> >> Email: agee at unm.edu
>>> >> http://meteorite.unm.edu/people/carl_agee/
>>> >>
>>> >>
>>> >>
>>> >> On Tue, Dec 31, 2013 at 9:06 AM, Jim Wooddell
>>> >> <jim.wooddell at suddenlink.net> wrote:
>>> >>> Nice GeoChem data. Interesting to see the XFR data included.
>>> >>>
>>> >>>
>>> >>> Happy New Year!
>>> >>>
>>> >>> Jim Wooddell
>>> >>>
>>> >>>
>>> >>>
>>> >>>
>>> >>> On 12/31/2013 8:14 AM, karmaka wrote:
>>> >>>>
>>> >>>> Dear list members,
>>> >>>> Katol is officially listed as an L6 in the Bulletin now!
>>> >>>>
>>> >>>>
>>> >>>>
>>> >>>> http://www.lpi.usra.edu/meteor/metbull.php?sea=Katol&sfor=names&ants=&falls=&valids=&stype=contains&lrec=50&map=ge&browse=&country=All&srt=name&categ=All&mblist=All&rect=&phot=&snew=0&pnt=Normal%20table&code=58500
>>> >>>> Happy new year 2014 to all of you!
>>> >>>> Martin
>>> >>>> ______________________________________________
>>> >>>>
>>> >>>> Visit the Archives at http://www.meteorite-list-archives.com
>>> >>>> Meteorite-list mailing list
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>>> >>>>
>>> >>>>
>>> >>>> -----
>>> >>>> No virus found in this message.
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>>> >>>> Version: 2014.0.4259 / Virus Database: 3658/6963 - Release Date:
>>> >>>> 12/31/13
>>> >>>
>>> >>>
>>> >>>
>>> >>> --
>>> >>> Jim Wooddell
>>> >>> jim.wooddell at suddenlink.net
>>> >>> http://pages.suddenlink.net/chondrule/
>>> >>>
>>> >>>
>>> >>> ______________________________________________
>>> >>>
>>> >>> Vis
> ______________________________________________
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Received on Tue 31 Dec 2013 06:33:57 PM PST