[meteorite-list] KATOL (L6) is official

From: Carl Agee <agee_at_meteoritecentral.com>
Date: Tue, 31 Dec 2013 16:00:12 -0700
Message-ID: <CADYrzhqi8wnGoW8RPmCDrNp0giqwr_GRFALjs-p_VQeLEK2x0w_at_mail.gmail.com>

Jason,

The lab data suggest more than just "L". The low standard deviation on
the Fa and Fs indicate type 5 or 6, with the the faint chondrules and
high Wo we are definitely at type 6. Just because it's hard to see the
chondrules with a petrographic microscope doesn't mean they aren't
there. I hope you aren't suggesting that we go back to optically
determining 2Vs in olivine to get the Fa-content. Electron microprobes
are modern the workhorse for classification, add in oxygen isotopes
and you have it pretty much covered.

Carl

PS: the albitic plagioclase in Katol is OC plag.

*************************************
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 3:39 PM, Jason Utas <meteoritekid at gmail.com> wrote:
> The lab data you (Carl) mention suggests only L, nothing more. No
> one's arguing with that. We had that data months ago.
>
> As I understand it, not one chondrule was observed optically in Katol;
> they were found only when examining BSE images. This would have ruled
> out a chondritic classification prior to the widespread use of SEM's.
> And the fact that we're discussing this now is relevant; no other
> "type 6" chondrite has been metamorphosed to this extent (literally
> invisible chondrules, unless you have a multi-million dollar piece of
> equipment at your disposal).
>
> Since this meteorite doesn't texturally resemble any known L's, having
> been melted and slowly cooled to a poikilitic texture, deeming it an
> L6 is pigeonholing it. Larger-scale heterogeneities resulted in 140
> gram iron meteorites and 200+ gram literally metallic-iron-free
> meteorites with glossy Ca-rich fusion crusts. Such things aren't
> usually glossed over when classifying a meteorite.
>
> It's just like calling Al Haggounia 001 an aubrite, EL6/7, or EL3.
> Just because you can justify a classification with a few parameters
> doesn't make it an accurate descriptor of a meteorite. Which of those
> classifications is best? EL3. Is it right? No. That stone doesn't
> texturally resemble any other (enstatite) chondrites of any kind.
> It's anomalous.
>
> Rather like Katol.
>
> Jason
>
> www.fallsandfinds.com
>
>
> On Tue, Dec 31, 2013 at 11:03 AM, Carl Agee <agee at unm.edu> 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
>>>>>> ______________________________________________
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>>>>>>
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>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Jim Wooddell
>>>>> jim.wooddell at suddenlink.net
>>>>> http://pages.suddenlink.net/chondrule/
>>>>>
>>>>>
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Received on Tue 31 Dec 2013 06:00:12 PM PST