[meteorite-list] Ungrouped Achondrite Prices (NWA 7325 andothers)

From: Carl Agee <agee_at_meteoritecentral.com>
Date: Wed, 12 Mar 2014 22:35:21 -0600
Message-ID: <CADYrzhq9cyo+y8RpzbrH1147NZ_Nmg=2eVHrUgG2UY+7cm3RPg_at_mail.gmail.com>

Alan,

Thanks, you just saved me from a savaging by reviewers of my paper
still "in prep"! I guess CK 'precursor' is a safer term than 'parent
body'? Or are we calling it the CV-CK parent body? (with the UCLA good
housekeeping seal of approval). I'm happy with just melting a CV, I
used to do that all the time in the lab, except at very high pressure.

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 Wed, Mar 12, 2014 at 10:26 PM, Alan Rubin <aerubin at ucla.edu> wrote:
> Carl mentioned "a CK parent body." I doubt that there is such a thing. In
> a recent paper, the UCLA folks suggested that CKs were just metamorphosed
> CVs. I wrote a column in Meteorite about that not too long ago as well. If
> this is correct then a CK parent body would really likely be a CV-CK parent
> body. Carl's idea then becomes a little more complicated. Either you have
> to make the achondrite straight from a CV or you have to metamorphose the CV
> material (perhaps by collisions, perhaps by slow heating via 26Al) to make a
> CK and then melt that. It seems simpler to skip the CK step.
> Alan
>
>
> Alan Rubin
> Institute of Geophysics and Planetary Physics
> University of California
> 3845 Slichter Hall
> 603 Charles Young Dr. E
> Los Angeles, CA 90095-1567
> phone: 310-825-3202
> e-mail: aerubin at ucla.edu
> website: http://cosmochemists.igpp.ucla.edu/Rubin.html
>
>
> ----- Original Message ----- From: "Carl Agee" <agee at unm.edu>
> To: "Galactic Stone & Ironworks" <meteoritemike at gmail.com>
> Cc: "Meteorite List" <meteorite-list at meteoritecentral.com>
> Sent: Wednesday, March 12, 2014 9:06 PM
> Subject: Re: [meteorite-list] Ungrouped Achondrite Prices (NWA 7325
> andothers)
>
>
>
>> Hi Mike and All:
>>
>> "Achondrite-ung" one of my favorite things! Also the enigmatic
>> groupings like ACA, LOD, WIN, BRAC, URE, fascinating! From what I have
>> seen and heard about NWA 7325 -- simply amazing. The problem has
>> nothing to do with these wonderful achondrites, the problem is our
>> ignorance of their possible parent bodies. Martian and lunar
>> meteorites are of the highest scientific value, not because they are
>> better meteorites, but because we know enough about their parent
>> bodies to make the meteorite - parent body connection and thereby they
>> become the equivalent of geological sample returns. If NASA hadn't
>> sent missions to the Moon or Mars we would most likely not recognize
>> these meteorites as lunar and Martian. So, the problem with Mercurian
>> meteorites is not whether they do or don't exist, the problem is our
>> fragmentary understanding of the planet Mercury and our inability, at
>> this time, to make the parent body - meteorite connection. Yes,
>> Mercury Messenger has given us new insight into the make up of the
>> Mercurian crust, but the data are simply still not good enough to be
>> useful for unequivocal meteorite matching. So even if we have a
>> meteorite from Mercury somewhere in the world's collections right now,
>> we won't know it until Mercury is better known. Part of the problem is
>> that Mercury possesses no true atmosphere. Remember, the strongest
>> evidence for martian meteorites being from Mars is trapped martian
>> atmospheric gases in the meteorites -- the ultimate fingerprint.
>> Interestingly, we may have a better shot at recognizing a meteorite
>> from Venus, since the Venusian atmosphere has been geochemically and
>> isotopically measured by NASA missions and spectroscopically from
>> Earth. For example, trapped Venusian atmosphere should have a
>> gigantically large ratio of deuterium to hydrogen. In the meantime,
>> there are other ways to think about parent bodies of achondrites --
>> identifying their meteoritic precursor material. For example, I
>> recently worked on achondrite-ung NWA 8186 that appears to be the
>> first example of an achondrite that is a very good match for having a
>> CK-chondrite precursor -- in other words, take a CK parent body,
>> igneously melt it, and the product is achondrite-ung NWA 8186. Hey,
>> who said the list was boring? Mike, great discussion topic!
>>
>> 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 Wed, Mar 12, 2014 at 6:29 PM, Galactic Stone & Ironworks
>> <meteoritemike at gmail.com> wrote:
>>>
>>> Hi Listees,
>>>
>>> Can someone elaborate on why NWA 7325 and it's possible pairings are
>>> selling for $10,000/g in some cases? There is speculation that it
>>> originated from Mercury, but that is only speculation at this point.
>>> One can speculate anything. Heck, it might be from Alpha Centauri.
>>>
>>> There are 60 other ungrouped achondrites and some of them have very
>>> unusual characteristics. Why is NWA 7325 priced so high above the
>>> others? The low-TKW does not explain the price (maybe in small part),
>>> given the fact that pairings appear to be surfacing.
>>>
>>> This is not a criticism of any dealer or dealers. I am just curious
>>> how people have arrived at this price.
>>>
>>> Best regards,
>>>
>>> MikeG
>>>
>>>
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>
Received on Thu 13 Mar 2014 12:35:21 AM PDT