[meteorite-list] Ad - NWA3118 With Chondrule Field!

From: Marc Fries <m.fries_at_meteoritecentral.com>
Date: Tue Jan 4 11:59:47 2005
Message-ID: <1080.10.17.14.1.1104857983.squirrel_at_webmail.ciw.edu>

Howdy list

   I'm working with an inclusion just like this one in another sample of
NWA 3118, and I'll pitch in here with my impression - it is not a CO
inclusion. This material is a dark inclusion, and the one in the
sample I'm looking at is probably a type B. There are reams of papers
on dark inclusions, but for a good, quick overview have a look at this
one:

   P. Buchanan, M. Zolensky, "Nonporous silicate rims around dark
inclusions in Allende", LPSC XXX Abstract 1830

   This particular inclusion contains porous olivine grains and roughly
spherical, heavily reworked mineral grains that might have been
chondrules once upon a time. They seem to have been both aqueously and
then thermally metamorphosed, and if anyone has a favorite theory on
how they got there I'm all ears.

Cheers,
MDF

> Herbert, List,
>
> I did exactly the same, thus gave an Allende slice with an about 1+ cm
> diameter "dark inclusion" to a representative of the NH Museum in Paris
> about 3 years ago. He said the museum team would be happy to work more on.
> As far as I remember, I did not require a personal answer but mentioned
> that I will be happy to read one day their related publication.
> But we all know how long it can sometimes take for Science to get one
> small
> step forward...
>
> By the way, all my best wishes to all. Should this new year 2005 direct
> (at
> least) one small rock from space to everyone's backyard! Many trades in
> perspective!
>
> Zelimir
>
>
>
>
> A 12:53 04/01/05 +0100, vous avez ?crit :
>
>>I recently donated two pieces of Allende to the Natural History
>>Museum in Vienna: One had a featureless dark inclusion looking
>>similar to the one seen in Rob's NWA 3118 slice featured in the
>>2004 December 1 "Rocks from Space Picture of the Day", and the
>>other one had a inclusion looking silmilar to the "chondrule fild"
>>in the Hupe's NWA3118 slice. Still, the researchers said that this
>>is a "dark inclusion", and did not call it CM or CO xenolith. Any-
>>way, they are working on it either.
>>
>> Herbert Raab
>>
>>
>>
>>______________________________________________
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>
> Prof. Zelimir Gabelica
> Universit? de Haute Alsace
> ENSCMu, Lab. GSEC,
> 3, Rue A. Werner,
> F-68093 Mulhouse Cedex, France
> Tel: +33 (0)3 89 33 68 94
> Fax: +33 (0)3 89 33 68 15
>
>
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>

-- 
Marc Fries
Postdoctoral Research Associate
Carnegie Institution of Washington
Geophysical Laboratory
5251 Broad Branch Rd. NW
Washington, DC 20015
PH:  202 478 7970
FAX: 202 478 8901

Received on Tue 04 Jan 2005 11:59:43 AM PST