[meteorite-list] Korra Korrabes and Tulia (a)

From: Martin Horejsi <martinh_at_meteoritecentral.com>
Date: Thu Apr 22 09:49:02 2004
Message-ID: <B7D00FD1.2324%martinh_at_isu.edu>

Hello Bernd,

You have a very interesting looking piece of KK. May I post your KK picture
in the Global Collection so others can see it?

You might remember that I posted a large image of my KK slice on the Net at:
http://aristotle.isu.edu/korrakorrabes.jpg

I just looked at the image again, and did not see anything that looked like
an exciting C inclusion among its other hundreds of inclusions and
chrondrules. I read with great interest the article on Kk in MaPS hoping to
gain more insight into my slice.

Also, I hope my slice of Tulia (a) is not a mislabeled Dimmitt because I
have a nice half-kilo Dimmitt already (pictured in the Gallery of the
Meteorite Exchange at:
http://www.meteorite.com/gallery/mh_dimmitti.jpg

Cheers,

Martin








on 9/20/01 1:11 PM, Bernd Pauli HD at
bernd.pauli_at_lehrer1.rz.uni-karlsruhe.de wrote:

> Martin Horejsi wrote:
>
>> The slice is about 60 grams and the
>> inclusion is triangle about 4 mm by 4mm
>
>> http://aristotle.isu.edu/tulia_a_inclusion.jpg
>
>
> Hello Martin, Rhett, and List,
>
> In an 1989 article on carbonaceous material, M.M. Grady
> and co-authors state that some of the unequilibrated ordinary
> chondrites appear to contain an indigenous organic component
> plus show evidence for an amorphous/graphitic component.
> The solar-wind gas-rich breccias Dimmitt and Plainview, but
> not (yet) Tulia (a), are mentioned as showing C-rich clasts.
> In addition, Dimmitt is also reported to contain C-rich
> inclusions/aggregates. As a result of TEM studies, this
> carbon is described as "highly disordered graphite" that
> should be referred to as "poorly-graphitized carbon".
> Some of the Ca-rich aggregates in Dimmitt may even
> contain pre-solar material.
>
> Now could Martin's 60-gram Tulia (a) be a Dimmitt
> because this extraordinary inclusion looks suspiciously
> like the clasts described by M.M. Grady et al. ?
>
> I have a very beautiful 11-gram thinly cut Korra Korrabes
> slice which also exhibits such a dark, trapezoidal clast
> measuring 0.6 x 0.5 x 0.6 x 0.3 cm. It looks like the
> arrow-shaped dark inclusion pictured in L. D. Ashwal's*
> article in MAPS on page 1030 in the 11 o'clock position.
> A very interesting piece that I am very proud of!
>
>
> * ASHWAL L.D. (2001) Korra Korrabes: A new, large H3 chondrite
> breccia from Namibia (MAPS 36-8, 2001, pp. 1027-1038).
>
>
> Best wishes,
>
> Bernd
>
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Received on Thu 20 Sep 2001 11:27:46 PM PDT