[meteorite-list] Grein 004/Tafassasset

From: Impactika at aol.com <Impactika_at_meteoritecentral.com>
Date: Wed, 26 Nov 2008 13:55:32 EST
Message-ID: <d27.1f1adc88.365ef5a4_at_aol.com>

Hello Zelimir, Norbert and all,

In a very recent conversation Tony Irving told me that he was re-doing the
classification of Tafassasset with Ted Bunch, and that the results would be
published in a formal paper. I belive they are practically done so the new
classification should be announced pretty soon.
And it is not bracchinite or CR6, and it is very interesting, but I would
prefer to let them tell the story themselves.

More soon.
 
Anne M. Black
_http://www.impactika.com/_ (http://www.impactika.com/)
_IMPACTIKA at aol.com_ (mailto:IMPACTIKA at aol.com)
Vice-President, I.M.C.A. Inc.
_http://www.imca.cc/_ (http://www.imca.cc/)



In a message dated 11/26/2008 9:52:23 AM Mountain Standard Time,
Zelimir.Gabelica at uha.fr writes:
Hi Norbert, Bernd, Harald, List,

Thank you very much for the info about "Grein 004/Tenere 001/Tafa".
I indeed read that somewhere sometimes but I have not my archives on hand
here in France (BM Met. Catalog (Grady) indeed currently gives most of the
meteorite synonyms).

Bernd said:

"Grein 004" as well as "Tenere 001" are just synonyms for the
Tafassasset Freiburg mass, a single stone weighing 3610 grams.
It's no pairing.

Bernd, Norbert, does that mean that the tkw for Tafassasset is then 110 kg
(Franch find) + 3.61 kg ("Grein 004") = 113.61 kg ? (thus 27 at 113.61kg and
not 26 at 110 kg as in "A to Z" ?).
Met. Bull. indeed reports the tkw as 114 kg (approx), which well fits the
figure.

The official type so far is CR-an (Met. Bull.), or PAUNGR ("A to Z"). Do
you agree ?
I know that both meteorites were studied separately and that the real type
could not be defined.

Note that Weir (his web site) reports, for T-1 (= Tenere 001), a total
weight of exactly 3.636 kg, also that is "brachinite-related" and that Tafa
itself (separately listed by Weir but said being paired with T-1) is a
"PAUNGR, possibly CR-related".
More recent studies seem to still question that CR-relation...

I understand the real type is yet to be defined and that the tkw is close
to 27 at 114 kg, more specifically 12 at 113.636 kg

Norbert, do you think Prof Otto knows more on that or whether they continue
to study this meteorite in Freiburg ?

And Bernd, what you mean by "it's no pairing" ? Everybody seems to agree so
far that the "Freiburg mass" is also Tafa. (?)

All my best,

Zelimir


A 12:19 26/11/2008 +0100, vous avez ?crit :
>Hi Zelimir,
>
>I don't know for NWA 3144, but "Grein 004" is a synonym for Tafassasset -
>I'm pretty sure of that. "Grein 004" was a working name used for the smaller
>mass which was later named as the Tafassasset "Freiburg mass", classified
>and studied by my friend Dr. Otto in Freiburg. You might want to contact
>Juergen Otto in this matter, just to make sure - he can be reached at
>Juergen.Otto at minpet.uni-freiburg.de
>
>Hope this helps...
>
>All the best,
>Norbert
>

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Received on Wed 26 Nov 2008 01:55:32 PM PST