Here you are Richard:
http://www.meteoritestudies.com/protected_TAFASS.HTM
and http://www.impactika.com/nwa5131-tafassasset.pdf
It was last analyzed by Dr Irving and Bunch who explained it to me this
way: It is a CR6 (Carbonaceous-Renazzo) that
went thru a metamorphic event (re-heated, re-crystalized). That makes
it a Meta(morphic) CR6.
That is the short version, read the rest for more detailled information.
A strange meteorite, even in thin-sections.
Anne M. Black
www.IMPACTIKA.com
[email protected]
-----Original Message-----
From: Richard Montgomery <[email protected]>
To: Alan Rubin <[email protected]>; Peter Scherff
<[email protected]>; 'Adam' <[email protected]>
Sent: Mon, Mar 4, 2013 6:14 pm
Subject: Re: [meteorite-list] Type 7 chondrites
What thoughts about Taffessasset in this regard? Anyone wish to chime
in?
Richard M
----- Original Message -----
From: "Alan Rubin" <[email protected]>
To: "Peter Scherff" <[email protected]>; "'Adam'"
<[email protected]>
Sent: Monday, March 04, 2013 3:41 PM
Subject: Re: [meteorite-list] Type 7 chondrites
Most classifiers don't use the type-7 designation because many of the
chondrites that have been called type-7 seem to be impact-melt
breccias.
Most researchers believe that thermal metamorphism probably caused by
asteroidal heating engendered by the decvay of short-lived
radionuclides
like 26-Al heated chondrites from type 3 to 4 to 5 to 6. If shock
was
responsible for causing a rock to be called type 7, then it seemed
more
prudent to just call it shocked and not use the type-7 designation.
Most
researchers believe that the primitive achondrites were also partly
(or
completely) melted by heating caused by the decay of 26-Al. I am not
of
these camps; it seems to me that heating of chondrites from type 3 to
type
6 also results from impact heating and that the primitive achondrites
formed in an analogous way, but that is another story.
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: [email protected]
website: http://cosmochemists.igpp.ucla.edu/Rubin.html
----- Original Message -----
From: "Peter Scherff" <[email protected]>
To: "'Adam'" <[email protected]>
Sent: Monday, March 04, 2013 3:14 PM
Subject: [meteorite-list] Type 7 chondrites
Hi,
Is there any consensus about petrologic type 7 chondrites? Are they
better
classified as Primitive Achondrites? If type 7 is different from
primitive
achondtites what is the line between them?
Thanks,
Peter Scherff
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