[meteorite-list] Type 7 chondrites

From: Anne Black <impactika_at_meteoritecentral.com>
Date: Mon, 4 Mar 2013 21:28:19 -0500 (EST)
Message-ID: <8CFE7603C41A715-1B80-D2223_at_webmail-d075.sysops.aol.com>

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
IMPACTIKA at aol.com


-----Original Message-----
From: Richard Montgomery <rickmont at earthlink.net>
To: Alan Rubin <aerubin at ucla.edu>; Peter Scherff
<PeterScherff at rcn.com>; 'Adam' <meteorite-list at meteoritecentral.com>
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" <aerubin at ucla.edu>
To: "Peter Scherff" <PeterScherff at rcn.com>; "'Adam'"
<meteorite-list at meteoritecentral.com>
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: aerubin at ucla.edu
> website: http://cosmochemists.igpp.ucla.edu/Rubin.html
>
>
> ----- Original Message -----
> From: "Peter Scherff" <PeterScherff at rcn.com>
> To: "'Adam'" <meteorite-list at meteoritecentral.com>
> 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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Received on Mon 04 Mar 2013 09:28:19 PM PST