Jason and List,
Actually Tafassasset matches closely to Renazzo(CR2) w.r.t. oxygen isotopes.
See the paper "TAFASSASSET: AN EQUILIBRIATED CR CHONDRITE"
http://www.lpi.usra.edu/meetings/lpsc2002/pdf/1611.pdf
That said, subsequent papers do argue that Tafassasset is more like a
Brachinite.
http://www.lpi.usra.edu/meetings/lpsc2003/pdf/1370.pdf
This paper does go on to say that perhaps Tafassasset is a brachinite whose
parent body was different from most other brachinites and perhaps its parent
body was composed of CR chondrite-like material.
Also see:
http://www.lpi.usra.edu/meetings/lpsc2007/pdf/2086.pdf
Cheers,
Mike Tettenborn
----- Original Message -----
From: "Jason Utas" <[EMAIL PROTECTED]>
To: "tett" <[EMAIL PROTECTED]>
Sent: Sunday, May 13, 2007 9:46 PM
Subject: Re: [meteorite-list] TAFASSASSET? Ay new info?
Hello Mike,
Well, it's not an equilibrated CR - the oxygen isotope plots are in
the H-chondrite range...as far as I know, dealers were just putting
that out there to move it, because that's been known for a good while.
Chemically it's...kind of....similar to a CR (if you want it to be,
you could say it was, I suppose), but as far as I can tell, it's
really just 'ungrouped' in nearly every sense of the word.
Regards,
Jason
On 5/13/07, tett <[EMAIL PROTECTED]> wrote:
Hello List!
Was wondering if there was any new information available, including new
research results, on Tafassasset.
I was fortunate in aquiering a nice slice and am now curious on where
this
meteortie stands. The met. base still gives this a dual listing of both
a
CR Chondrite and a Primative Achondrite (PAC). Are there any new
arguments
which point to which classification is correct?
Cheers and Thanks,
Mike Tettenborn
Owen Sound, Ontario, Canada
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