Tracy Latimer 7/8/2020 3:35:07 PM |
I'm still pleased I have a slice in my collection. |
Bernd Pauli 7/6/2020 3:46:21 PM |
T.E. Bunch once called it a metachondrite. |
Stephan Kambach 7/6/2020 2:05:54 PM |
The relict chondrules are not the criterion for confirmation and reasoning for a CR classification. Primitive achondrites can generally contain relict chondrules. Above all it was important to find triple junctions / 120 * grain boundaries. The noble gas analyzes also played a role. There were and are a lot of other reasons, which ultimately also resulted from human misconduct around the time of the classification, but I do not want to mention them here anymore. To do this, one would have to ask the participants directly; perhaps these are now ready for an objective statement. For my poor understanding, the primitive achondrite is more realistic as the classifications. |
Paladino vincenzino 7/6/2020 1:52:37 PM |
perhaps a partial fusion within the parent body |
Paladino vincenzino 7/6/2020 1:38:32 PM |
thanks for your comments, of course one thing is sure .TAFASSASSET will never cease to surprise us |
Anne Black 7/6/2020 1:02:17 PM |
Good old Tafassasset, the trouble maker. Yes I know that it has been re-classified one more time! as an achondrite. The problem with that is that thin-sections do show relict chondrules. Yes, "relict", but chondrules nethertheless. I still believe that the classification as related to CR is correct. Thank you Bernd. |
John Divelbiss 7/6/2020 11:08:49 AM |
a fragment of this stuff is a truly "out of this world" looking stone! I will share pics of one...on another day. :) |
Paladino vincenzino 7/6/2020 10:28:15 AM |
very mysterious meteorite, surely in the future it will reveal more secrets |
Bernd Pauli 7/6/2020 9:56:56 AM |
Although, on the other hand, there is a MAPS article published in 2019 where the authors still speak of "related to CR chondrites". here is the article: ABE D. et al. (2019) Mineralogical Comparison of Northwest Africa 7317 and Tafassasset: Two Equilibrated Rocks Related to CR Chondrites (MAPS 54, 2019). |
MPOD 7/6/2020 9:14:06 AM |
Thanks for pointing that out Stephan.
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Stephan Kambach 7/6/2020 7:28:28 AM |
In the meteoritical bulletin see the proposed classification; also under MB 104: primitive achondrite.
Tafassasset has not been CR-an for a long time already. Reclassification |
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