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Orgueil and Comets - Follow-up
- To: meteorite-list@meteoritecentral.com
- Subject: Orgueil and Comets - Follow-up
- From: Bernd Pauli <bernd.pauli@lehrer1.rz.uni-karlsruhe.de>
- Date: Fri, 03 Jul 1998 17:56:12 +0200
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- Resent-Date: Fri, 3 Jul 1998 12:34:20 -0400 (EDT)
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Matt Morgan schrieb:
> This is not only due the high water content (~20%?)
Only 5 CI specimens are known:
Alais - Ivuna - Orgueil - Revelstoke - Tonk
There is o n e Japanese Antarctic meteorite in my database that may
belong to the CI group:
Yamato 82162
but it seems to have unusual characteristics:
K.Yamamoto et al. (1990) REE characteristics of Yamato 82162 and Yamato
86720 meteorites and their inference to classification (Proc. NIPR Symp.
Antarct. Mets. 3rd, 69-79).
A. Bischoff et al. (1991) Mineralogy and petrography of the a n o m a l
o u s carbonaceous chondrites Yamato 86720, Yamato 82162 and Belgica
7904 (Proc. NIPR Symp. Antarct. Mets. 4th, 226-246).
M. Zolensky et al. (1991) Mineralogy and thermal history of Yamato
82162, Yamato 86720 and Belgica 7904 (abs. Symp. Antarct. Mets. 16th,
195-196).
Surprisingly, my US Antarctic database doesn't have any CI or C1
carbonaceous chondrites at all!
EET 83334 is classified as CM1-2 and does not belong here.
According to A.E. RUBIN [Mineralogy of meteorite groups (Meteoritics
32-2, 1997, 231)], the CI carbonaceous chondrites are chondrule-free and
volatile-rich whereas CM carbonaceous chondrites are
minichondrule-bearing.
Best wishes from Germany,
Bernd
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