Hello Bernd,
I have read different stats for the kakangariites than you have stated.
My sources are Classification of Meteorites, Krot, Keil, Goodrich,
Scott, and Weisberg (from Treatise on Geochemistry 1, 2005); The K
chondrite grouplet, Weisberg, Prinz, Clayton, Mayeda, Grady Franchi,
Pillinger, and Kallemeyn (GCA 1996); and The Textures and Abundances of
Chondrules in the Kakangari Chondrite, Genge and Grady (LPSC 24 #1670).
Newer information has discredited Lea Co 002 from being a member of this
grouplet, so now there are only Kakangari and LEW 87232 - perhaps that
has skewed some numbers you referenced. Here are my stats for features
of these two members which can be measured outside of the lab for the
most part:
chondrule size peak is 0.25-0.5 mm
70-77 vol% matrix content
metal content similar to H chondrites (6-9 vol%)
sulfides 6-10 vol%
CAIs less than 0.1 vol% (0.05 - 0.4 mm)
D17O (when conducted) should be -1.6
The high metal (as indicated by the numerous rust spots) is unlike that
of a CK I think. I haven't investigated its similarity to COs since that
is the ongoing hypothesis of its class and I can live with that.
Obviously it will take a lab to know what Moss is, but a kakangariite is
not out of the running in my opinion.
David
[EMAIL PROTECTED] wrote:
...
There is not very much I can say about the Moss meteorite as I don't
know it in person - I've only seen some pictures so far. It looks
very much like a CO or a CK chondrite. I don't believe it is a
Kakangari-like meteorite (see David Weir's previous post to the List)
but if it was one, that would be a blast, of course! If it is a KAK,
it should have some of these characteristics:
- its oxidation state resembles that of enstatite chondrites - there
is a high abundance of pyroxene (more than olivine) - its oxygen
isotopes are comparable to those of CH or CR chondrites - a high
metal content similar to that of H chondrites.
If Jeff Kuyken's observation (see his website) about Moss chondrule
size is correct, 0.25-0.30 mm, this would favor a CO classification.
CK chondrites tend to have a chondrule size of 0.8 mm. KAK meteorites
have a chondrule size of 0.69 mm (according to Hutchison). Jeff's
estimate of the volume of chondrules (about 50%) would also favor a
CO classification (40 vol %) instead of 15 vol % for CK's or 19% for
KAK. Whatever it is, it is a beautiful, pristine new fall ...
Cheers,
Bernd
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