[meteorite-list] metal-rich diogenite vs mesosiderite-C

[Jörn Koblitz]

Dear All,

It seems, there is a problem with the class C mesosiderites and the metal-rich diogenites, which may just be fragments of the same meteorite shower.

In the last Met. Bulletin 88, the following classifications and remarks are given:

NWA 1982: an ungrouped achondrite "not paired with NWA 1827 or NWA 1879 mesosiderite"

NWA 1827: mesosiderite (tentatively classified C) "resembles a metal-rich diogenite... [but is] part of a large, heterogeneous mesosiderite containing sparse eucritic and diogenitic clasts"

In the abstract by T. E. Bunch et al. (2003) MAPS 39, no. 8 (Suppl.), p.A19, which is the same MAPS issue with the Bulletin 88, the authors conclude that NWA 1827 and NWA 1982 are paired and that they "could be misidentified as "metal-rich diogenite."

So, at least for NWA 1982, we have a clear ambiguity between these two references.

Best regards,

Jörn


> -----Ursprüngliche Nachricht-----
> Von: David Weir [mailto:dgweir at earthlink.net]
> Gesendet: Mittwoch, 15. September 2004 20:03
> An: j.divelbiss at att.net
> Cc: meteorite-list at meteoritecentral.com
> Betreff: Re: [meteorite-list] metal-rich diogenite vs mesosiderite-C
> 
> 
> John,
> 
> According to the scientists at NAU (Wittke, Bunch), this is a 
> metal-rich
> diogenite and not a meso. Check out their nice website:
> 
> http://jan.ucc.nau.edu/~wittke/Microprobe/Probe.html
> 
> Click on "NAU Meteorite Classifications" and then on the diogenite
> section and scroll to the bottom to read the official 
> classification. My
> website also has some information on this unique diogenite.
> 
> David
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