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

From: Jörn Koblitz <koblitz_at_meteoritecentral.com>
Date: Thu Sep 16 06:15:35 2004
Message-ID: <E5E6112EA31FA24CB448E091C6883C050EBCD7_at_server2000.microfab.de>

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,

J?rn


> -----Urspr?ngliche 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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>
Received on Thu 16 Sep 2004 06:15:19 AM PDT