[meteorite-list] reduced ordinary chondrites revisited

From: David Weir <dgweir_at_meteoritecentral.com>
Date: Thu Apr 22 09:52:24 2004
Message-ID: <3D6D2627.589A10F_at_earthlink.net>

Hello List,

I found the following abstract from the latest MetSoc meeting
interesting. Having not read the GCA article by Wasson that was
mentioned by Jeff, I was interested to read some further details on the
subject, however brief. I assume this is what Wasson wrote about.

http://www.lpi.usra.edu/meetings/metsoc2002/pdf/5083.pdf

It seems to me to give more credence to Jeff's (and Wasson's ?)
statement ascribing the reduction of OCs to different parent body
processes, rather than to an origin on a separate parent body - the
latter proposal suggested in one post-Wasson, non-peer-reviewed paper.

David
________________________________

on Sat, 13 Jul 2002 20:09:33 -0400
Jeff Grossman wrote:

There are ordinary chondrites more reduced than the H group. Burnwell
is one. Others were studied by:

Wasson J. T., Rubin A. E., Kallemeyn G. W. (1993) Reduction during
metamorphism of four ordinary chondrites. Geochim. Cosmochim. Acta 57
(8), 1867-1878.

If memory serves, some of the meteorites discussed in this paper were
Suwahib (Buwah), Willaroy, and Cerro los Calvos.

There don't really form an "extension" of H chondrites. They are
anomalous, and have seen different processes.

jeff
Received on Wed 28 Aug 2002 03:36:07 PM PDT