[meteorite-list] Park Forest Chondrules

From: rochette <rochette_at_meteoritecentral.com>
Date: Thu Apr 22 10:25:45 2004
Message-ID: <v04003a00baf768c30472_at_[193.49.98.39]>

Dear Bernd and Steve

Most chondrites have suffered large deformation (one could also call it
compaction), responsible for the the flatenning of chondrules. This may not
be always as visible as in your PF samples (depends on amount of
deformation and orientation of the cut surface), but may be if you look
again at all your samples in collection, I bet you will find other oval
chondrules now that you become interested by the subject! A good reference
(on Leoville): P.M. Cain and H.Y. McSween (1984) L.Planet. Conf abstract
p.116.

>Bernd,

>
>I just spent a while at the microscope, (first time since March 26,
>shame on me), and I'm seeing exactly what you're talking about. The
>vast majority, (app 90%+) in my slices anyway, have the same
>orientation. Another thing I'm seeing that's really neat is that the
>bars in the barred olivine chondrules seem not to be running in a
>straight line as I'm used to seeing, but rather have a swirl, again
>following the shock orientation! Gotta get more time at the 'scope.
>Hope to post a link to some images later.
>
>thanx,
>Steve
>
>
>--- bernd.pauli_at_paulinet.de wrote:
>> Hello Listees,
>>
>> Although the entry in Met.Bull. 87, 2003 says that there are no
>> visible chondrules in hand sample, one of my specimens from
>> Steve Witt does have a few easily discernible chondrules. Now,
>> assuming they are really chondrules, the astonishing thing about
>> them is that they are all slightly oval and seem to show a
>> preferred
>> orientation (as if they were "going with the flow" of the dark
>> parts
>> of the matrix material). Any comments?
>>
>> Best wishes,
>>
>> Bernd
>>
>>
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>
>
>
>=====
>Steve Witt
>IMCA #9020
>
>http://www.meteoritecollectors.org
>
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Pierre
Received on Mon 26 May 2003 02:55:36 AM PDT