Hello List,
I believe Phil is correct with his idea that the veining is really
weathering artifacts and not actual shock veins. It's hard to tell without
seeing some pictures, so, below is a link to two pictures of Sacramento
Wash 003, a new Arizona meteorite I found in the Franconia area a couple
years back. You can see in the lower picture (close-up) that there is a
network of small spider web size veins that ASU confirmed as "weathering
artifacts" and not shock veins. Compare these to the specimens in question
and see if you notice any simplarities. My regular site,
meteoriteimpact.com, is down for a few days so I uploaded the pictures to
one of my personal sites.
http://www.jkgwilliam.com/SaW003.htm
Best,
John Gwilliam
At 08:10 PM 6/8/2006, Phil Morgan wrote:
Hi Bob,
Are they really shock veins or simply some sort of weathering deposit in
small cracks as they disintegrate into extra-terrestrial soil?
I don't have any idea how this would work exactly or the substances
involved, but I've always thougth them to be a by-product of weathering
rather than shock.
Regards to all,
Phil
----- Original Message ----- From: <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, June 08, 2006 9:15 AM
Subject: RE: AW: [meteorite-list] Dhofar vs. NWA meteorites
Hi Martin,
Thanks for your observations on Dhofar vs. NWA. What you wrote makes sense.
However I still wonder why many of the Dhofar chondrites have so many fine
shock
veins compared to the NWAs. Any thoughts?
Bob
Original Message:
-----------------
From: Martin Altmann [EMAIL PROTECTED]
Date: Thu, 8 Jun 2006 14:36:29 +0200
To: [email protected], [EMAIL PROTECTED]
Subject: AW: [meteorite-list] Dhofar vs. NWA meteorites
Hi Bob,
So we have two reasons:
The more harsh weathering conditions in Oman
and a economical one, that from the NWA one sees only the tip of the
iceberg's weathering scale, cause the more rotten stuff doesn't sell.
Buckleboo!
Martin
-
Hi all,
I've seen a good number of Dhofar and NWA common chondrites and
I've noticed that there are many among the Dhofars which exhibit highly
weathered interiors laced with rich, thread-like shock veins. These
veins seem to be far less common in NWA chondrites and I wonder
why. Can anyone shed light on this little mystery (for me)? Thank you!
Bob
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