[meteorite-list] Chelyabinsk - slickensides or shock planes?

From: Jim Wooddell <jimwooddell_at_meteoritecentral.com>
Date: Tue, 21 May 2013 07:29:31 -0700
Message-ID: <CAH_zgwEUQP-KO3B3_h_u7qPosU8Zw43CCdc1tJaTJnCOA07zXw_at_mail.gmail.com>

Hi Bob and all!
I might be wrong in assuming, but your slickensides sounds like you
are attempting to describe secondary fusion???

We have lots of evidence in various meteorites where they broke apart
for whatever reason at the weak boundaries. For example, Franconia
area meteorites (some) break apart from both sides of a metal vein
leaving three pieces...two chondrite fragments and an H-Metal
"cornflake".
It's sort of like looking at a bad weld through xray.
How can you tell? Look at more and look closer. A 3D CT sort of scan
that has become popular with Sutter's Mill or Dr. Agee's research on
"Black Beauty" may reveal what you speak of. Just my thoughts.

Kind Regards,

Jim


On Tue, May 21, 2013 at 7:06 AM, Bob King <nightsky55 at gmail.com> wrote:
> Hi everyone,
> Many pieces of broken Chelyabinsk specimens display what appears like
> fusion crust over slickensides, but is that what it really is? I've
> talked with Blaine Reed and he thinks we're seeing blackish shock
> veins (planes really) where the meteorite split along a line of
> weakness. He even mentioned a piece he's seen where a large shock vein
> in the matrix leads directly to the broken, dark face. Assuming
> Chelyabinsk shows both slickensides and shock vein planes, how do you
> tell them apart?
> Thanks for your thoughts.
> Bob
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-- 
Jim Wooddell
jimwooddell at gmail.com
928-247-2675

Received on Tue 21 May 2013 10:29:31 AM PDT