Hi Bob, Jim, and list -
One of my Chelyabinsk specimens shows a feature where it appears
to be fractured along a weakened shock vein/point where melt had
filled the vein before the actual splitting apart. The melt is still
very evident covering a large portion of the fresh exposed matrix after
the specimen split in two.
In short, I tend to agree with Blaine.
Regards,
Mal
On 5/21/2013 10:29 AM, Jim Wooddell wrote:
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 <nightsk...@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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