This is what I was referring to in my previous email regarding one of my
Chelyabinsk specimens showing 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
very evident. Am I thinking correctly on this Mike, Sean, or whomever
wishes to respond?
http://s1300.photobucket.com/user/N68830/media/Chelyabinsk_fragment_zps1a7dfce6.jpg.html
Mal
On 5/21/2013 11:48 AM, Bob King wrote:
Hi Sean,
That photo shows it exactly!
Thanks,
Bob
On Tue, May 21, 2013 at 10:24 AM, Sean T. Murray <[email protected]> wrote:
I've noticed the same thing... I think this is a laterally exposed shock
vein... sometimes they are crusted over, other times they are pretty fresh,
so you can see the size of the exposed plane...
http://www.fallingrocks.com/Collections/Chelyabinsk.htm (4th picture down,
top left of photo...)
It's hard to take a picture of because it is so reflective, but it it quite
a beautiful feature of this fall.
Sean.
-----Original Message----- From: Sergey Vasiliev
Sent: Tuesday, May 21, 2013 11:16 AM
To: Michael Mulgrew
Cc: meteorite list
Subject: Re: [meteorite-list] Chelyabinsk - slickensides or shock planes?
Hi All,
Look at the two pictures of the same stone.
This is a fresh broken side with black shock veins on a very light matrix:
- http://sv-meteorites.com/gallery/chelybinsk/02.jpg
And this side is secondary crust over the shock vein:
- http://sv-meteorites.com/gallery/chelybinsk/01.jpg
You can find a lot of interesting things in Chelyabinsk ;-)
All the best,
Sergey
On Tue, May 21, 2013 at 4:59 PM, Michael Mulgrew <[email protected]>
wrote:
Bob,
My piece is just over 5g, but it was broken off a slightly larger
piece, probably less than 50g before it broke.
Michael in so. Cal.
On Tue, May 21, 2013 at 7:48 AM, Bob King <[email protected]> wrote:
Michael and all,
I forgot to add that even small 2-3g Chelyabinsks show this same
slick, grey material coating their broken faces. Can slickensides form
on rocks this small?
Bob
On Tue, May 21, 2013 at 9:43 AM, Michael Mulgrew <[email protected]>
wrote:
Bob, Jim, List,
I have a small piece that displays the slickenside in 3 distinct
locations; it's definitely not secondary fusion crust. Looking
forward to hearing more on the subject.
Michael in so. Cal.
On Tue, May 21, 2013 at 7:29 AM, Jim Wooddell <[email protected]>
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 <[email protected]> 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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