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

From: Bob King <nightsky55_at_meteoritecentral.com>
Date: Tue, 21 May 2013 09:48:13 -0500
Message-ID: <CAG5KyVkxcgBcNJkWqq3tDYqurrQ0YoWnWq5+Pgvc1d=ai4oGag_at_mail.gmail.com>

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 <mikestang at gmail.com> 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 <jimwooddell at gmail.com> 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 <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
>> ______________________________________________
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Received on Tue 21 May 2013 10:48:13 AM PDT