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

From: Bob King <nightsky55_at_meteoritecentral.com>
Date: Tue, 21 May 2013 10:48:09 -0500
Message-ID: <CAG5KyV=H7EWvphdaAaMAeQdDKjS7GnMqfRwzQ8bMTW_ZQcAgXw_at_mail.gmail.com>

Hi Sean,
That photo shows it exactly!
Thanks,
Bob

On Tue, May 21, 2013 at 10:24 AM, Sean T. Murray <stm at bellsouth.net> 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 <mikestang at gmail.com>
> 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 <nightsky55 at gmail.com> 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 <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
>>>>> > ______________________________________________
>>>>> >
>>>>> > Visit the Archives at http://www.meteorite-list-archives.com
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>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Jim Wooddell
>>>>> jimwooddell at gmail.com
>>>>> 928-247-2675
>>>>> ______________________________________________
>>>>>
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>>
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>>
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Received on Tue 21 May 2013 11:48:09 AM PDT