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

From: Michael Mulgrew <mikestang_at_meteoritecentral.com>
Date: Tue, 21 May 2013 07:59:18 -0700
Message-ID: <CAMseTy0dqBiGx_w4BFiBen0OTUi056bCi8GH5rqDkc9+ZVd5Uw_at_mail.gmail.com>

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
>>> > ______________________________________________
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>>>
>>>
>>> --
>>> Jim Wooddell
>>> jimwooddell at gmail.com
>>> 928-247-2675
>>> ______________________________________________
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Received on Tue 21 May 2013 10:59:18 AM PDT