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

From: Michael Farmer <mike_at_meteoritecentral.com>
Date: Tue, 21 May 2013 12:26:01 -0500
Message-ID: <3DD5C5DD-ECF1-4CDB-9417-0C186732404E_at_meteoriteguy.com>

Jim, there are shock veins and slickensides. They are not the same thing. They are result of shock but not melting like the full melt veins are.
I have hundreds of pieces with slickensides. I am traveling so I can't show photos.
Perhaps later.
Michael Farmer

Sent from my iPhone

On May 21, 2013, at 12:19 PM, Jim Wooddell <jim.wooddell at suddenlink.net> wrote:

> Hi Jim Baxter,
> And, that is what I am not seeing. I'am going to be a very hard sell on the term slickensides until I see something that scientifically supports it and why it is there. Do the threads actually appear and are they threads??
> In my mind, the coming apart part would not create a slickenside (cool state) where as the coming together with great pressure and time would. Just thinking out loud, not qualified to say one way or the other!
> I also see where this appearance is shown lower in topography in it's area which, to me, would be odd for slickenside.
>
> Cheers!
>
> Jim Wooddell
>
>
>
>
> On 5/21/2013 9:18 AM, Jim Baxter wrote:
>> Slickensides are polished surfaces caused by lateral movement along a fault plane. In hand specimens they feel rough when you rub your finger in one direction and smooth when you rub it in the other. Not sure that test would be feasible on the size specimens most of us own. In theory if the fault planes represent planes of weakness along which breaks occur then you could be seeing both things - slickensides that formed by lateral movement along the shock plane when the stone fractured.
>>
>> Jim Baxter
>
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Received on Tue 21 May 2013 01:26:01 PM PDT