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

[Jim Wooddell]

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