[meteorite-list] Slickenside (& mullions)

From: Robert Verish <bolidechaser_at_meteoritecentral.com>
Date: Thu Apr 22 09:49:03 2004
Message-ID: <20010925183832.1755.qmail_at_web10407.mail.yahoo.com>

Good point, Bernd:

And there is another feature of slickenside not found
in shatter cones... it's called "mullion". These are
defined as "grooves or slip line structures -
corrugations in the fault surface". Real fault
surfaces are not perfectly planar.

There are very fine partings in these mullions that
are produced by "plucking" as the two planar sides
grind past each other. This is what you feel on a
slickenside surface going in one direction, but not in
the opposite direction, as described by James Baxter
in his earlier post.

I see this feature very often in the meteorites with
slickenside, but I haven't been lucky enough to find a
shatter cone in a meteorite, yet.

Bob V.

--- Bernd Pauli HD
<bernd.pauli_at_lehrer1.rz.uni-karlsruhe.de> wrote:
> Hello Again,
>
> In the early days of impact cratering research,
> those conical
> fragments of rock that we call shatter cones were
> merely thought
> to be slickensides - BUT: the striations in
> slickensides are always
> parallel, whereas in shatter cones they emanate in
> radiating bundles
> from the tip of the cone. So, if you think your
> meteorite specimen
> has got a slickenside surface, the striations should
> occur in parallel
> sets.
>
>
> Best wishes,
>
> Bernd



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Received on Tue 25 Sep 2001 02:38:32 PM PDT