[meteorite-list] ALHA77254 (L5) and slickensides

From: Bernd Pauli HD <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 09:49:03 2004
Message-ID: <3BB0E687.7D253654_at_lehrer1.rz.uni-karlsruhe.de>

Hello Slickensiders,

I just stumbled over this detail:

The surfaces free of fusion crust have a dull orangish brown
weathering patina, with the exception of the B surface, which
is shiny or orangish brown. From field photographs it was
determined that this angular specimen had its B s u r f a c e
i n c o n t a c t w i t h t h e i c e at the time of
recovery. The B surface has slickensides.

Charlie asked:

> is this slickenside formed during a tectonic event on the
> parent body, an impact event in space, explosive breakup
> in earth's atmosphere, or o t h e r ?

The authors don't make it quite clear but their words seem to imply that
ALHA77254's slickensides are the result of its friction with the ice
while being transported to the location where it was finally picked up.

Reference:

Marvin, U.B. and Mason B. (1980) Catalog of Antarctic
Meteorites, 1977-1978, Smithson. Contr. Earth Sci. 23, p. 32


Best wishes,

Bernd
Received on Tue 25 Sep 2001 04:18:15 PM PDT