From: Michel <Michel_at_meteoritecentral.com>
Date: Thu Apr 22 09:49:02 2004
Hello Bernd and list
Is Zag also a meteorite with slickenside ?
----- Message d'origine -----
De : Bernd Pauli HD <bernd.pauli_at_lehrer1.rz.uni-karlsruhe.de>
À : Charlie <moonrock25_at_webtv.net>
Cc : <meteorite-list_at_meteoritecentral.com>
Envoyé : dimanche 23 septembre 2001 23:00
Objet : [meteorite-list] Slickenside
> Charlie wrote:
> > Can anyone clarify for me the origin of slickenside in meteorites? I
> > understand the term as it applies to terrestrial soils and sediments. I
> > have a large individual of Plainview(1917). It's a flat specimen, with
> > one side fully crusted. The other side looks more like a broken
> > surface, with crust lipping over the edge from the crusted side. This
> > "broken" surface is covered with glossy striations in large patches that
> > I'm assuming is slickenside. What I would like to know is if this
> > slickenside formed during a tectonic event on the parent body, an impact
> > event in space, explosive breakup in earth's atmosphere, or other?
> Hello Charlie and List,
> All I can contribute is a comment from our former, very
> competent list member Frank Stroik many years ago:
> "slickensides are identified by shiny mirror like surfaces on an
> otherwise rough rock - they are the product of faulting in a rock
> body; as the crust shifts, even slightly, the roughness of the rock
> tends to smooth."
> ... and some meteorites that are reported to exhibit slickensides:
> Magombedze (H6): In places where the meteorite has been broken exactly
> along these veins, exposed metal grains are smeared and streaked and
> show obvious slickensides [MacPHERSON G.J. et al. (1993) Magombedze:
> A new H chondrite with light-dark structure (Meteoritics 28-1, 1993,
> ALHA77225 (H4): The B surface has what appear to be slickensides, but
> because of the severe weathering of the specimen it is impossible to
> determine this unambiguously [MARVIN U.B. and MASON B. (1982) Catalog
> of Meteorites from Victoria Land, Antarctica, 1978-1980 (Smithsonian
> Contributions 24, p. 23)].
> ALHA77254 (L5): The B surface has slickensides [Marvin, U.B. and
> Mason B. (1980) Catalog of Antarctic Meteorites, 1977-1978,
> Smithson. Contr. Earth Sci. 23, p.32].
> ALHA78108 (H5): Many slickensided surfaces were exposed during
> processing [MARVIN U.B. and MASON B. (1982) Catalog of Meteorites
> from Victoria Land, Antarctica, 1978-1980 (Smithson. Contr. 24, p. 28)].
> LON 94102 (C2): Slickenside-like features are visible on
> the surface (Macroscopic Description: Kathleen McBride)
> > Also, regarding Plainview(1917), can anyone tell me if the newest
> > edition of the Catalog makes reference to this meteorite being a
> > possible witnessed fall from 1903(?)?
> No, Charlie, it doesn't.
> Best wishes,
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Received on Mon 24 Sep 2001 04:01:52 AM PDT