[meteorite-list] Impact Melt Meteorites/Rose City

From: Mark Fox <unclefireballmtf_at_meteoritecentral.com>
Date: Thu Apr 22 09:47:13 2004
Message-ID: <20011123223727.24930.qmail_at_web14911.mail.yahoo.com>

November 23, 2001

Greetings Meteorite Enthusiasts!

Speaking of impact melts, wouldn't Rose City, (an H5
chondrite) also be considered such a meteorite? That
particular space rock sure seems to have a dark
interior if the picture I remember seeing of one was
not completely fusion crusted. It fell about 9 miles
NE of Rose City, Michigan, on October 17, 1921.

Long strewn fields!

Mark Fox
Newaygo, MI USA


--- Bernd Pauli HD
<bernd.pauli_at_lehrer1.rz.uni-karlsruhe.de> wrote:
> Michel Franco a écrit:
>
> > ... was wondering if there are 2 main classes of
> impact
> > melt meteorites, as one could think Impact melt m.
> of
> > achondritic origin and impact melt m. of
> chondritic
> > parent body.
>
>
> Bonsoir Michel, hello List,
>
> Here is a database survey of 12 Non-Antarctic
> meteorites that
> are classified as impact melt meteorites. Some new
> ones may
> still be missing from this list as I am not "on
> track" with my
> update chores :-(
>
> Best wishes,
>
> Bernd
>
> Calcalong Creek - LUN - impact melt breccia;
> Cat Mountain - L5 - impact melt breccia; vesicles;
> Chico - L6 - impact melt breccia; copper; S6;
> Dar al Gani 241 - imb - impact melt breccia
> Dar al Gani 242 - imb - impact melt breccia
> Dhofar 025 - LUN - anorthositic impact melt regolith
> breccia;
> Happy Canyon - EL6 - EL6/7 (S2); impact melt
> breccia(?); vesicles;
> Madrid - L6 - veined; impact melt breccia
> Norton County - AUB - fragmental breccia;
> clastic matrix (igneous and impact melt)
> Roosevelt County 085 - L4 - RC,S4; W2; impact melt
> Sahara 00215 - L - W3/4; impact melt breccia;
> Shaw - L6 - Dodd: L7; complex impact melt breccia;
>
> US-Antarctica:
>
> ALHA81011 - eucritic impact melt breccia
>
> EET 99443: "The section exhibits isolated pyroxene
> and plagioclase
> grains up to 0.5 mm. The section contains one part
> in which the
> groundmass is finely comminuted pyroxene and
> plagioclase grains,
> while the groundmass in the other is a fine-grained,
> lath-like
> structure suggestive of an i m p a c t m e l t .
> The meteorite
> is a howardite (AMN 24-1, Feb 2001, p. 11).
>
> MET 00427: "The section shows ...a single
> millimeter-sized
> i m p a c t m e l t spherule. The meteorite is a
> howardite
> (AMN 24-2, September 2001, p. 19).
>
> QUE 99059 is almost certainly paired with the trio
> QUE 94204/
> 97348/97289, ... These meteorites are unusual
> aubrites or
> enstatite chondrite impact melt rocks (AMN 24-1, Feb
> 2001, p. 13).
>
> References:
>
> METZLER K. et al. (1994) ALHA81011 - A eucritic
> impact melt
> breccia formed 350 m.y. ago (abs. Meteoritics 29,
> 1994, 502-503).
>
> METZLER K. et al. (1995) Impact melt rocks and
> granulites
> from the HED asteroid (abs. Meteoritics 30, 1995,
> 547).
>
> Show your support at the Red Cross Disaster Relief
> Fund -
>
http://s1.amazon.com/exec/varzea/ts/my-pay-page/PKAXFNQH7EKCX/058-5084202-7156648
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Received on Fri 23 Nov 2001 05:37:27 PM PST