[meteorite-list] Impact Melt meteorites

From: tett <tett_at_meteoritecentral.com>
Date: Thu Apr 22 09:47:13 2004
Message-ID: <3BFED50A.BF0B24AD_at_bmts.com>

Bernd,

Your list should also included that most beautiful Canadian meteorites, Abee. Classified as an EH Impact melt breccia in the 2000 catalogue of
meteorites.

Cheers,

Mike Tettenborn

Bernd Pauli HD 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).
>
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Received on Fri 23 Nov 2001 06:00:26 PM PST