[meteorite-list] St-I Parent Bodies

From: Bernd Pauli HD <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 09:43:33 2004
Message-ID: <3B59E7EB.9DFF216F_at_lehrer1.rz.uni-karlsruhe.de>

AL wrote:

> I haven't read anything recent on stony-iron pairings and possible new
> parent bodies but based on what I have read in the past there are two
> distinct pairings for the stony-iron classes.

BOESENBERG J.S. et al. (1995) Pyroxene Pallasites - A New Pallasite
Grouplet (Meteoritics 30-5, 1995, 488, excerpt from the conclusion
chapter):

The presence of three pallasite groups or grouplets may be indicative of
three parent bodies, with only the MG* pallasites related to the HED
group.

* main group pallasites

> I think only one for the mesosiderites, though it has been suggested
> that asteroid Vesta could also be a source of the mesosiderites.

TERRIBILINI D. et al. (2000) Mineralogical and chemical composition and
cosmic-ray exposure history of two mesosiderites and two iron meteorites
(MAPS 35-3, 2000, pp. 617-628, excerpt from the introduction):

One of the fundamental issues in mesosiderite history and petrogenesis
is the question of the relationship of their silicates with those of the
howardite, eucrite, and diogenite (HED) parent body.
Mittlefehldt (1979) compared the lithic clasts of mesosiderites with
those of the HED meteorites and found that mesosiderites and howardites
have virtually indistinguishable major element compositions and
mineralogies. He concluded that the parent bodies represented by these
meteorite classes are very similar in bulk composition and that the
differences between mesosiderites and howardites could possibly be due
to their being samples of different portions of the same parent body.
However, in further studies of this issue, Mittlefehldt (1990) and Rubin
and Mittlefehldt (1993) came to the conclusion that a common parent body
is unlikely.


Best wishes,

Bernd
Received on Sat 21 Jul 2001 04:36:59 PM PDT