[meteorite-list] Re: The Pribram/Neuschwanstein Meteoroid Stream Is Not Dead

From: E.P. Grondine <epgrondine_at_meteoritecentral.com>
Date: Thu Apr 22 10:08:30 2004
Message-ID: <20020924185453.253.qmail_at_web11606.mail.yahoo.com>

I suppose that ultimately this may all go back to
whether or not Jupiter occupied its current orbit
before the LPBE (Late Period Bombarment Event) - my
guess is that it did not.

ep


--- Herbert Raab <herbert.raab_at_utanet.at> wrote:
>
> Mark Fox writes:
> > In theory then, a collision-formed stream of
> Pribrams
> > with an occasional Neuschwanstein in it "is"
> possible.
> > It would be splendid to know if any brecciation
> > (including clasts) exist in Neuschwanstein or
> > Pribram, as that may give credence to the asteroid
> > impact possibility.
>
> The classification of Neuschwanstein as E6 is
> certainly
> puzzling. But the very different class of two
> meteorites
> (Pribram H5, Neuschwanstein E6) coming from the same
>
> orbit might indicate a "rubble pile" asteroid as the
>
> source. Observations with radar and spacecraft have
> indicated rubble pile asteroids before. It's
> probably
> safe to say that such rubble piles are made up of
> rocks
> coming from different sources (planetesimals).
>
> So, maybe Pribram and Neuschwanstein were formed
> on/in
> different planetesimals in the early solar system,
> and
> were only later mixed ito one rubble pile asteroid.
> Finally, they were ejected from that asteroid into
> an Earth-crossing orbit.
>
> Note that there is the possibility of soft
> collisions
> among small bodies, so a rubble pile of H and E
> material
> is still a possibility, even if there are not
> heavily
> brecciated and if there are no E-clasts in Pribram
> or
> H-clasts in Neuschwanstein.
>
> I admit that, even in a rubble pile asteroid, we
> probably
> would expect on class of material to dominate over
> others.
> The chances that we get two completely fifferent
> meteorites
> from the same rubble pile asteroid are probably
> small, but
> maybe it's only a first hint on how complex the
> history of
> the asteroid belt and the meteorite parent bodies
> really
> is...?
>
> Hopefully, further research (e.g., CRE ages,
> O-isotopes)
> will shed more light on the relation between Pribram
> and
> Neuschwanstein...
>
> Best greetings,
> Herbert Raab
>
>
>
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Received on Tue 24 Sep 2002 02:54:53 PM PDT