[meteorite-list] Chondrule formation mechanism (Info Please)

From: E.P. Grondine <epgrondine_at_meteoritecentral.com>
Date: Sat Oct 21 22:12:36 2006
Message-ID: <20061022021233.98774.qmail_at_web36909.mail.mud.yahoo.com>

jeez Bob,

and all I was trying to do was to come up with a good
excuse to personally examine that Krasnojarsk RSPOD
Oct 15.

You're just about ready to handle some of my asteroid
and comet impact correspondence.

Ed

--- Rob McCafferty <rob_mccafferty_at_yahoo.com> wrote:

> Hi list
>
> What I have ben able to find personally on chondrule
> formation is rather sketchy.
>
> Even the otherwise comprehensive Encyclopedia of
> Meteorites by O. Richard Norton seems to skim over
> the
> mechanism in a paragraph. It's almost as if there is
> something which defies explanation and scientists
> abhor that more than nature abhors a vacuum.
>
> The "slow cooling followed by a rapid quenching"
> period is that which interests me most.
>
> I would dearly like to know where to find the most
> up-to-date theories on chondrul formation. I know
> about the R-R Lyrae heating, timescales and
> frequecies
> for newly forming stars. I need theory of
> protostellar
> nebula. Maybe Nebula density/stellar distance
> formula.
> The conditions in which and the timescale in which
> these 0.1- 3mm chondules formed.
>
> Contact off list if you wish. I need this
> information
> to assist me with a theory I have, the information
> for
> which comes from branches of science so diverse,
> that
> their relevance has not been realised. It is only by
> serendipity that I make the connection.
> My thoughts will appear here first (though I will
> ruthlessly hunt down and murder anyone who tries to
> plagarise my theory, hehe)
>
> Rob McCafferty
>
>
> --- Darren Garrison <cynapse_at_charter.net> wrote:
>
> > On Sat, 21 Oct 2006 16:41:48 -0700 (PDT), you
> wrote:
> >
> > >> Chondrule textures depend on the extent of
> > melting
> > >> of the chondrule precursor- material when
> cooling
> >
> > >> starts.
> > >
> > >Kind of begs the question - chodrules formed by
> > >collision, which causes melt - consider if one
> > started
> > >from a steady molten state
> > >
> > >>If "viable nuclei"
> > >
> > >I wonder what these "viable nuclei" are? viable
> > cystal
> > >nuclei=Chondrules?
> >
> > How things appear to be (without trying to refer
> to
> > chemical/minerological
> > details that are beyond my level of knowledge) is
> > that what became chondrules
> > started out as "fluff" that slowly accumulated
> from
> > the solar nebula, like you
> > mentioned earlier. I imagine something like
> > snowflakes, or dust-bunnies.
> > Something fragile and irregular filled with empty
> > spaces. Then, something (and
> > there is no consensus on what that "something"
> was)
> > heated those
> > dust-bunnies/snowflakes up to the point where they
> > melted-- and in a
> > microgravity environment surface tension pulled
> them
> > into little spheres. The
> > "viable nuclei" means parts of that original fluff
> > that didn't fully melt and
> > became seeds for the new minerals to grow on.
> > ______________________________________________
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> >
>
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> >
>
>
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Received on Sat 21 Oct 2006 10:12:33 PM PDT