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

From: Rob McCafferty <rob_mccafferty_at_meteoritecentral.com>
Date: Sat Oct 21 20:33:47 2006
Message-ID: <20061022003345.91309.qmail_at_web50909.mail.yahoo.com>

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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Received on Sat 21 Oct 2006 08:33:45 PM PDT