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

From: Pete Pete <rsvp321_at_meteoritecentral.com>
Date: Wed Oct 25 13:34:20 2006
Message-ID: <BAY104-F39AC9B39A868BFFC513D02F8060_at_phx.gbl>

Thanks, Darren,
Much clearer to me, now.
And now I can get some sleep ;)

The link you provided http://www.cnn.com/2006/TECH/space/10/25/sun.sisters/
is almost a complete answer to my post.
*Note that my post was about a half hour before the news break.
The odds of such a directly related news topic being released at such timing
must be....astronomical!

>>I think that they are concentrated by
whatever mechanism it is that melts the chondrules-- like oil separating
from
water, the iron/nickel separated from the silicates (and that is more
apparent
in armored chondrules).

If they were separated and the flecks were formed then, (I see that silica,
iron and nickel all melt at close to the same temp: ~1500 C) what mechanism
could have brought them back together into a relatively consistent mixture
of chondrule/metal flecks?
Maybe simply time, gravity, and the start of the rotation of the new solar
system swirling the soup?
That would be the most obvious, eh?
I would appreciate a reference, if anyone has one.

Cheers,
Pete



From: Darren Garrison <cynapse_at_charter.net>
Reply-To: cynapse_at_charter.net
To: "Pete Pete" <rsvp321_at_hotmail.com>
CC: meteorite-list_at_meteoritecentral.com
Subject: Re: RE: Re : [meteorite-list] Chondrule formation mechanism (Info
Please)
Date: Wed, 25 Oct 2006 12:55:53 -0400

On Wed, 25 Oct 2006 11:52:23 -0400, you wrote:

>If the heavy elements, such as nickel and iron, are created by a
supernova,
>and the chondrules are in theory formed much later during the future
>dynamics of our solar system's nebula, would it be fair to say that the
>metal flecks would be billions and billions (apologies, Carl) of years
OLDER
>than chondrules?

Of course the individual atoms in chondrules are much older than the
chondrules
themselves (but know knows exactly how many stellar generations ago) but as
for
the actual flecks of metal themselves, I think that they are concentrated by
whatever mechanism it is that melts the chondrules-- like oil seperating
from
water, the iron/nickel seperated from the silicates (and that is more
apparent
in armored chondrules).

Recently there has been news of studies on the decay products of short-lived
supernova produced elements that show that there were supernovas very close
(both in space and time) to the proto-solar system. (This article was
posted 22
minutes ago as I'm finding it)
http://www.cnn.com/2006/TECH/space/10/25/sun.sisters/

I believe (though I haven't googled up the articles related to it) that
recent
studies of elements and isotopes in certain meteorites suggest that
components
from at least 3 seperate supernovas contributed to the materials in the
early
solar system.

>If so, why don't we see any remnants of any supernova explosion in our
>relative proximity? The Helix Nebula is the closest to us, at 450
>light-years!

In our current position, it takes around 225 million years for one orbit of
the
center of the galaxy, or about 20 orbits since the birh of the sun. That's
plenty of time and distance for a whole lot more than 450 light-years of
drift
between the sun and the nursery.

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Received on Wed 25 Oct 2006 01:33:56 PM PDT