[meteorite-list] CAIs in Allende

From: entropydave <entropydave_at_meteoritecentral.com>
Date: Thu Apr 22 09:44:14 2004
Message-ID: <000f01c0fce2$8fa46ce0$4da989d4_at_default>

Hello everyone,
Loving the threads.... tempers a bit high at the moment though, aren't they?
I'm on the side of the good guys.... I'm that shallow!!!

I notice that in my Allende slice, some of the CAIs appear to be zoned, that
is they have a roughly central area of a greyer material than the rest of
the CAI that surrounds it. Can any of you erudite people afford me an
explanation as to how the gray inner region varies chemically/lithologically
to the outer portion.
I am assuming that there was some sort of differentiation going on here
whilst the CAIs were forming,and bearing in mind that I do not know whether
the CAIs are extrasolar material or refractory particles that formed close
to the Sun during the protoplanetary disk phase (ie c. orbit of Mercury) I
would like to know a model for this phenomenon.

Anyway, no misspelling of Vigarano this time at least....

very best regards -

BTW - If Dr Monica Grady lurks this list - I'd love to have a 'personal'
cruise around the NHM collection at a suitably slack time for you! I got a
lot to learn! Please respond offlist to me! Thanks in anticipation!

--
In gentle decay,
d.
http://www.meteorites.ic24.net/index.html
http://www.thc.u-net.com/davethc1.htm
"I have a proof that x^n+y^n=z^n never has integer solutions for n>2.
However, it won't fit into my signature file...."

Received on Sun 24 Jun 2001 03:19:14 PM PDT