[meteorite-list] Bull's-eye chondrule assumptions

From: Darren Garrison <cynapse_at_meteoritecentral.com>
Date: Mon Mar 21 13:24:57 2005
Message-ID: <u4ch31difv9k0kk4ml4niob6507p5buubq_at_4ax.com>

On 16 Mar 2005 21:48:50 UT, bernd.pauli_at_paulinet.de wrote:

>The process that gave birth to such chondrules may have been either
>accretionary or condensational and the environment may have been
>dusty (which would point to early solar system processes).

Especially interesting is the chondrule on the left side of this image:

http://www.austromet.com/collection/NWA_1806_23.3g_A.jpg

It has a "bite" taken out of it (possibly a micro impact crater-- I call those "Pac-man chondrules")
and then the "skin" has formed on top of that, conforming to the shape of the "bite"-- so obviously
the "skin" formed after the bite, and thus after the chondrule formed.

I have a similar coated Pac-man chondrule in a piece of 869. You can't tell it too well in this
photo, but, like the piece above, there is a bite/microcrater in the chondrule and there is a thin
white rind or skin conformed around the shape of the chondule which had to form after the "bite".

http://webpages.charter.net/garrison6328/pacman.jpg
Received on Wed 16 Mar 2005 05:27:25 PM PST