[meteorite-list] FWD: Re: differentiated asteroids and stony-iron meteorite

[Art Jones]

---------- Forwarded message ----------
From: ALAN RUBIN <aerubin at ucla.edu>
To: Francesco Moser <cojack at tiscali.it>
Cc: Meteoritecentral List <Meteorite-list at meteoritecentral.com>
Date: Sun, 28 Jun 2015 13:25:56 -0700
Subject: Re: [meteorite-list] differentiated asteroids and stony-iron meteorite

The principal paradigm is that the pallasites are from the core-mantle boundary of a differentiated asteroid and that magmatic irons (those group[s whose elemental ratios are consistent with formation by fractional crystallization) are from the core.  There are non-magmatic irons (the IAB complex and the IIE irons) with more-controversial origins.  I think that they are impact products from the surface of chondritic asteroids.  The origin of mesosiderites is also controversial, but it seems to me that they are probably impact products formed when the core )or core plus mantle) of one differentiated asteroid fragment collided with the basaltic crust of another.

Alan Rubin