[meteorite-list] Near pure Olivine Meteorite

[Alan Rubin]

The question of the dearth of olivine meteorites (asteroidal dunites) has 
been around for a very long time.  Most folks have ascribed this paucity as 
being due to the brittle nature of olivine meteorites relative to 
pallasites.  Pallasites have relatively long cosmic-ray-exposure ages 
indicating that they can survive the rigors of interplanetary space for a 
rather long while.  Eucrites have much shorter CRE ages on average.  This 
suggests that if asteroidal dunites are from deep in the mantle, they would 
be in space about as long as the pallasites and not survive because they are 
no tougher than eucrites.
Alan


Alan Rubin
Institute of Geophysics and Planetary Physics
University of California
3845 Slichter Hall
603 Charles Young Dr. E
Los Angeles, CA  90095-1567
phone: 310-825-3202
e-mail: aerubin at ucla.edu
website: http://cosmochemists.igpp.ucla.edu/Rubin.html


----- Original Message ----- 
From: "Jim Wooddell" <jim.wooddell at suddenlink.net>
To: <meteorite-list at meteoritecentral.com>
Sent: Tuesday, January 14, 2014 4:05 PM
Subject: [meteorite-list] Near pure Olivine Meteorite


> So, we find pallasites, we find irons, we find chondrites.  And, with the 
> pallasites some are loaded with a lot of olivine.  So anyone have any 
> scientific ideas why we don't find near pure olivine meteorites?  Or do 
> we??
>
> For the sake of conversation...
>
> Jim
>
> -- 
> Jim Wooddell
> jim.wooddell at suddenlink.net
> http://pages.suddenlink.net/chondrule/
>
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