[meteorite-list] Near pure Olivine Meteorite

From: Alan Rubin <aerubin_at_meteoritecentral.com>
Date: Tue, 14 Jan 2014 16:54:00 -0800
Message-ID: <396C5382BD634563B121BF6918AA0AE5_at_igpp.ucla.edu>

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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Received on Tue 14 Jan 2014 07:54:00 PM PST