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: aeru...@ucla.edu
website: http://cosmochemists.igpp.ucla.edu/Rubin.html
----- Original Message -----
From: "Jim Wooddell" <jim.woodd...@suddenlink.net>
To: <meteorite-list@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.woodd...@suddenlink.net
http://pages.suddenlink.net/chondrule/
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