Iron meteorites tend to break up in the atmosphere at lower depths than
stony meteorites, so I suppose that pallasites would also be better able to
survive transit through the Earth's atmosphere than dunites. But I am
guessing that very few dunites ever make it to the top of the Earth's
atmosphere to begin with.
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: <pshu...@messengersfromthecosmos.com>
To: "Alan Rubin" <aeru...@ucla.edu>; "Jim Wooddell"
<jim.woodd...@suddenlink.net>; <meteorite-list@meteoritecentral.com>
Sent: Tuesday, January 14, 2014 5:27 PM
Subject: RE: [meteorite-list] Near pure Olivine Meteorite
Would they also melt or more correctly ablate off material faster and
more completely
upon entering the earth's atmosphere?
Pete
-------- Original Message --------
Subject: Re: [meteorite-list] Near pure Olivine Meteorite
From: "Alan Rubin" <aeru...@ucla.edu>
Date: Tue, January 14, 2014 6:54 pm
To: "Jim Wooddell" <jim.woodd...@suddenlink.net>,
<meteorite-list@meteoritecentral.com>
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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