[meteorite-list] Near pure Olivine Meteorite

From: Alan Rubin <aerubin_at_meteoritecentral.com>
Date: Tue, 14 Jan 2014 21:25:04 -0800
Message-ID: <705DDDA79B1E444C8BEF962866852A8E_at_igpp.ucla.edu>

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: aerubin at ucla.edu
website: http://cosmochemists.igpp.ucla.edu/Rubin.html


----- Original Message -----
From: <pshugar at messengersfromthecosmos.com>
To: "Alan Rubin" <aerubin at ucla.edu>; "Jim Wooddell"
<jim.wooddell at suddenlink.net>; <meteorite-list at 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" <aerubin at ucla.edu>
> Date: Tue, January 14, 2014 6:54 pm
> To: "Jim Wooddell" <jim.wooddell at suddenlink.net>,
> <meteorite-list at 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: 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 Wed 15 Jan 2014 12:25:04 AM PST