Hi Jim,
Here is a good read about a volcanic maar crater in New Mexico that
deposited peridotite/olivine bearing lava 'bombs' with crustal/mantle
xenoliths. It is a great site to visit, went there in 2007 with a group of
friends and collected many specimens.
http://geoinfo.nmt.edu/tour/landmarks/kilbourne_hole/home.html
Best Regards,
Greg
====================
Greg Hupé
The Hupé Collection
gmh...@centurylink.net
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www.LunarRock.com (Online Planetary Meteorite Site)
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====================
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-----Original Message-----
From: Jim Wooddell
Sent: Wednesday, January 15, 2014 10:16 AM
To: meteorite-list@meteoritecentral.com
Subject: Re: [meteorite-list] Near pure Olivine Meteorite
Thank you all for your comments!
I am not sure either that ablation would be a huge factor in why we are
not finding olivine meteorites. The mean melting is about 3100 degrees
F (Fo = ~3450F, Fs =~2752), I think. I suppose, if I look at the
earth's mantle, olivine is a primary mineral but even then, I do not
find large chunks just laying around waiting to be found. My thinking
is that if it is such a primary mineral, we should see more, not knowing
the factors that completely effect it.
Jim
On 1/14/2014 10:25 PM, Alan Rubin wrote:
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
> ______________________________________________ -----
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--
Jim Wooddell
jim.woodd...@suddenlink.net
http://pages.suddenlink.net/chondrule/
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