[meteorite-list] Near pure Olivine Meteorite

From: Jim Wooddell <jim.wooddell_at_meteoritecentral.com>
Date: Wed, 15 Jan 2014 08:16:53 -0700
Message-ID: <52D6A665.4040104_at_suddenlink.net>

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: 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
>>
>> > ______________________________________________ -----
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>

-- 
Jim Wooddell
jim.wooddell at suddenlink.net
http://pages.suddenlink.net/chondrule/

Received on Wed 15 Jan 2014 10:16:53 AM PST