[meteorite-list] Dunite

From: Dave Mouat <dmouat_at_meteoritecentral.com>
Date: Wed May 5 19:29:58 2004
Message-ID: <409978D1.BE5FB3A7_at_dri.edu>

Dear Listees
As one who has done a bit of geobotanical and remote sensing research in the
Josephine Ophiolite in SW Oregon, I can suggest that in the ultramafic rck of
SW Oregon and NW California, one will find mostly serpentinized peridotites
and occasionally non-serpentinized dunites. Washington State also has a
couple of outcrops as well.
Dave

"Bj?rn S?rheim" wrote:

> Hello List,
> Since on the topic of dunite or olivine.
> Just a km from where I live there are at least two locations
> of large dunite outcrops.
> Less than 100 km to the south of me there are three valleys
> almost composed of just dunites. One is made into a large scale
> open pit mine. Farms has been swallowed by this open pit mine.
> In the other valley a large underground mine is being started up as
> I write this.
> How usual are such large outcrops of dunite/olivine around the world,
> like in the US - rockies?
> Micro-diamonds has been found in the area here, and toghether
> with dunite they both tell the story of bedrock that was once
> far deeper into the crust, maybe ~50 km deep. Which nowadays
> is at the surface, thanks to tectonic movements.
> If anyone is looking for pure dunite, it's not hard for me
> to find nice specimens around here.
>
> Bj?rn S?rheim,
> in Norway
>
> of deep
> At 14:16 05.05.04 -0600, you wrote:
> >Good afternoon List;
> >Dunite is one of the mineral groups that are mantle derived here on
> >Earth, and diamonds are associated with, didn't we discuss diamonds last
> >week in a different context.
> >Very small world.
> >Could there be a chance of diamonds in a dunite asteroid out there
> >floating around in space?
> >Space prospector,
> >Dave Freeman
> >
> >bernd.pauli_at_paulinet.de wrote:
> >
> >>>On a side note, how many meteorites incorporate dunite as part of their
> >>>makeup? The only place I remember hearing about dunite previously was
> >>>in Chassigny, since Chassigny is a Martian example of what would be
> >>>called a dunite on Earth.
> >>>
> >>
> >>Well, dunite, a coarse-grained igneous rock composed
> >>almost entirely of olivine, has been reported from:
> >>
> >>Chassigny (SNC)
> >>Dhofar 307 (LUN-A)
> >>Dhofar 730 (LUN-A)
> >>Mount Padbury (MES)
> >>Mincy (MES)
> >>[Putorana contains feldspathic dunite]
> >>
> >>Bernd
> >>
> >>
> >>
> >>
> >>
> >>To: daistiho_at_hotmail.com
> >> Meteorite-list_at_meteoritecentral.com
> >>
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> >>
> >
> >
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>
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Received on Wed 05 May 2004 07:29:21 PM PDT