[meteorite-list] Dunite

From: (wrong string) ørn Sørheim <bsoerhei_at_meteoritecentral.com>
Date: Wed May 5 16:51:57 2004
Message-ID: <200405052045.i45KjIbb016775_at_mail41.fg.online.no>

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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Received on Wed 05 May 2004 04:45:20 PM PDT