[meteorite-list] Rocks from Space Picture of the Day - February24, 2010

From: Darryl Pitt <darryl_at_meteoritecentral.com>
Date: Wed, 24 Feb 2010 13:20:15 -0500
Message-ID: <8C14063C-2706-4D88-B738-336A94AB410C_at_dof3.com>

Norbert is exactly correct. I regret I neglected to mention this in
the pic of the day description. The tiny vugs have been previously
described on a couple of occasions and to do so again seemed
superfluous. Apologies.

d,



On Feb 24, 2010, at 1:06 PM, Norbert Classen wrote:

> Hi Adam, Greg, and All,
>
> I'm no expert when it comes to iron meteorites, but could these
> "voids"
> represent troilite nodules or other phases which have been weathered
> out of
> the specimen by the same forces that created the ziggurat
> structures? Just
> think of the exterior parts of Mundrabilla and its "voids" and
> "vugs" which
> are also weathered out troilite nodules and no primary features...
>
> Just my two cents,
> Norbert
>
> -----Urspr?ngliche Nachricht-----
>
> HI Adam and List,
>
> This is a fascinating specimen. Surely it represents a previously-
> unknown
> parent body.
>
> While the presence of vugs/vesicles suggests the specimen was not
> formed in
> a vacuum, maybe there was some gases present during the formation.
>
> For example, suppose a large comet slammed into a predominately-iron
> asteroid. Comets contain large volumes of material that can
> sublimate, and
> maybe during the collision, some of this gaseous material injected
> into the
> iron body. The heat and/or shock resulting from the collision
> provided
> inroads for the cometary material by expanding existing fissures or
> faults.
> Then the intermingled material rapidly cooled, forming the vesicles
> we see
> now. The massive shock and/or heating would also wipe out the native
> widmanstatten pattern present in the iron body, leaving behind an
> ataxite-like mass without the typical crystallization
> patterns......???
>
> Then this curious mass fell to Earth and experienced weathering/
> alteration
> to provide the strange external appearance we see now.
>
> Or, to play devil's advocate, perhaps this is a very atypical type of
> industrial slag unlike any seen before. Is there any industry
> present in the area where this mass was found?
>
> Best regards,
>
> MikeG
>
> On 2/24/10, Adam Hupe <raremeteorites at yahoo.com> wrote:
>> Very interesting, what are voids (vesicles) doing in an iron
>> meteorite? I have only heard of sparse vugs found in one iron before
>> and thought vesicles would most certainly disqualify an object from
>> being an iron meteorite. Has cosmic ray exposure testing been done?
>> It would be interesting to see how long this object has been in
>> space.
>>
>> Best Regards,
>>
>> Adam
>>
>> ----- Original Message ----
>> From: Michael Johnson <michael at rocksfromspace.org>
>> To: meteorite-list at meteoritecentral.com
>> Sent: Wed, February 24, 2010 8:17:14 AM
>> Subject: [meteorite-list] Rocks from Space Picture of the Day -
>> February 24, 2010
>>
>> http://www.rocksfromspace.org/LOVINA_METEORITE.html
>>
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>
>
> --
> ------------------------------------------------------------
> Mike Gilmer
> http://www.galactic-stone.com
> http://www.facebook.com/galacticstone
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Received on Wed 24 Feb 2010 01:20:15 PM PST