[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 >> >> ______________________________________________ >> Visit the Archives at >> http://www.meteoritecentral.com/mailing-list-archives.html >> Meteorite-list mailing list >> Meteorite-list at meteoritecentral.com >> http://six.pairlist.net/mailman/listinfo/meteorite-list >> >> ______________________________________________ >> Visit the Archives at >> http://www.meteoritecentral.com/mailing-list-archives.html >> Meteorite-list mailing list >> Meteorite-list at meteoritecentral.com >> http://six.pairlist.net/mailman/listinfo/meteorite-list >> > > > -- > ------------------------------------------------------------ > Mike Gilmer > http://www.galactic-stone.com > http://www.facebook.com/galacticstone > ------------------------------------------------------------ > ______________________________________________ > Visit the Archives at > http://www.meteoritecentral.com/mailing-list-archives.html > Meteorite-list mailing list > Meteorite-list at meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list > > ______________________________________________ > Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html > Meteorite-list mailing list > Meteorite-list at meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list Received on Wed 24 Feb 2010 01:20:15 PM PST |
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