Re: [meteorite-list] Rocks from Space Picture of the Day - February24, 2010
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 -Ursprüngliche 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 raremeteori...@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 mich...@rocksfromspace.org To: meteorite-list@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@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@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@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@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Rocks from Space Picture of the Day - February24, 2010
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 -Ursprüngliche 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 raremeteori...@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 mich...@rocksfromspace.org To: meteorite-list@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@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@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@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@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@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Rocks from Space Picture of the Day - February24, 2010
Any chance of getting some data on cosmogenic radionuclides in Lovina? I guess that would settle the question about the cosmic origin once and for all. Cheers, Herbert __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
