Hi List, We keep hearing about the "IMB nodules" that have been recovered - these have an all-black lithology with no chondrules, shock veins, or grey matrix material.
However, these nodules were not created on impact. Had there been such an impact, we would have a visible crater and the nodules would be located in a radius directly adjacent to the crater amidst the ejecta. Instead, these nodules were apparently created during the fragmentation events that took place while the body was still in atmospheric flight. If this is true, shouldn't these nodules be called "shock melt" and not "impact melt" ? Is there any distinction in the official nomenclature between an impact melt and a shock melt? Is it correct to continue using IMB in reference to these Chelyabinsk specimens? Best regards, MikeG -- ------------------------------------------------------------- Web - http://www.galactic-stone.com Facebook - http://www.facebook.com/galacticstone Twitter - http://twitter.com/GalacticStone Pinterest - http://pinterest.com/galacticstone RSS - http://www.galactic-stone.com/rss/126516 ------------------------------------------------------------- ______________________________________________ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
