In classification I think there is this: Impact melt breccias = Shock melted rocks with unmelted clasts
Impact melt breccia clasts = Clasts of impact melts with enclosed unmelted debris Impact melt clasts = Fragments solely of impact melt (Ref: http://www.lpi.usra.edu/books/MESSII/9013.pdf) When the term "shock-melt" appears is in the description of components... "there is evidence of shock melt." "the are numerous shock melt veins". Jim On Fri, Apr 26, 2013 at 3:40 AM, <[email protected]> wrote: > I thought SMB and IMB are two abbreviations for the same things. > > Impact is an event, where an shock occurs. And melting shocks are caused by > impacts. And melt breccia is melt with breccia of unmelted or not completely > melted remains. An melt without unmelted or not completely melted remains > should have the name Impact melt. > > Or is my english wrong? > > ----- Original Nachricht ---- > Von: Jim Wooddell <[email protected]> > An: Meteorite List <[email protected]> > Datum: 26.04.2013 04:11 > Betreff: Re: [meteorite-list] Chelyabinsk - IMB or SMB? The nomenclature of > Melts. > >> Hi Mendy, >> I read it in Meteoritics & Planetary Science, Volume 48 Number 3 2013 >> March. >> >> Jim >> >> >> On Thu, Apr 25, 2013 at 5:57 PM, Mendy Ouzillou <[email protected]> wrote: >> > where can one read this paper? >> > >> > Best, >> > >> > >> > Mendy >> > >> > ________________________________ >> > From: Jim Wooddell <[email protected]> >> > To: Meteorite List <[email protected]> >> > Sent: Thursday, April 25, 2013 5:29 PM >> > Subject: Re: [meteorite-list] Chelyabinsk - IMB or SMB? The nomenclature >> of >> > Melts. >> > >> > Hi All! >> > Just a point of information. I just read Dr. Rubin's paper, Multiple >> > melting in a four-layered barred-olivine chondrule with >> > compositionally heterogeneous glass from LL3.0 Semarkona >> > Whew! That's a title for a paper! >> > While we are on the subject of melts, I thought I'd point out this >> > paper. Enjoyed reading it the first time....actually understood some >> > of it and will read it once again after thinking about it for a while. >> > You folks might enjoy reading it when you get a chance! >> > Thanks Alan!! >> > >> > >> > >> > Jim Wooddell >> > >> > >> > On Wed, Apr 24, 2013 at 8:24 PM, Jim Wooddell <[email protected]> >> wrote: >> >> Hi Jeff! >> >> >> >> To me, Impact Melt should mean total melt to liquid...no fragments of >> any >> >> kind. In the case of the classified S4, partial melting occurred, >> >> confirmed by fragments. Still, various flavors understandable >> especially >> >> at >> >> boundaries. >> >> Yep, I think nodules is the keyword that is questionable. Graphite >> >> "nodules" >> >> are found in Canyon Diablo, for example. Once they find large enough >> >> pieces >> >> of this meteorite, they might confirm nodules but they would not be >> >> abnormal >> >> or a special anomaly if they are impact melt. >> >> >> >> Jim >> >> >> >> >> >> >> >> On Wed, Apr 24, 2013 at 7:53 PM, Jeff Kuyken <[email protected]> >> >> wrote: >> >>> >> >>> Definitely IMB although you will find variations within different >> stones. >> >>> Some will be shocked to the point of melt and others will not quite get >> >>> there. Personally I think IMB and SMB are the exact same terms as both >> >>> are >> >>> "melt breccias" and shock is derived from impact. >> >>> >> >>> The official classification of Chely states: "A significant portion >> (1/3) >> >>> of >> >>> the stones consist of a dark, fine-grained impact melt containing >> mineral >> >>> and chondrule fragments." >> >>> >> >>> http://www.lpi.usra.edu/meteor/metbull.php?code=57165 >> >>> >> >>> I personally don't think "nodules" is really the correct terminology >> >>> either. >> >>> They are just individuals / fragments of the same material shocked to a >> >>> higher degree in the parent body. For example... compare it to Gao. We >> >>> don't >> >>> call the IMB pieces, nodules. They are IMB individuals. The term >> >>> "nodules" >> >>> would seem to me to be better reserved for things like "iron nodules" >> in >> >>> a >> >>> stony Mesosiderite or a "Troilite nodule" in an iron meteorite. >> >>> >> >>> Good question Mike. >> >>> >> >>> Cheers, >> >>> >> >>> Jeff >> >>> >> >>> -----Original Message----- >> >>> From: [email protected] >> >>> [mailto:[email protected]] On Behalf Of >> >>> Galactic >> >>> Stone & Ironworks >> >>> Sent: Thursday, 25 April 2013 10:42 AM >> >>> To: Meteorite List >> >>> Subject: [meteorite-list] Chelyabinsk - IMB or SMB? The nomenclature of >> >>> Melts. >> >>> >> >>> 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 >> >>> [email protected] >> >>> http://six.pairlist.net/mailman/listinfo/meteorite-list >> >>> >> >>> >> >>> ______________________________________________ >> >>> >> >>> Visit the Archives at http://www.meteorite-list-archives.com >> >>> Meteorite-list mailing list >> >>> [email protected] >> >>> http://six.pairlist.net/mailman/listinfo/meteorite-list >> >> >> >> >> >> >> >> >> >> -- >> >> Jim Wooddell >> >> [email protected] >> >> 928-247-2675 >> > >> > >> > >> > -- >> > Jim Wooddell >> > [email protected] >> > 928-247-2675 >> > ______________________________________________ >> > >> > Visit the Archives at http://www.meteorite-list-archives.com >> > Meteorite-list mailing list >> > [email protected] >> > http://six.pairlist.net/mailman/listinfo/meteorite-list >> > >> > >> >> >> >> -- >> Jim Wooddell >> [email protected] >> 928-247-2675 >> ______________________________________________ >> >> Visit the Archives at http://www.meteorite-list-archives.com >> Meteorite-list mailing list >> [email protected] >> http://six.pairlist.net/mailman/listinfo/meteorite-list >> > ______________________________________________ > > Visit the Archives at http://www.meteorite-list-archives.com > Meteorite-list mailing list > [email protected] > http://six.pairlist.net/mailman/listinfo/meteorite-list -- Jim Wooddell [email protected] 928-247-2675 ______________________________________________ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
