In my original post I neglected to add a link to the Hutson paper. Here is the link to the "News" page from the Met. Bull. Database:
http://www.lpi.usra.edu/meteor/MetBullNews.php?id=1 On that MetBull webpage is a link to the Melinda Hutson paper: http://onlinelibrary.wiley.com/doi/10.1111/maps.12062/abstract It was my hope that my post would draw some interest and get more people to read this recent M&PS article. (2013 March, Vol.48 No.3 pg.365) The thrust of my (partial) review was that many long-held assumptions about the Franconia area have been overturned by this paper. Actually, a better phrase would be, "many sacred-cows have been slaughtered". My post was a plea that if you were going to put in print some observation about the Franconia Area, you had better read this paper first. I am in agreement with what is at the heart of Erik's post, so I don't want his point missed because of a technicality with his reference to the Gold Basin Fall. I consider myself as a student of that strewn-field and, although there are many different meteorites found in the Gold Basin AREA, nowhere in the literature has anything other than L4-6 Fa:24±1 been attributed to the Gold Basin fall. Prior to reading this recent paper, I was in complete agreement with Larry about the relative terrestrial age of the L-chondrites, particularly the "fresh-appearing" BM002 & BM003 stones. But that was just another cow-shaped assumption. Terrestrial age-dating for 10 stones from the Franconia Area were presented in this paper, and aside from the lone H6 stone (BM001) all of the L-chondrites dated older than the H-falls. Here is the relative order of falls: 1. BM 001 ~20kyr ago 2. BM 003 ~11kyr ago 3. Palo Verde Mine ~10kyr ago 4. BM 004 ~ 8kyr ago 5. BM 005 ~ 7kyr ago 6. BMW 4.0±0.7kyr ago 7. Franconia "fell recently" Looking forward to hearing from others who have read this article. Have a good night, Bob V. General List Policies: 6. Make sure you can back up statements with -facts and references- --- On Sun, 4/28/13, Mark <mina...@yahoo.com> wrote: > From: Mark <mina...@yahoo.com> > Subject: Re: [meteorite-list] Franconia AREA (was, Re: ...terminology...) > To: "Larry Atkins" <thetop...@aol.com> > Cc: "meteorite-list@meteoritecentral.com" > <meteorite-list@meteoritecentral.com> > Date: Sunday, April 28, 2013, 5:15 PM > > I agree with Eric too, > but not for the different dates that Larry refers to > (which is mentioned in the same article). > After seeing many diverse rock types in a same small rock mass, > I've always felt it's too simplistic to say > different class. = different fall. > > I would go with the dating in this specific case that > indicates different fall events though. > > Sent from my iPod Touch > > > On Apr 28, 2013, at 4:44 PM, Larry Atkins <thetop...@aol.com> > wrote: > > > Eric, > > > > Though I'm not in total agreement with you, > > that is a good point. > > What it comes down to is terrestrial age. > > That would settle it. > > For instance, the L chondrites at Franconia are > > quite obviously from a more recent event, > > I'm certain they are not related., > > they are distinctly different in hand > > and look fresher, and far rarer.. > > > > Almahitta - Sita, among others, says they are not > always homogeneous. You make good points > > > > Sincerely, > > Larry Atkins > > > > IMCA # 1941 > > Ebay alienrockfarm > > > > > > -----Original Message----- > > From: Erik Fisler <phxe...@yahoo.com> > > To: Meteorite List <meteorite-list@meteoritecentral.com> > > Sent: Sun, Apr 28, 2013 7:11 pm > > Subject: Re: [meteorite-list] Franconia AREA (was, Re: > ...terminology...) > > > > > > You mean all those H3-5's are paired?!? Lord. > > > > I think people forget that there are LL's, L's and H's > > found from the Gold Basin fall. > > To say that a mass from a parent body large > > enough to have a strewn field > > of this size and TKW should be one homogeneous > > petro.-type is silly. > > This business of trying to classify every stone as a > > different fall for what > > ever selfish or perverse reason along with having a > > personal attachment to the > > outcome of the over all conclusion is ridiculous and > > completely against the > > scientific method. > > > > How many of those Y[ucca]DCA or what ever H3-5's have been > > found outside the mapped strewn field? And how far? > > > > -Erik Fisler > > > > Sent from my iPhone > > > > On Apr 26, 2013, at 11:02 PM, Robert Verish <bolidecha...@yahoo.com> > wrote: > > > >> Hi All, > >> Just read another article in the 2013 March edition > of M&PS, > >> "Stones from Mohave County, Arizona: > >> Multiple falls in the 'Franconia strewn field' " > >> by Melinda Hutson, et al. > >> > >> There is much to digest from this 5-author paper > >> that is 25 pages long. > >> What with 14 stones being studied and 7 pairings to > >> be described, there is a lot to chew on. > >> > >> Here's something to chew on. According to this paper, > >> "Much unclassified > >> material that has been distributed [sold] as > >> 'Franconia' may not be from the Franconia fall". > >> The authors make a case that > >> more than half of the finds made in the "Franconia area" > >> are paired to the Buck Mountain Wash fall. > >> > >> It has taken 10 years, but these findings show that > >> I was justified in my belly-aching about all of the > >> self-pairing that was occurring back then. > >> It was on this very List that I was strongly criticized > >> for this, and many dealers that thought they knew better > >> defended their God-given right to name their stones > >> after the Franconia meteorite that I got classified. > >> > >> A closer look at the MetBull images for Franconia shows > >> that very few of them are from the Franconia fall. > >> I offer no apologies for taking great satisfaction > >> in the fact that I am now vindicated. > >> > >> The paper goes on to show that every Sacramento Wash > >> numbered meteorite is paired to Buck Mountain Wash, > >> which effectively has resulted in the demise of > >> the SaW DCA and hastened the formation of the Yucca DCA. > >> > >> As I said, if you read this paper, there's a lot > >> more to digest. > >> It's late and I'm thinking about chewing on an antacid pill. > >> > >> -- Bob V. > >> > >> --- On Thu, 4/25/13, Jim Wooddell <jimwoodd...@gmail.com> > wrote: > >> > >>> From: Jim Wooddell <jimwoodd...@gmail.com> > >>> Subject: Re: [meteorite-list] Chelyabinsk - IMB > or SMB? The > > nomenclature of > > Melts. > >>> To: "Meteorite List" <meteorite-list@meteoritecentral.com> > >>> Date: Thursday, April 25, 2013, 5:29 PM > >>> 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 > >> ++++++++++++++ > >> > >> ______________________________________________ > >> > >> 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 > > ______________________________________________ > > > > 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 > > > > ______________________________________________ > > > > 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 > ______________________________________________ > > 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 > ______________________________________________ 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