[meteorite-list] deformed etch pattern
From: vincent jacques <meteorh3_6_at_meteoritecentral.com>
Date: Thu Apr 22 10:02:29 2004 Message-ID: <F225HusMjQHtMFaukyC0000d891_at_hotmail.com> <html><div style='background-color:'><DIV> <P>Hello all, </P> <P>You can see a nice Gibeon shocked slice from my collection at </P> <P><U><FONT color=#606420><A href="http://users.skynet.be/meteorite.be/Collection/gibeondeformee.jpg">http://users.skynet.be/meteorite.be/Collection/gibeondeformee.jpg</A></FONT></U></P> <P><A href="http://users.skynet.be/meteorite.be/Collection/gibeondeformee2.jpg">http://users.skynet.be/meteorite.be/Collection/gibeondeformee2.jpg</A><BR></P> <P>I don't know crater for Gibeon, what's the cause of this shock effet?</P> <P>Regards, </P> <P>Vincent<BR></P></DIV> <DIV></DIV> <DIV></DIV>>From: "capricorn89" <CAPRICORN89_at_EARTHLINK.NET> <DIV></DIV>>To: "Bernd Pauli HD" <BERND.PAULI_at_LEHRER1.RZ.UNI-KARLSRUHE.DE>, <GREDFERN@EARTHLINK.NET> <DIV></DIV>>CC: <STARBITS_at_AOL.COM>, <METEORITE-LIST@METEORITECENTRAL.COM> <DIV></DIV>>Subject: Re: [meteorite-list] deformed etch pattern <DIV></DIV>>Date: Sun, 17 Mar 2002 02:32:13 -0800 <DIV></DIV>> <DIV></DIV>>Hi Bernd, <DIV></DIV>> <DIV></DIV>>You might be interested in examining CD16 on my website. <DIV></DIV>>http://home.earthlink.net/~capricorn89/rim.htm <DIV></DIV>>Be sure to click for a full screen image. It is what I call a near rim. It <DIV></DIV>>was found due west, at the bottom of the outer talus from the rim, about <DIV></DIV>>12-15 inches deep, so probably tumbled some distance. Found in a region <DIV></DIV>>which was unusually moist. The crust was like a rustball, but very shallow, <DIV></DIV>>and when cleaned, the interior WILL NOT RUST. This is an ultra-thin slice. <DIV></DIV>>It also was almost impossibly hard to cut. On close examination you will <DIV></DIV>>note slippage plains, and what appears to be several lamella crossing an <DIV></DIV>>intrusive vein, they are, in fact, not related. This is the most unusual CD <DIV></DIV>>I have cut, although I have seen this sort of things among research <DIV></DIV>>specimens, but never any commercially available. <DIV></DIV>> <DIV></DIV>>By the way, I had permission to hunt. This was back when I was a student in <DIV></DIV>>Meteoritics under Dr. Leonard at UCLA. <DIV></DIV>> <DIV></DIV>>Best Wishes, <DIV></DIV>>Ron Hartman <DIV></DIV>>www.meteorite1.com (meteorites) <DIV></DIV>>www.meteorite1.org (membrane boxes) <DIV></DIV>>www.meteorite1.net (cutting, preparation and restoration) <DIV></DIV>> <DIV></DIV>> <DIV></DIV>> <DIV></DIV>> <DIV></DIV>> <DIV></DIV>> <DIV></DIV>> <DIV></DIV>> <DIV></DIV>>----- Original Message ----- <DIV></DIV>>From: Bernd Pauli HD <BERND.PAULI_at_LEHRER1.RZ.UNI-KARLSRUHE.DE> <DIV></DIV>>To: <GREDFERN_at_EARTHLINK.NET> <DIV></DIV>>Cc: <STARBITS_at_AOL.COM>; <METEORITE-LIST@METEORITECENTRAL.COM> <DIV></DIV>>Sent: Sunday, March 17, 2002 2:06 AM <DIV></DIV>>Subject: [meteorite-list] deformed etch pattern <DIV></DIV>> <DIV></DIV>> <DIV></DIV>> > Greg Redfern wrote: <DIV></DIV>> > <DIV></DIV>> > > an unusual etch pattern present in a Canyon Diablo Rim. Contrast <DIV></DIV>> > > the nearly featureless RIM etch pattern with that of an etched <DIV></DIV>> > > "plains" Canyon Diablo specimen. The Rim specimen was subjected <DIV></DIV>> > > to great heat from the impact event which essentially erased the <DIV></DIV>> > > Widmanstätten lines. <DIV></DIV>> > <DIV></DIV>> > <DIV></DIV>> > Hi Greg and List, <DIV></DIV>> > <DIV></DIV>> > An interesting specimen! While the Widmanstätten pattern <DIV></DIV>> > is still recognizable, the bandwidth seems to have been <DIV></DIV>> > "squeezed", the lines are bent, the pattern looks much <DIV></DIV>> > more "diffuse" than the unshocked specimen recovered <DIV></DIV>> > from the surrounding plain. <DIV></DIV>> > <DIV></DIV>> > By the way, Buchwald mentions 7 different alteration stages: <DIV></DIV>> > <DIV></DIV>> > BUCHWALD V.F. (1975) Handbook of Iron Meteorites, Volume 2, pp. 390-397: <DIV></DIV>> > <DIV></DIV>> > 1. Original unshocked material <DIV></DIV>> > 2. Shock-hardened masses <DIV></DIV>> > 3. Shock-annealed masses <DIV></DIV>> > 4. Shock-annealed to recrystallization <DIV></DIV>> > 5. Shock-annealed to alpha2-transformation <DIV></DIV>> > 6. Shock-annealed to alpha2-transformation and <DIV></DIV>> > recrystallization of cohenite and schreibersite <DIV></DIV>> > 7. Partly remelted specimens <DIV></DIV>> > <DIV></DIV>> > Another interesting feature of your "rim specimen" is the small thin <DIV></DIV>> > schreibersite skeleton crystals some of which which are oriented at <DIV></DIV>> > a 90° angle in the middle of the picture. <DIV></DIV>> > <DIV></DIV>> > <DIV></DIV>> > Best Sunday <DIV></DIV>> > morning wishes, <DIV></DIV>> > <DIV></DIV>> > Bernd <DIV></DIV>> > <DIV></DIV>> > ______________________________________________ <DIV></DIV>> > Meteorite-list mailing list <DIV></DIV>> > Meteorite-list_at_meteoritecentral.com <DIV></DIV>> > http://www.pairlist.net/mailman/listinfo/meteorite-list <DIV></DIV>> <DIV></DIV>> <DIV></DIV>>______________________________________________ <DIV></DIV>>Meteorite-list mailing list <DIV></DIV>>Meteorite-list_at_meteoritecentral.com <DIV></DIV>>http://www.pairlist.net/mailman/listinfo/meteorite-list <DIV></DIV></div><br clear=all><hr>MSN Photos est le moyen le plus simple de partager, modifier et imprimer vos photos préférées. <a href='http://g.msn.com/1HM308001/x'>Cliquez ici</a><br></html> Received on Sun 17 Mar 2002 07:20:20 AM PST |
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