AW: [meteorite-list] Shirokovsky

[J�rn Koblitz]

Dear Frederic,   A lot has been written about this "pseudo-pallasite". The most important reports can be found under the following links:   www.meteoriticalsociety.org/bulletin/shirokovsky.pdf http://www.geokhi.ru/~meteorit/shirokovsky1-e.html   Also look into the list archive. There are a lot of postings on this matter.   I think the situation is rather clear: this Shirosovky material has never been in space as:   1. cosmogenic nuclides are virtually absent (must have been a very-very-very large meteoroid not fitting through a 42 cm hole in the ice) 2. noble gas isotopic composition is unlike those of pallasites 3. bulk chemistry is unlike pallasites 4. trace element ratios are rather terrestrial 5. contained olivine crystallized under oxidizing conditions (never heard of asteroid-size parent bodies) 6. cosmic-ray tracks i olivine not present (never seen in pallasites) 7. TL data different from pallasitic olivine (rather terrestrial) 8. oxygen isotopic composition = terrestrial   Putting it together, the strongest evidence against a cosmic origin are points 5 and 8 of the above list.   J�rn     -----Urspr�ngliche Nachricht----- Von: meteoriteshow [mailto:[EMAIL PROTECTED] Gesendet: Dienstag, 6. Juli 2004 10:05 An: Meteorite List Betreff: [meteorite-list] Shirokovsky Dear All,   As I mentioned it about a week ago, Christophe and I attended both Ensisheim and Ste Marie aux Mines shows last month. This year, there was nobody proposing any slice of "Shirokovsky" in Ensisheim, but Mikhail Medvedev from St Petersburg was in Ste Marie, and sold again some slices of this "meteorite". A good friend of mines bought a slice for 200.00 Euros, and was quite ennoyed when he was told later that this is not a meteorite. I know that there was lots of controversial talks about Shirokovsky, but I am not 100% sure of the final position (if any) about it. Could any of you provide some information, I would appreciate. Thanks and kind regards,   Frederic Beroud www.meteoriteshow.com IMCA #2491

______________________________________________
Meteorite-list mailing list
[EMAIL PROTECTED]
http://six.pairlist.net/mailman/listinfo/meteorite-list