Re: [meteorite-list] paper About Tunguska Event Impactor

[Jeff Kuyken]

G'day Paul & List,   >They estimated that the mass of either the comet or carbonaceous asteroid was as large as 103-106 tons.   I find this intriguing as I would have thought that this mass would be no where near large enough to do the damage which was observed at Tunguska. Does a comet/carb asteroid have more energy than an iron asteroid and would it also depend on where or if the mass detonated? I'd be interested to hear opinions on this.   Cheers,   Jeff Kuyken I.M.C.A. #3085 www.meteorites.com.au   ----- Original Message ----- From: Paul H To: [EMAIL PROTECTED] Sent: Thursday, June 24, 2004 3:34 AM Subject: [meteorite-list] paper About Tunguska Event Impactor In the March (2004) issue of Planetary and Space Science, there is a paper discussing the identity of the impactor, which produced the Tunguska Event, that might be of interest to some list members. The paper is: Q. L. Hou , E. M. Kolesnikov , L. W. Xie , N. V. Kolesnikova , M. F. Zhou and M. Sun, 2004, Platinum group element abundances in a peat layer associated with the Tunguska event, further evidence for a cosmic origin. Planetary and Space Science. vol. 52, no. 4, pp. 331-340 doi:10.1016/j.pss.2003.08.002 Based upon "excess" Pd, Rh, Ru, REE, Co, Sr, and Y found in a peat column from the Northern peat bog of the 1908 Tunguska explosion site, they concluded that the impactor, which created the Tunguska event was "more likely a comet", although the possibility that the impactor might have alternatively been a carbonaceous asteroid. They estimated that the mass of either the comet or carbonaceous asteroid was as large as 103-106 tons. I am only reporting what this paper stated. I don't know enough about the pro and cons of the various arguments about the Tunguska event to evaluate their conclusions in any intelligent manner. If anybody needs more information, he or she can find contact information for the authors by clicking the link, "Volume 52, Issue 4, pp. 259-340 (March 2004)" at: http://www.sciencedirect.com/science/journal/00320633 and following the article link to the abstract. (Besides my library doesn't subscribe to Planetary and Space Science. Thus, I only have access to the article's abstract.) Yours, Paul __________________________________ Do you Yahoo!? New and Improved Yahoo! Mail - Send 10MB messages! http://promotions.yahoo.com/new_mail ______________________________________________ Meteorite-list mailing list [EMAIL PROTECTED] http://six.pairlist.net/mailman/listinfo/meteorite-list

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