[meteorite-list] Tektites lunar/terrestrial
From: meteorites_at_space.com <meteorites_at_meteoritecentral.com>
Date: Thu Apr 22 09:43:30 2004 Message-ID: <20010710025725.6125.cpmta_at_c000.snv.cp.net> Joseph, What you left out in your proposition is the impactor itself. If it was say, cometary, then there could be a large component of dust and who knows what kind of solid material. (We have yet to get a really good sample of a comet). Comets are very fragile, and I think that the dymamics of impact for such bodies would be more likely to produce airbursts rather than impacting the ground. Mega Tunguska events if you will. Lots of speculation in the above, but the energy of such is certianly sufficient to reach a temperature where H20 could be broken into its elemental components. As for tektites not having inclusions, I think that you are mistaken on this point-- some do, and these are high pressure silicate minerals. If I recall, it was Dr. John Wasson at UCLA that mentioned this to me. (He is doing reasearch on tektites-- and conveyed to me that virtually all the evidence now gathered points to terrestrial impact origin) Steve Schoner. On Mon, 09 July 2001, "Joseph Hum" wrote: > > <HTML><HEAD> > <META content="text/html; charset=windows-1251" http-equiv=Content-Type> > <META content="MSHTML 5.00.3211.1700" name=GENERATOR></HEAD> > <BODY> > <P> > <DIV></DIV> > <DIV>Howdy! All...</DIV> > <DIV> </DIV> > <DIV>my view on this intriguing subject is that most tektites are lunar</DIV> > <DIV>the reason is that if they are terrestrial what is the parent rock(s)???</DIV> > <DIV>i may be wrong but tektites(at least the half dozen i have) appear to be</DIV> > <DIV>relatively homogeneous, lacking differentiated structures meaning various</DIV> > <DIV>minerals shocked or unshocked, etc. AS many earth rocks do....</DIV> > <DIV>what terrestrial rocks(agglomeration of minerals) would " metamorphically"</DIV> > <DIV>become tektites?? i'm sure we are clever enough to test and simulate </DIV> > <DIV>tempetures, etc. to ascertain the possiblities!</DIV> > <DIV>i personally do not see any terrestrial rocks "transfoming" themselves</DIV> > <DIV>into any type of true tektite !</DIV> > <DIV>tektites are so unlike any other terrestrial rocks and actually are more</DIV> > <DIV>similiar in structure to shale than say obsidian...( a common volcanic glass)...</DIV> > <DIV>the internal structure so lacking in water </DIV> > <DIV>as the moon, does not lend it self to being of terrestrial origin</DIV> > <DIV>moreover, even if the material (larger to start) entered the atmosphere</DIV> > <DIV>at hypervelocities the internal tempeture should not reach the point</DIV> > <DIV>to "dissociate" H2O...from its internal structure as with any meteorite...</DIV> > <DIV>also per one response read something about the "chicken/egg"</DIV> > <DIV>thesis, first of all the chicken/egg paradox is a logical fallacy--</DIV> > <DIV>it's a trick question as "have you stopped beating your wife?</DIV> > <DIV>either way you're damned, because you presume only two possible outcomes</DIV> > <DIV>it may be tektites are both lunar and terrestrial or... or something ELSE</DIV> > <DIV>a weird silicate meteorite.... it doesn't form the "fusion" crust because</DIV> > <DIV>of the nature of the material it popps off when heated...</DIV> > <DIV>also consider lunar meteorites, weird fusion crusts.. brownish/green</DIV> > <DIV>with vesicles!! most meteorites don't display this sort of crust!</DIV> > <DIV> </DIV> > <DIV>that's all for now, Cheers!</DIV> > <DIV> </DIV> > <DIV>Karl(aka Joseph)</DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV> </DIV> > <DIV>--- Karl Hum</DIV> > <DIV>--- <A href="mailto:jkarlhum_at_earthlink.net">jkarlhum@earthlink.net</A></DIV> > <DIV>--- EarthLink: It's your Internet.</DIV> > <DIV> </DIV> > <P></P></BODY></HTML> ___________________________________________________________________ Join the Space Program: Get FREE E-mail at http://www.space.com. Received on Mon 09 Jul 2001 10:57:25 PM PDT |
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