---- "Sterling K. Webb" <[EMAIL PROTECTED]> wrote: <And all tektites have an original Rb/Sr melt date of 440-480 million years ago. All just a coincidence, of course... >
Where does this information come from? It does not seem even remotely possible. No tektites are this old. All tektites originated as melted terrestrial material. How do you postulate a "melt date" which precedes a later melting? You can't even get a date by backing out the Rb/Sr from the known terrestrial impacted material because the SE Asia impact site is not known. Additionally this means that all tektite forming impacts were L chondrites, no irons, no H chondrites, no carbonaceous etc. This is certainly possible but seems unlikely. Whether a tektite is formed depends on the impacted material and not on the composition of the impactor. -- Eric Olson 7682 Firethorn Dr Fayetteville, NC 28311 http://www.star-bits.com ______________________________________________ http://www.meteoritecentral.com Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
