CompuServe Messages

Hi, Al and folks– Adrian was talking specifically about Thai tektites (and likely all of those from southeast Asia); he mentioned hearing of a NASA study that related their composition to moon rocks. _If_ that was a post-Apollo result (?), a lunar origin for _some_ tektites would still seem to have merit. How are asteroids as sources of silica? With a lunar impact, perhaps part of the asteroid would mix with some of the moon rock and be ejected? Lunar volcanism might be able to sort out a small amount of silica from moon rocks generally poor in such, and preferentially throw the silica out of the Moon's gravity, though this would seem to need more than just a little outgassing. So where are the volcanoes? Could tidal stress really drive such processes? Might a major impact leave a magma reservoir and some true volcanism afterwards? The lunar maria are examples of such a thing, though they are way too old to explain tektites. I wonder if anyone has ever counted craters-within-craters to see if there are more of them than impacts would likely explain. Anyway, I am just fooling around with ideas not to be taken too seriously; my best guess is that some dealers find the old theories sell more tektites. –Doug