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Re: Earth meteorites?
fes@UWYO.EDU wrote:
>
> Looking at my last post, I realized it was somewhat off the mark,
> and sort of muddled in ambiguity. I was tring to say that a fusion
> crusted Earth rock is unlikely, NOT impossible, just unlikely, and what
> we see are tektites, due to the force needed to liberate material from
> the planet Earth.
> The physics of impact craters do not really relate impact
> velocity, to the amount of material ejected into space. I have found
> equations relating to ejecta blankets, and boulder piles around crater
> rims, but nothing in way of tektite/Earth meteorite formation. I will
> look harder, and keep all posted on what I find.
> We should not be disuaded by such lacking information, as the
> answer to the question is possibly, simple deduction. For material to be
> ejected into space, it must over come the gravitational field of the body
> it originated on. For Earth, this is 11.5 km/sec, a large number to say
> the least. To visualize this, think of the fuel, and power the Space
> Shuttle produces when it takes off, as it too has to reach the above
> stated speed.
> Lets look at Mars, and the Moon. Mars has an escape velocity of
> 5km/sec, and the Moon has one of 2.3km/sec. If we look at their
> meteorites we see that Mars meteorites suffered an intense shock,
> indicated by the maskylinite found among the minerals. The Moon's
> meteorites have a less severe shocking, and shows only minor alteration.
> An impact would have to be very large and powerful to overcome
> the gravitation of Earth, as most all ejecta fall back in the same area.
> In order to liberate the material from Earth, the force and power would
> create such a heat that it would melt the rock in which the impact
> occured, leaving no unaltered rock to be ejected.
> So the answer to Mr Baalke's question is this: Earth meteorites
> are possible, but improbable, and I have not found any information
> indicating any suspected Earth meteorites. I apologize for the long winded
> answer, and the ambiguities of the previous post. Before I end this
> post, I must say, that I am still looking into this, and may revise the
> above statements.
>
> Frank Stroik
Frank could the be the possibility that tetktites could form when a
meteorite enters the athmosphere and alabates.could the material that
melts out could produce tetktites. And would this not change the cosmic
ray exposure rate by the melting process. Thank Henry Cahill
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