A fascinating theory. It must be nearly impossible to prove this. I suppose some meteors will need to be isolated before they become meteorites. One would have to examine meteors before they become “contaminated” by the Earth and its atmosphere. Right now, such a thing is the stuff of science fiction.
“One would have to examine meteors before they become ‘contaminated by the Earth...right now, such a thing is the stuff of science fiction.”
Actually not, see the book “Comet” by Carl Sagan and Ann Druyan. We have sent rockets into the tails of several comets, and have a pretty clear idea of the various chemicals that comets are carrying with them, and can deposit on the earth when they crash.