Abstract:

Meteorite samples would be better preserved in Antarctic ice sheet and hot arid semi arid region. Up to date, meteorite scientists have searched only about 2500km 2 of blue ice and recovered around 15,000 meteorite specimens. More than 2000 meteorite specimens are recovered in Africa, Sahara desert, Western Australia and Roosevelt County(New Mexico and West Texas) desert regions. Differences between the Antarctic meteorites and desert meteorites have been noted since their preservation and climate conditions are different. antarctic meteorites have long terrestrial age, contamination from Earth is smalll and they show remarkable little weathering, in contrast with Antarctic meteorites, desert meteorites have short terrestrial age, contamination from Earth is serious and weathering degree is large. Major meteorite types and their frequency of Antarctic and desert meteorites are similar with modern fall meteorites. The variations of the flux of meteorite types with time are not observed, but abundances of new and unique meteorite types are higher. According to meteorite source we classified these meteorites as asteroid meteorite and planetary meteorite. The study on new and unique meteorite types are useful for understanding continuous chemical fractionation of early solar nebula and horizonal variation of lunar crust and Martian surface.