Asteroidal collisions

Asteroid surface materials: Mineralogical characterizations from reflectance spectra

“…Wetherill (1974) has reviewed the effort in this area. The shock history, cosmic ray exposure age, collisional lifetime, orbital elements and orbital evolution data for meteoritic specimens tend to select or eliminate specific celestial objects as the source bodies of particular meteorites.…”

“…It has been persuasively argued that asteroidal bodies must be the source of at least some of the meteoritic material which arrives at the Earth's surface (e.g., Anders, 1971;Wetherill, 1974 Chapman and Salisbury (1973) and Johnson and Fanale (1973) discussed space weathering as a possible source of mismatch. The problem is compounded by the virtual certainty that the selection of meteoritic matektal arriving at the Earth's surface is both biased and incomplete with respect to the distribution of aster oidal materials (Chapman and Salisbury, 1973;Johnson and Fanale, 1973;McCord and Gaffey, 1974).…”