Abstract
Aqueous alteration is thought to be the earliest chemical reaction in the hydrous asteroids because of their lower reaction temperatures than those of thermal metamorphism. It is important to know the effects of aqueous alteration on materials in primitive asteroids in order to elucidate the history of materials in the early solar system. In this study, we performed an experimental aqueous alteration on primitive carbonaceous chondrite Ningqiang. The results of our experiment indicate that phyllosilicate has formed and the major portion of heavy noble gases could have been lost from primitive asteroids during low-temperature aqueous alteration at the early stage of the solar system evolution.
