COMPOSITION CHARACTERISTICS OF KREEP ROCKS AND UTILIZATION PROSPECT OF REE

KREEP rocks with high contents of K, REE and P were first recognized in Apollo 12 samples, and confirmed later that there were KREEP rock fragments in all of Apollo samples particularly in Apollo-12 and 14 samples. The distribution of KREEP rocks on the lunar surface is very important not only for studying the evolution of the moon, but also for evaluating the utilization prospect of REE in KREEP rocks. Based on previous studies and lunar exploration data, the authors analyse the chemical and mineral characteristics of KREEP rocks, the abundance of Th on lunar surface, the correlation between Th and REE of KREEP rocks in abundance, study the distribution region of KREEP rocks on the lunar surface, and further evaluate the utilization prospect of REE in KREEP rocks.